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[Lat. scientia=knowledge]. For many the term science refers to the organized body of knowledge concerning the physical world, both animate and inanimate, but a proper definition would also have to include the attitudes and methods through which this body of knowledge is formed; thus, a science is both a particular kind of activity and also the results of that activity.

The Scientific Method

The scientific method has evolved over many centuries and has now come to be described in terms of a well-recognized and well-defined series of steps. First, information, or data, is gathered by careful observation of the phenomenon being studied. On the basis of that information a preliminary generalization, or hypothesis, is formed, usually by inductive reasoning, and this in turn leads by deductive logiclogic,
the systematic study of valid inference. A distinction is drawn between logical validity and truth. Validity merely refers to formal properties of the process of inference.
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 to a number of implications that may be tested by further observations and experiments (see inductioninduction,
in logic, a form of argument in which the premises give grounds for the conclusion but do not necessitate it. Induction is contrasted with deduction, in which true premises do necessitate the conclusion.
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; deductiondeduction,
in logic, form of inference such that the conclusion must be true if the premises are true. For example, if we know that all men have two legs and that John is a man, it is then logical to deduce that John has two legs.
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). If the conclusions drawn from the original hypothesis successfully meet all these tests, the hypothesis becomes accepted as a scientific theory or law; if additional facts are in disagreement with the hypothesis, it may be modified or discarded in favor of a new hypothesis, which is then subjected to further tests. Even an accepted theory may eventually be overthrown if enough contradictory evidence is found, as in the case of Newtonian mechanics, which was shown after more than two centuries of acceptance to be an approximation valid only for speeds much less than that of light.

Role of Measurement and Experiment

All of the activities of the scientific method are characterized by a scientific attitude, which stresses rational impartiality. Measurementmeasurement,
determination of the magnitude of a quantity by comparison with a standard for that quantity. Quantities frequently measured include time, length, area, volume, pressure, mass, force, and energy.
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 plays an important role, and when possible the scientist attempts to test his theories by carefully designed and controlled experiments that will yield quantitative rather than qualitative results. Theory and experiment work together in science, with experiments leading to new theories that in turn suggest further experiments. Although these methods and attitudes are generally shared by scientists, they do not provide a guaranteed means of scientific discovery; other factors, such as intuition, experience, good judgment, and sometimes luck, also contribute to new developments in science.

Branches of Specialization

Science may be roughly divided into the physical sciences, the earth sciences, and the life sciences. Mathematicsmathematics,
deductive study of numbers, geometry, and various abstract constructs, or structures; the latter often "abstract" the features common to several models derived from the empirical, or applied, sciences, although many emerge from purely mathematical or logical
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, while not a science, is closely allied to the sciences because of their extensive use of it. Indeed, it is frequently referred to as the language of science, the most important and objective means for communicating the results of science. The physical sciences include physicsphysics,
branch of science traditionally defined as the study of matter, energy, and the relation between them; it was called natural philosophy until the late 19th cent. and is still known by this name at a few universities.
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, chemistrychemistry,
branch of science concerned with the properties, composition, and structure of substances and the changes they undergo when they combine or react under specified conditions.
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, and astronomyastronomy,
branch of science that studies the motions and natures of celestial bodies, such as planets, stars, and galaxies; more generally, the study of matter and energy in the universe at large. Ancient Astronomy

Astronomy is the oldest of the physical sciences.
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; the earth sciences (sometimes considered a part of the physical sciences) include geologygeology,
science of the earth's history, composition, and structure, and the associated processes. It draws upon chemistry, biology, physics, astronomy, and mathematics (notably statistics) for support of its formulations.
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, paleontologypaleontology
[Gr.,= study of early beings], science of the life of past geologic periods based on fossil remains. Knowledge of the existence of fossils dates back at least to the ancient Greeks, who appear to have regarded them as the remains of various mythological creatures.
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, oceanographyoceanography,
study of the seas and oceans. The major divisions of oceanography include the geological study of the ocean floor (see plate tectonics) and features; physical oceanography, which is concerned with the physical attributes of the ocean water, such as currents and
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, and meteorologymeteorology,
branch of science that deals with the atmosphere of a planet, particularly that of the earth, the most important application of which is the analysis and prediction of weather.
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; and the life sciences include all the branches of biologybiology,
the science that deals with living things. It is broadly divided into zoology, the study of animal life, and botany, the study of plant life. Subdivisions of each of these sciences include cytology (the study of cells), histology (the study of tissues), anatomy or
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 such as botanybotany,
science devoted to the study of plants. Botany, microbiology, and zoology together compose the science of biology. Humanity's earliest concern with plants was with their practical uses, i.e., for fuel, clothing, shelter, and, particularly, food and drugs.
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, zoologyzoology,
branch of biology concerned with the study of animal life. From earliest times animals have been vitally important to man; cave art demonstrates the practical and mystical significance animals held for prehistoric man.
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, geneticsgenetics,
scientific study of the mechanism of heredity. While Gregor Mendel first presented his findings on the statistical laws governing the transmission of certain traits from generation to generation in 1856, it was not until the discovery and detailed study of the
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, and medicinemedicine,
the science and art of treating and preventing disease. History of Medicine
Ancient Times

Prehistoric skulls found in Europe and South America indicate that Neolithic man was already able to trephine, or remove disks of bone from, the skull
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. Each of these subjects is itself divided into different branches—e.g., mathematics into arithmetic, algebra, geometry, and analysis; physics into mechanics, thermodynamics, optics, acoustics, electricity and magnetism, and atomic and nuclear physics. In addition to these separate branches, there are numerous fields that draw on more than one branch of science, e.g., astrophysics, biophysics, biochemistry, geochemistry, and geophysics.

All of these areas of study might be called pure sciences, in contrast to the applied, or engineering, sciences, i.e., technology, which is concerned with the practical application of the results of scientific activity. Such fields include mechanical, civil, aeronautical, electrical, architectural, chemical, and other kinds of engineeringengineering,
profession devoted to designing, constructing, and operating the structures, machines, and other devices of industry and everyday life. Types of Engineering

The primary types of engineering are chemical, civil, electrical, industrial, and mechanical.
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; agronomy, horticulture, and animal husbandry; and many aspects of medicine. Finally, there are distinct disciplines for the study of the history and philosophy of science.

The Beginnings of Science

Science as it is known today is of relatively modern origin, but the traditions out of which it has emerged reach back beyond recorded history. The roots of science lie in the technology of early toolmaking and other crafts, while scientific theory was once a part of philosophy and religion. This relationship, with technology encouraging science rather than the other way around, remained the norm until recent times. Thus, the history of science is essentially intertwined with that of technology.

Practical Applications in the Ancient Middle East

The early civilizations of the Tigris-Euphrates valley and the Nile valley made advances in both technology and theory, but separate groups within each culture were responsible for the progress. Practical advances in metallurgy, agriculture, transportation, and navigation were made by the artisan class, such as the wheelwrights and shipbuilders. The priests and scribes were responsible for record keeping, land division, and calendar determination, and they developed written language and early mathematics for this purpose. The Babylonians devised methods for solving algebraic equations, and they compiled extensive astronomical records from which the periods of the planets' revolution and the eclipse cycle could be calculated; they used a year of 12 months and a week of 7 days, and also originated the division of the day into hours, minutes, and seconds. In Egypt there were also developments in mathematics and astronomy and the beginnings of the science of medicine. Wheeled vehicles and bronze metallurgy, both known to the Sumerians in Babylonia as early as 3000 B.C., were imported to Egypt c.1750 B.C. Between 1400 B.C. and 1100 B.C. iron smelting was discovered in Armenia and spread from there, and alphabets were developed in Phoenicia.

Early Greek Contributions to Science

The early Greek, or Hellenic, culture marked a different approach to science. The Ionian natural philosophers removed the gods from the personal roles they had played in the cosmologies of Babylonia and Egypt and sought to order the world according to philosophical principles. Thales of Miletus (6th cent. B.C.) was one of the earliest of these and contributed to astronomy, geometry, and cosmology. He was followed by Anaximander, who extended Thales' ideas and proposed that the universe is composed of four basic elements, i.e., earth, air, fire, and water; this theory was also taught by Empedocles (5th cent. B.C.) in Sicily. The philosophers Leucippus and Democritus (both 5th cent. B.C.) held that everything is composed of tiny, indivisible atoms. In the school founded at Croton, S Italy, by the Greek philosopher Pythagoras of Samos (6th cent. B.C.) the principal concept was that of number. The Pythagoreans tried to explain the workings of the universe in terms of whole numbers and their ratios; in addition to contributions to mathematics and philosophy, they also made notable studies in the area of biology and anatomy, e.g., by Alcmaeon of Croton (fl. c.500 B.C.). The most important developments in medicine were made by Hippocrates of Cos (4th cent. B.C.), known as the Father of Medicine, who formulated the science of diagnosis based on accurate descriptions of the symptoms of various diseases. The greatest figures of the earlier Greek period were the philosophers Plato (427–347 B.C.) and Aristotle (384–322 B.C.), each of whom exerted an influence that has extended down to modern times.

Influence of the Alexandrian Schools

The later Greek, or Hellenistic, culture was centered not in Greece itself but in Greek cities elsewhere, particularly Alexandria, Egypt, which was founded in 332 B.C. by Alexander the Great. The so-called first Alexandrian school included Euclid (fl. c.300 B.C.), who organized the axiomatic system of geometry that has served as the model for many other scientific presentations since then; Eratosthenes (3d cent. B.C.), who made a remarkably accurate estimate of the size of the earth; and Aristarchus (3d cent. B.C.), who showed that the sun is larger than the earth and suggested a heliocentric model for the solar system. Archimedes (287–212 B.C.) worked at Syracuse, Sicily, and made contributions to mathematics and mechanics that were surprisingly modern in spirit. The second Alexandrian school flourished in the first centuries of the Christian era, after Rome had become the leading power in the Mediterranean; it included Ptolemy (2d cent. A.D.), who presented the geocentric system of the universe that was to dominate astronomical thought for 1400 years, and his contemporary Heron, who contributed to geometry and pneumatics. Galen (2d cent. A.D.) studied at Pergamum and Alexandria and later practiced medicine and made important anatomical studies at Rome. The Romans assimilated the more practical scientific accomplishments of the Greeks but added relatively little of their own. With the collapse of the Roman Empire in the 5th cent., science ceased to develop in the West.

Scientific Progress in China and India

In the East some accomplishments in science had been made paralleling the early developments in the West. However, although many societies were quick to adopt the fruits of technology, they tended to discourage the development of science on the classical model, which is based on the unbiased interaction of theory and experiment.

In China scientific theories were largely subservient to the main schools of philosophy and theology, particularly those of Confucianism, Taoism, and, later, Buddhism. The agricultural society, which endured until modern times, encouraged the separation of theory and experiment, the former falling to the educated, scholar classes and the latter to the lower, craftsman classes. Astronomy and mathematics were used for practical purposes, such as calendar determination, and there was little interest in theory in these fields. Theories of metallurgy, alchemy, and medicine were all tied to the prevailing religious and philosophical doctrines. Nevertheless, many important practical discoveries were made. Paper was invented in the 2d cent. A.D.; block printing was known in the 7th cent. A.D., with movable clay type by the 11th cent. and cast-metal type in Korea by the beginning of the 15th cent.; gunpowder was invented in the 3d cent. A.D. and firearms were in use by the 13th cent.; and the magnetic compass came into use during the 11th and 12th cent.

In India an alphabetic script was developed, as well as a numeral system based on place value and including a zero; this latter Hindu contribution was adopted by the Arabs and combined with their numeral system. Important Hindu scientists flourished in the 6th and 7th cent. A.D. and also in the 12th cent., making contributions to astronomy and mathematics. Many of these early Indian works showed the influence of Greek science, as in the geocentric systems of astronomy, or of Babylonian science, as in their development of algebraic methods for solving many problems.

Science in the Middle Ages

Muslim Preservation of Learning

With the eclipse of the Greek and Roman cultures, many of their works passed into the hands of the Muslims, who by the 7th and 8th cent. A.D. had extended their influence through much of the world surrounding the Mediterranean. All of the Greek works were translated into Arabic, and commentaries were added. Important developments from the East were also transmitted, and the Hindu numeral system was introduced, as well as the manufacture of paper and gunpowder, learned from the Chinese. Scholars gathered at cities like Damascus, Baghdad, and Cairo, at one end of the Mediterranean, and at Cordova and Toledo, in Spain, at the other end. Many astronomical observations were made at different locations, but there was little effort to improve or modify the Greek model of Ptolemy. In medicine important contributions were made by Al-Razi (Rhazes, 865–925) and Ibn-Sina (Avicenna, 980–1037), and in alchemy and pharmacology by Jabir (Geber, 9th cent.), whose work was expanded in the 10th cent. by a mystical sect aligned with the Sufi tradition. At Cairo, Al-Hazen (965–1038) studied optics, particularly the properties of lenses, and Maimonides (1135–1204), the Jewish philosopher, came there from Spain to practice medicine as physician to Saladin, the Sultan. The Arabs thus preserved the scientific works of the Greeks and added to them, and also introduced other contributions from Asia. This body of learning first began to be discovered by Europeans in the 11th cent.

The Craft Tradition and Early Empiricism in Europe

Certain technical innovations during the Early Middle Ages, e.g., development of the heavy plow, the windmill, and the magnetic compass, as well as improvements in ship design, had increased agricultural productivity and navigation and contributed to the rise of cities, with their craft guilds and universities. These changes were more pronounced in N Europe than in the south. The introduction of papermaking (12th cent.) and printing (1436–50) made possible the recording of craft traditions that had been handed down orally in previous centuries. This served to reduce the gap between the artisan classes and the scholar classes and contributed to the development of certain individuals who combined elements of both traditions—the artist-engineers such as Leonardo da Vinci, whose studies of flight and other technological problems were far beyond their time, and the artist-mathematicians, such as Albrecht Dürer, who examined the laws of perspective and wrote a textbook on geometry. Many artists came to study anatomy in detail.

Beginning in the 12th cent. the Arabic versions of Greek works were translated into Latin, an edition of Ptolemy's Almagest being translated at Toledo, and one of Aristotle's biological works in Sicily. Leonardo da Pisa (Fibonacci) presented some of the new Hindu-Arabic mathematics in the early 13th cent., and the medical and alchemical works were also translated. Also in the 13th cent., a trend toward empiricism was promoted by Roger Bacon and others, but this was short-lived. The dominant philosophy of science and other fields was the Christianized version of Aristotelian philosophy created by Albertus Magnus and Thomas Aquinas in the 13th cent. This view tended to treat scientific theories as extensions of philosophy and, for example, postulated the existence of angelic agents to account for the movements of the heavenly bodies. Even so, the craft traditions continued to develop in an independent manner, particularly medieval alchemy, and certain schools grew up that were not dominated by the main scholastic philosophy. The rebirth, or RenaissanceRenaissance
[Fr.,=rebirth], term used to describe the development of Western civilization that marked the transition from medieval to modern times. This article is concerned mainly with general developments and their impact in the fields of science, rhetoric, literature, and
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, of learning spread throughout the West from the 14th to the 16th cent. and was further enhanced by the great voyages of discovery that began in the 15th cent.

The Scientific Revolution

Science, in the modern sense of the term, came into being in the 16th and 17th cent., with the merging of the craft tradition with scientific theory and the evolution of the scientific method. The feeling of dissatisfaction with the older philosophical approach had begun much earlier and had produced other results, such as the Protestant Reformation, but the revolution in science began with the work of Copernicus, Paracelsus, Vesalius, and others in the 16th cent. and reached full flower in the 17th cent.

The Rejection of Traditional Paradigms

Copernicus broke with the traditional belief, supported by both scientists and theologians, that the earth was at the center of the universe; his work, finally published in the year of his death (1543), proposed that the earth and other planets move in circular orbits around the sun. Paracelsus rejected the older alchemical and medical theories and founded iatrochemistry, the forerunner of modern medical chemistry. Andreas Vesalius, like Paracelsus, turned away from the medical teachings of Galen and other early authorities and through his anatomical studies helped to found modern medicine and biology. The philosophical basis for the scientific revolution was expressed in the writings of Francis Bacon, who urged that the experimental method plays the key role in the development of scientific theories, and of René Descartes, who held that the universe is a mechanical system that can be described in mathematical terms. The science of mechanics was established by Galileo, Simon Stevin, and others. The astronomical system of Copernicus gained support from the accurate observations of Tycho Brahe; the modification of Johannes Kepler, who used Tycho's work to show that the planetary orbits are elliptical rather than circular; and the writings of Galileo, who based his arguments on his own mechanical theories and observations with the newly invented telescope. Other instruments were also of major importance in the discoveries of the scientific revolution. The microscope extended human knowledge of living things just as the telescope had extended human knowledge of the heavens. The mechanical clock was perfected in the late 16th cent. by Christian Huygens, who also made improvements in the telescope, and thus events, both celestial and terrestrial, could be timed with greater precision—an essential factor in the development of the exact sciences, such as mechanics. The 17th cent. also saw the discovery of the circulation of the blood by William Harvey and the founding of modern chemistry by Robert Boyle.

Improved Communication of Scientific Knowledge

Another important factor in the scientific revolution was the rise of learned societies and academies in various countries. The earliest of these were in Italy and Germany and were short-lived. More influential were the Royal Society in England (1660) and the Academy of Sciences in France (1666). The former was a private institution in London and included such scientists as Robert Hooke, John Wallis, William Brouncker, Thomas Sydenham, John Mayow, and Christopher Wren (who contributed not only to architecture but also to astronomy and anatomy); the latter, in Paris, was a government institution and included as a foreign member the Dutchman Huygens. In the 18th cent. important royal academies were established at Berlin (1700) and at St. Petersburg (1724). The societies and academies provided the principal opportunities for the publication and discussion of scientific results during and after the scientific revolution.

The Impact of Sir Isaac Newton

The greatest figure of the scientific revolution, Sir Isaac NewtonNewton, Sir Isaac,
1642–1727, English mathematician and natural philosopher (physicist), who is considered by many the greatest scientist that ever lived. Early Life and Work
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, was a fellow of the Royal Society of England. To earlier discoveries in mechanics and astronomy he added many of his own and combined them in a single system for describing the workings of the universe; the system is based on the concept of gravitation and uses a new branch of mathematics, the calculus, that he invented for the purpose. All of this was set forth in his Philosophical Principles of Natural Philosophy (1687), the publication of which marked the beginning of the modern period of mechanics and astronomy. Newton also discovered that white light can be separated into a spectrum of colors, and he theorized that light is composed of tiny particles, or corpuscles, whose behavior can be described by the laws of mechanics. A rival theory, holding that light is composed of waves, was proposed by Huygens about the same time. However, Newton's influence was so great and the acceptance of the mechanistic philosophy of Descartes and others so widespread that the corpuscular philosophy was the dominant one for more than a century.

The Age of Classical Science

The history of science during the 18th and 19th cent. is largely the history of the individual branches as they developed into the traditional forms by which they are still recognized today.

The Evolution of Mathematics and Physics

In mathematics the calculus invented by Newton and G. W. Leibniz was developed by the Bernoullis, Leonhard Euler, and J. L. Lagrange into a powerful tool that was to be used not only in mathematics but also in physics and astronomy. Newtonian physics spread to the Continent slowly, its acceptance being hindered by adherents of the older Cartesian philosophy and by disputes over priority in the invention of the calculus. However, by the late 18th cent. it was firmly established. Other branches of physics came into their own during this period. The study of electricity expanded to include electric currents and magnetism, and it was finally synthesized in the theory of electromagnetic radiation of J. C. Maxwell in the second half of the 19th cent. These discoveries provided the foundation for the technological advances in communications and in other fields using electrical energy. The wave theory of light was revived at the beginning of the 19th cent. by Thomas Young and developed by others; Maxwell's theory showed that light was one form of electromagnetic energy. In the 18th cent. scientists thought that heat was a kind of fluid called caloric. However, by the early 19th cent. it became apparent that heat is a form of motion—the motion of the particles of which substances are composed. The classical theory of heat and thermodynamics was developed by J. P. Joule, Lord Kelvin, R. J. E. Clausius, and others, who showed the relation between heat and other forms of energy and formulated the law of conservation of energy. Maxwell, Ludwig Boltzmann and others developed statistical mechanics, which treats matter as a large aggregate of many particles and applies statistical methods to the prediction of its behavior.

Innovations in Chemistry

Chemistry became increasingly quantitative and experimental during the 18th cent. Joseph Priestley and other English scientists made a number of discoveries which served as the basis for A. L. Lavoisier's explanation of the role of oxygen in combustion and respiration. John Dalton proposed the modern version of the atomic theory in the early 19th cent. and Dmitri Mendeleev, in his periodic table, showed how the chemical elements described by the atomic theory could be arranged in a systematic way. In the mid-19th cent. R. W. Bunsen and G. R. Kirchhoff developed spectroscopy as a tool for chemical analysis. Also in the 19th cent., the synthesis of urea by Friedrich Wöhler (1828) established that organic substances are composed of the same kinds of atoms as inorganic substances, thus opening a new era in the study of organic chemistry.

Advances in Astronomy

Astronomy progressed on the theoretical level through the contributions to celestial mechanics of P. S. Laplace and others, and on the observational level through the work of many scientists. They included William Herschel, who built telescopes and discovered Uranus (1781), the first planet found in modern times, and his son John Herschel, who extended his father's observations to the Southern Hemisphere skies and pioneered in astrophotography, which in modern astronomy is the chief method of observation. Another tool that found important application in astronomy was the spectroscope. Increasingly astronomers made use of the instruments, techniques, and theories of other fields, particularly physics.

Birth of Modern Geology

Modern geology may be said to date from the work of James Hutton, who postulated (1785) that the geologic processes and forces that had shaped the earth were still in operation and could be observed directly. Georges Cuvier, the French naturalist, founded the field of comparative anatomy and applied its principles to geology in the study of the fossil remains of animals of the distant past, thus also founding the field of paleontology.

New Ideas in Biology

In biology Carolus Linnaeus instituted a system of classification of animals and plants, and improvements in this system helped scientists to arrange different forms of life according to complexity, suggesting to some that organisms may evolve from simple to complex forms. In the 19th cent. K. E. von Baer founded the field of embryology, the study of the earliest stages of different forms of life, and Matthias Schleiden and Theodor Schwann identified the cell as the basic unit of living matter. In medicine the treatment of disease was furthered by the introduction of smallpox vaccination by Edward Jenner and the recognition of the role of germs and viruses in causing diseases. A number of ways of reducing the growth of such organisms were introduced, including pasteurization of foods and antiseptic surgery. Anesthetics were introduced in the 19th cent. by several scientists, and, through chemistry, new medications were developed that aimed at treatment of specific ailments.

Science and the Industrial Revolution

Some of the greatest changes were in the area of technology, in the development of new sources of energy and their application in transportation, communications, and industry. Among the important aspects of the Industrial RevolutionIndustrial Revolution,
term usually applied to the social and economic changes that mark the transition from a stable agricultural and commercial society to a modern industrial society relying on complex machinery rather than tools.
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 were the invention of the steam engine by James Watt and its use in factories, mines, ships, and railroad engines; the development of the internal-combustion engine and the companion growth of petroleum technology to provide fuel for it; the invention of many different kinds of agricultural machinery and the resulting enormous increase in productivity; the improvement of many metallurgical processes, particularly those involving iron and steel; and the invention of the electric generator, electric motor, and numerous electric devices that are now commonplace.

Revolutions in Modern Science

The enormous growth of science during the classical period engendered an optimistic attitude on the part of many that all the major scientific discoveries had been made and that all that remained was the working out of minor details. Faith in the absolute truth of science was in some ways comparable to the faith of earlier centuries in such ancient authorities as Aristotle and Ptolemy. This optimism was shattered in the late 19th and early 20th cent. by a number of revolutionary discoveries. These in turn attracted increasing numbers of individuals into science, so that whereas a particular problem might have been studied by a single investigator a century ago, or by a small group of scientists a few decades ago, today such a problem is attacked by a virtual army of highly trained, technically proficient scholars. The growth of science in the 20th cent. has been unprecedented.

In much of modern science the idea of progressive change, or evolution, has been of fundamental importance. In addition to biological evolution, astronomers have been concerned with stellar and galactic evolution, and astrophysicists and chemists with nucleosynthesis, or the evolution of the chemical elements. The study of the evolution of the universe as a whole has involved such fields as non-Euclidean geometry and the general theory of relativity. Geologists have discovered that the continents are not static entities but are also evolving; according to the theory of plate tectonics, some continents are moving away from each other while others are moving closer together.

The Impact of Elementary Particles

Physics in particular was shaken to the core around the turn of the century. The atom had been presumed indestructible, but discoveries of X rays (1895), radioactivity (1896), and the electron (1897) could not be explained by the classical theories. The discovery of the atomic nucleus (1911) and of numerous subatomic particles in addition to the electron opened up the broad field of atomic and nuclear physics. Atoms were found to change not only by radioactive decay but also by more dramatic processes—nuclear fission and fusion—with the release of large amounts of energy; these discoveries found both military and peaceful applications.

Quantum Theory and the Theory of Relativity

The explanation of atomic structure required the abandonment of older, commonsense, classical notions of the nature of space, time, matter, and energy in favor of the new view of the quantum theory and the theory of relativity. The first of these two central theories of modern physics was developed by many scientists during the first three decades of the 20th cent.; the latter theory was chiefly the product of a single individual, Albert Einstein. These theories, particularly the quantum theory, revolutionized not only physics but also chemistry and other fields.

Advances in Chemistry

Knowledge of the structure of matter enabled chemists to synthesize a sweeping variety of substances, especially complex organic substances with important roles in life processes or with technological applications. Radioactive isotopes have been used as tracers in complicated chemical and biochemical reactions and have also found application in geological dating. Chemists and physicists have cooperated to create many new chemical elements, extending the periodic table beyond the naturally occurring elements.

Biology Becomes an Interdisciplinary Science

In biology the modern revolution began in the 19th cent. with the publication of Charles Darwin's theory of evolution (1859) and Gregor Mendel's theory of genetics, which was largely ignored until the end of the century. With the work of Hugo de Vries around the turn of the century biological evolution came to be interpreted in terms of mutations that result in a genetically distinct species; the survival of a given species was thus related to its ability to adapt to its environment through such mutations. The development of biochemistry and the recognition that most important biological processes take place at the molecular level led to the rapid growth of the field of molecular biology, with such fundamental results as the discovery of the structure of deoxyribonucleic acid (DNA), the molecule carrying the genetic code. Modern medicine has profited from this explosion of knowledge in biology and biochemistry, with new methods of treatment ranging from penicillin, insulin, and a vast array of other drugs to pacemakers for weak hearts and implantation of artificial or donated organs.

The Abstraction of Mathematics

In mathematics a movement toward the abstract, axiomatic approach began early in the 19th cent. with the discovery of two different types of non-Euclidean geometries and various abstract algebras, some of them noncommutative. While there has been a tendency to consolidate and unify under a few general concepts, such as those of group, set, and transformation, there has also been considerable research in the foundations of mathematics, with a close examination of the nature of these and other concepts and of the logical systems underlying mathematics.

Astronomy beyond the Visual Spectrum

In astronomy ever larger telescopes have assisted in the discovery that the sun is a rather ordinary star in a huge collection of stars, the Milky Way, which itself is only one of countless such collections, or galaxies, that in general are expanding away from each other. The study of remote objects, billions of light-years from the earth, has been carried out at all wavelengths of electromagnetic radiation, with some of the most notable results being made in radio astronomy, which has been used to map the Milky Way, study quasars, pulsars, and other unusual objects, and detect relatively complex organic molecules floating in space. The latter, coupled with the discovery of extrasolar planetary systems and possible microscopic fossils in meteorites of Martian origin, have raised new questions about the origin of life and the possible existence of intelligent life elsewhere in the universe.

Modern Science and Technology

The technological advances of modern science, which in the public mind are often identified with science itself, have affected virtually every aspect of life. The electronics industry, born in the early 20th cent., has advanced to the point where a complex device, such as a computer, that once might have filled an entire room can now be carried in an attaché case. The electronic computer has become one of the key tools of modern industry. Electronics has also been fundamental in developing new communications devices (radio, television, laser). In transportation there has been a similar leap of astounding range, from the automobile and the early airplane to the modern supersonic jet and the giant rocket that has taken astronauts to the moon. Perhaps the most overwhelming aspect of modern science is not its accomplishments but its magnitude in terms of money, equipment, numbers of workers, scope of activity, and impact on society as a whole. Never before in history has science played such a dominant role in so many areas.

Promise and Problems of Modern Science

Modern science holds out a number of promises, as well as a number of problems. In the foreseeable future researchers may solve the riddle of life and create life itself in a test tube. Most diseases may be brought under control. Science is also working toward control over the environment, e.g., dispersing hurricanes before they can endanger life or property. New sources of energy are being developed, and these together with the capacity to manipulate alien environments may make life possible on the moon or other planets.

Among the challenges faced by modern science are practical ones such as the production and distribution of enough energy to meet increased demands and the elimination or reduction of pollutants in the environment. Some of these problems are political and sociological as well as scientific, as are such problems as control over nuclear and other forms of weapons (biological, chemical) and regulation of the use of computers and other electronic devices that may seriously infringe on individual privacy and freedom. Some have profound ethical implications, e.g., those associated with gene manipulation, organ transplantation, and the capacity to sustain life beyond the point at which it once would have ended. There are also philosophical problems raised by science, as in the uncertainty principle of the quantum theory, which places an absolute limit on the accuracy of certain physical measurements and thus on the predictions that may be made on the basis of such measurements; in the quantum theory itself, with its suggestion that at the atomic level much depends on chance; and in certain paradoxical discoveries in mathematics and mathematical logic. Even a detailed account of the history of science cannot be complete, for scientific activity is not isolated but takes place within a larger matrix that also includes, for example, political and social events, developments in the arts, philosophy, and religion, and forces within the life of the individual scientist. In other words, science is a human activity and is affected by all that affects human beings in any way.


See H. Poincaré, Science and Hypothesis (1902, tr. 1905, repr. 1952); J. Bronowski, The Common Sense of Science (1953); E. Nagel, The Structure of Science (1961); A. Koyré, Metaphysics and Measurement (1968); G. Sarton, Introduction to the History of Science (3 vol., 1927–48; repr. 1968); B. Commoner, Science and Survival (1966, repr. 1969); N. R. Hanson, Perception and Discovery: An Introduction to Scientific Inquiry (1969); J. Monod, Chance and Necessity (tr. 1971); L. P. Williams and H. J. Steffens, The History of Science in Western Civilization (3 vol., 1978–79); C. A. Ronan, Science (1982); J. Ziman, An Introduction to Science Studies (1985); T. S. Kuhn, The Structure of Scientific Revolutions (3d ed. 1996); L. Jardine, Ingenious Pursuits: Building the Scientific Revolution (1999); D. Teresi, Lost Discoveries: The Ancient Roots of Modern Science (2002); J. al-Khalili, The House of Wisdom: How Arabic Science Saved Ancient Knowledge and Gave Us the Renaissance (2011); D. Knight, Voyaging in Strange Seas: The Great Revolution in Science (2014); D. Wootton, The Invention of Science (2015). See also R. J. Blackwell, ed., A Bibliography of the Philosophy of Science, 1945–1981 (1983).


  1. (most general sense) any systematic study of physical or social phenomena.
  2. (more restricted sense) the study of physical and social phenomena where this involves observation, experiment, appropriate quantification and the search for universal general laws and explanations.
  3. any specific branch of knowledge in either of the above senses (e.g. social science) (compare IDEOLOGY, MAGIC, RELIGION).
In sociology, and elsewhere, debate about science 2 centres on the extent to which it is necessary or possible to arrive at a strict definition of'science’, and at how far any definition which might be appropriate for the physical sciences is also appropriate for the social sciences, with their extra source of corrigibility for any generalizations proposed, namely human choice and the inherent fluidity of social action.

The general problems in the definition and identification of science 2 have increased recently as the result of a critical assault on conventional philosophies of knowledge and of science. Problems have arisen especially from the work of KUHN (1962) in which science is seen as the product of multiple perspectives and numerous groups and schools (see SCIENTIFIC PARADIGM) without any single identifiable set of procedures or identifying criteria making it possible to demarcate science as a whole. Neither POSITIVISM nor FALSIFICATIONISM, two previous main attempts to provide a ‘criterion of demarcation’ of science 2 , today find unreserved support (see also COVERING-LAW MODEL, SCIENTIFIC REALISM).

A widespread view is that, rather than being identifiable as a single pure form, science must now be seen as involving a complex process of social production, working upon and transforming previously existing knowledge, but with no single scientific method or straightforward distinction between science 2 and other forms of knowledge. As a socially located phenomenon, science must also be recognized as occurring in a context in which the cultural values and interests of scientists, and also the wider interests served by science, are always a potential influence on the knowledge produced (see also SOCIOLOGY OF SCIENCE, SOCIOLOGY OF KNOWLEDGE, OBJECTIVITY).

Some commentators have suggested that the only epistemological position now tenable is to recognize the inevitable relativity of scientific knowledge (see EPISTEMOLOGY, RELATIVISM). However, a return to broadly philosophical criteria for the identification of the ‘truth’ of hypotheses and theories remains possible. For example. HABERMAS (1970a & b) and FEYERABEND (1978) propose a ‘consensus’ or unrestricted discourse model of the conditions for knowledge. This sees the search for truth as requiring conditions which allow ‘open discourse’ on whatever evidence is offered in support of particular hypotheses, with the aim of arriving at a ‘warranted consensus’. Current thinking on science, however, leaves the identification of'science’ as against ‘nonscience’ (e.g. compared with ideology) a much more open question than hitherto.



the field of human endeavor that elaborates and theoretically systematizes objective knowledge of reality; one of the forms of social consciousness. In the course of historical development science becomes a productive force in society and a highly important social institution. The concept of science includes both activity aimed at gaining new knowledge and the result of such activity—the sum of the scientific knowledge acquired up to a given time, which constitutes the scientific conception of the world. The term “science” is also used to designate the various branches of scientific knowledge.

The immediate goals of science are to describe, explain, and predict processes and phenomena of reality employing the laws that science has discovered. In the broad sense, science aims at the theoretical representation of reality.

Science and other ways of apprehending reality. Inseparable from the practical way of comprehending the world, science as the creation of knowledge is a specific form of activity that differs significantly both from physical production and from other types of mental activity. Whereas in physical production knowledge is used only as an ideal means, in science the acquisition of knowledge constitutes the primary and direct goal, regardless of the form that the goal takes—whether the goal be a theoretical description, the flow charts of an industrial process, a summary of experimental data, or the formula of a preparation. Unlike those types of endeavor whose result is known in advance, before the activity begins, scientific work is scientific because it creates new knowledge—its result is fundamentally nontraditional. It is precisely for this reason that science acts as a force that continually revolutionizes other types of activity.

In contrast to the aesthetic (artistic) way of comprehending reality, as embodied in art, science strives for impersonal, objective knowledge that is generalized to the fullest possible extent; in art the results of artistic cognition are inseparable from the unique personal element. Art is often described as “thinking in images” and science as “thinking in concepts,” emphasizing that the former develops chiefly the sensory and imaginal aspect of man’s creative capacity, whereas the latter deals primarily with the intellectual and conceptual aspect. These differences, however, do not constitute an insurmountable barrier between science and art, which are linked by their creative and cognitive attitude toward reality. On the one hand, the aesthetic element often plays a significant role in scientific constructs, especially in the development of a theory, in a mathematical formula, or in the plan or idea for an experiment. The presence of the aesthetic element has been noted by many scientists. On the other hand, artistic works have a cognitive, as well as an aesthetic aspect. For example, K. Marx’ first insight into the socioeconomic nature of money in bourgeois society was based, in particular, on an analysis of the works of Goethe and Shakespeare (K. Marx and F. Engels, Iz rannikh proizv., 1956, pp. 616–20).

The relationship between science and philosophy as specific forms of social consciousness is complex. To some extent philosophy always provides science with a methodology of cognition and interprets its discoveries in terms of a world view. Philosophy and science are also linked by a common striving to present knowledge in a theoretical form and by a desire for logical proof. This striving reaches its highest fulfillment in dialectical materialism—a philosophy that consciously and openly allies itself with science and with the scientific method. Dialectical materialism studies the most general laws of the development of nature, society, and thought, relying on the findings of science.

Because of the direct relation between philosophy and Weltanshauung, in a society of antagonistic classes various philosophical schools relate differently to science and to the methods that it uses to arrive at knowledge. Some philosophical schools view science skeptically (for example, existentialism) or even with open hostility, whereas others attempt to dissolve philosophy in science (positivism), thereby disregarding philosophy’s function in shaping a world view. Only Marxism-Leninism gives a consistent solution to the problem of the relationship between philosophy and science. It adopts scientific methods and makes full use of scientific discoveries, at the same time taking into account the specific nature of the subject matter under study and the social role of philosophy. This makes Marxism-Leninism a truly scientific philosophy. Through philosophy and the general theory of the social sciences, all science is related to ideology and politics. Whenever class antagonisms are present this relationship accounts for the class character and partiihost’ (party-mindedness) of the social sciences, which border on philosophy, and for the important role of the natural sciences in shaping a world view.

Science, which is oriented toward the criteria of reason, has been the antithesis of religion, which rests on faith in the supernatural. Whereas science studies reality by means of reality itself and requires rational substantiation and practical confirmation of the knowledge derived, religion sees its main strength in revelation and in appeals to suprarational arguments and to the indisputable authority of canonical texts. In the modern world, however, religion has had to contend with the tremendous progress in science and the growth of its social role, and therefore it is vainly trying to find some way of reconciling its doctrine with scientific truths or even of adapting them to its own needs.

Principal stages in the development of science. Science originated in the practical experience of early human societies, in which the cognitive and productive aspects were fused. “The production of ideas, of conceptions, and of consciousness is at first directly interwoven with the material activity and the material intercourse of men, the language of real life. Conceiving, thinking, the mental intercourse of men appear at this stage as the direct efflux of their material behavior” (K. Marx and F. Engels, Feierbakh: Protivopolozhnost’ materialisticheskogo i idealisticheskogo vozzrenii, 1966, p. 29).

Initially, knowledge was practical, serving as a methodological guide to specific kinds of human activity. A great deal of knowledge of this type, constituting an important prerequisite for future science, was gathered in the ancient East (Babylonia, Egypt, India, China). Mythology, the first attempt to create an integrated, all-embracing system of concepts about surrounding reality, may be regarded as a remote prerequisite for science. These concepts were, however, far removed from science because of their religious and anthropomorphic character. Moreover, the criticism and destruction of mythological systems were preconditions for the emergence of science. Certain social conditions were also necessary for the rise of science—a sufficiently high level of development of production and social relations (resulting in the division of mental and physical labor and thereby making possible systematic scientific work) and a rich and broad cultural tradition permitting free assimilation of the achievements of different cultures and peoples.

These conditions had emerged by the sixth century B.C. in ancient Greece, where the first theoretical systems explaining reality in terms of natural principles (unlike mythology) were proposed by Thales, Democritus, and other thinkers. Having detached itself from mythology, nature philosophy at first syncretically combined science and the most speculative variants of philosophy. Nonetheless, this nature philosophy represented theoretical knowledge in which objectivity and logical persuasiveness were primary. Ancient Greek science, as represented by Aristotle and other thinkers, offered the first descriptions of the laws of nature, society, and thought, which, although imperfect, played a major role in the history of culture. These descriptions of laws introduced into cognitive activity a system of abstract concepts pertaining to the world as a whole. They firmly established the tradition of searching for objective, natural laws of the universe and laid the groundwork for the demonstrative method of presenting material, the most important aspect of science. At this time various branches of knowledge began to detach themselves from nature philosophy. The Hellenistic period of ancient Greek science saw the creation of the first theoretical systems in geometry (Euclid), mechanics (Archimedes), and astronomy (Ptolemy).

During the Middle Ages scholars of the Arab East and Middle Asia, notably Avicenna, Averroes, and al-Biruni, made an important contribution to the development of science by preserving the ancient Greek tradition and enriching it in a number of fields. In Europe the classical tradition was greatly transformed under the domination of the Christian religion, which shaped the characteristic medieval form of science—Scholasticism. Subordinate to religion, Scholasticism dealt primarily with the elaboration of Christian dogma; nevertheless, it made a significant contribution to the development of thought and to the art of theoretical debate. The development of alchemy and astrology also helped lay the foundation for science in the modern sense: alchemy established the tradition of the experimental study of natural substances and compounds, thus paving the way for chemistry, and astrology stimulated systematic observation of celestial bodies, thereby promoting the development of an experiential base for astronomy.

Science in the modern sense emerged in the 16th and 17th centuries to meet the needs of developing capitalist production. Apart from past traditions, two circumstances contributed to the rise of science. First, the domination of religious thought was undermined during the Renaissance, and the opposing conception of the world that evolved rested on scientific data. Science became an independent factor in intellectual life and the basis for a world view (Leonardo da Vinci, N. Copernicus). Second, in addition to observation, modern science introduced experimentation, which became the basic method of research and greatly expanded the scope of knowable reality by combining theoretical reasoning with a practical “testing” of nature. As a result, the cognitive capacity of science increased sharply. This profound transformation of science in the 16th and 17th centuries was the first scientific revolution, dominated by such figures as Galileo, J. Kepler, W. Harvey, R. Descartes, C. Huygens, and I. Newton.

As the pace of scientific progress quickened and as science assumed the dominant position in the emerging new conception of the world, scientific knowledge became a higher cultural value toward which most philosophical schools and movements oriented themselves. In the study of social phenomena, this reorientation was manifested in a search for the “natural principles” of religion, law, and morality, based on the concept of “human nature” (H. Grotius, B. Spinoza, T. Hobbes, J. Locke). As the bearer of the “light of reason,” science was regarded as the sole antithesis of all the evils of society, whose transformation would be possible only through enlightenment. “Thinking reason became the sole measure of all that exists” (F. Engels, in K. Marx and F. Engels, Soch., 2nd ed., vol. 20, p. 16).

The advances in mechanics, whose basic principles had been systematized and fully developed by the end of the 17th century, played a decisive role in the emergence of the mechanistic conception of the world, which soon became a universal world view (L. Euler, M. V. Lomonosov, P. Laplace). Not only physical and chemical phenomena, but also biological phenomena were perceived mechanistically, for example, the view of man as an integral organism (La Mettrie’s “man as a machine”). The ideals of mechanistic natural science became the basis for a theory of knowledge and for the study of scientific methods, which developed rapidly in this period. Philosophical doctrines concerning human nature, society, and the state arose in the 17th and 18th centuries as branches of the general doctrine of a unified world mechanism.

The reliance of modern science on experiments and the development of mechanics permitted the establishment of a link between science and production, although this link became permanent and systematic only in the late 19th century.

By the early 19th century a large body of material pertaining to various aspects of reality had been amassed, systematized, and theoretically substantiated on the basis of the mechanistic world view. It became increasingly apparent, however, that this material did not fit within the framework of a mechanistic explanation of nature and society and required a new, more profound, and broader synthesis that would encompass the results obtained by different sciences. The discovery of the law of the conservation and conversion of energy by R. Mayer, J. Joule, and H. Helmholtz made it possible to place chemistry and all branches of physics on a common ground. The cell theory, developed by T. Schwann and M. Schleiden, demonstrated the uniform structure of all living organisms. Darwin’s evolutionary theory in biology introduced the idea of development into natural science. The periodic table of the elements worked out by D. I. Mendeleev proved the existence of an intrinsic relation between all known types of matter. In the mid-19th century the socioeconomic, philosophical, and general scientific foundations were laid for a scientific theory of social development, which was created by the founders of Marxism. Marx and Engels revolutionized the social sciences and philosophy, making it possible to create a methodological base for a group of sciences dealing with society. A new stage in the history of social science began with V. I. Lenin, who developed all aspects of Marxism in a new historical era.

Major changes in scientific thought and a number of new discoveries in physics (such as the electron and radioactivity precipitated a crisis in modern classical science at the turn of the century and caused the collapse of its philosophical and methodological foundation—the mechanistic world view. The essence of this crisis was revealed by Lenin in his Materialism and Empiriocriticism. The crisis was resolved by another scientific revolution, which began in physics (M. Planck, A. Einstein) and subsequently encompassed all the main branches of science.

The convergence of science and production in the latter half of the 19th century stimulated collaborative scientific work, requiring new organizational forms. Twentieth-century science is closely bound up with technology, is increasingly becoming a direct productive force in society, is expanding its contact with all spheres of social life, and is assuming a greater social role. Contemporary science is the most important component, the moving force, of the scientific and technological revolution. The “points of growth” of 20th-century science have generally occurred when the internal logic of its development has coincided with the increasingly diverse social requirements imposed by modern society. By the mid-20th century, biology occupied a prominent position in natural science owing to such fundamental discoveries as the molecular structure of DNA (F. Crick and J. Watson) and the genetic code. An especially rapid rate of development may be seen in those scientific trends that, by integrating the achievements of various scientific branches, open up new prospects for the solution of major contemporary problems, such as the development of new energy sources and materials, the improvement of man’s relation to nature, the control of large systems, and space research.

The lawlike regularities and trends in the development of science. The history of science, which extends over the past 2,000 years, clearly reveals a number of general lawlike regularities and trends. As early as 1844, Engels formulated a thesis concerning the accelerated growth of science: “Science advances in proportion to the knowledge bequeathed to it by the previous generation” (K. Marx and F. Engels, ibid., vol. 1, p. 568). As contemporary research has demonstrated, this thesis can be expressed in the form of an exponential law characterizing the growth of certain parameters of science beginning in the 17th century. The amount of scientific activity doubles approximately every ten to 15 years, and this is reflected in the increasingly rapid growth in the number of scientific discoveries and the quantity of scientific data, as well as in the number of persons employed in science. According to data compiled by UNESCO, between the 1920’s and the early 1970’s, the number of scientific workers increased by 7 percent annually, whereas the population as a whole increased by only 1.7 percent annually. (In the 1970’s the growth indicators of science in the United States and certain other capitalist countries began to decrease, reflecting the “saturation” of science.) Consequently, the current number of scientists and scientific personnel is more than 90 percent of the total number of scientists in the entire history of science.

The development of science is cumulative: at each historical stage science sums up its past achievements. Every scientific discovery becomes an integral part of the entire body of scientific knowledge; it is not nullified by subsequent advances in knowledge but only reinterpreted and refined. The continuity of science assures its development in a unified, irreversible manner. Because of its continuity, science also serves as a kind of “social memory” of mankind that crystallizes in theoretical form man’s past experience in understanding reality and mastering its laws.

Scientific development is reflected not only in the increasing accumulation of knowledge. It also affects the entire structure of science. At each historical stage scientific knowledge employs a set of cognitive forms—fundamental categories and concepts, methods, principles, and schemes—which constitute the mode of thought. For example, observation as the basic method of obtaining knowledge is characteristic of the classical mode of thought; modern science relies on experimentation and on an essentially analytical approach, which directs thought to the simplest, indivisible elements of the reality under investigation; and contemporary science strives for an integral and multifaceted understanding of the objects under study. Once established, each specific structure of scientific thought opens the way for an extensive development of knowledge—for the application of knowledge to new spheres of reality. However, the accumulation of new material that cannot be explained on the basis of existing schemes necessitates a search for new, intensive ways of developing science. From time to time this results in a scientific revolution—a radical change in the primary components of the content structure of science—and in the introduction of new principles of cognition and new scientific categories and methods. The alternation of extensive and revolutionary periods of development, characteristic both of science as a whole and of its various branches, is eventually reflected in corresponding changes in the organizational forms of science.

The entire history of science shows a complex dialectical interplay of differentiation and integration: mastery of a growing number of new spheres of reality and a deepening of knowledge lead to the differentiation of science and to its division into ever more specialized fields. At the same time, the need to synthesize knowledge is constantly expressed in the trend toward the integration of the sciences. Initially new branches of science arose to deal with particular subjects of inquiry as new spheres and aspects of reality were drawn into the process of cognition. Contemporary science is increasingly shifting from a subject to a problem orientation, in which new fields of knowledge arise to resolve a major theoretical or practical problem. Many interdisciplinary sciences, such as biophysics, have arisen in this manner. The appearance of these sciences attests to the ongoing process of differentiation, but they also represent a starting point for integrating hitherto distinct disciplines.

Important integrative functions in certain branches of science are performed by philosophy, which gives a general outline of the scientific conception of the world, and by such individual disciplines as mathematics, logic, and cybernetics, which provide science with a system of uniform methods.

Structure of science. The disciplines that together constitute the system of science may be subdivided into three major groups (subsystems)—the natural, social, and engineering sciences, which differ in their subject matter and method. There is no well-defined boundary between these subsystems, and a number of scientific disciplines occupy an intermediate position. For example, industrial aesthetics brings together the engineering and social sciences; bionics integrates the natural and engineering sciences; and economic geography combines the natural and social sciences. Each of these subsystems in turn consists of a system of individual sciences that are coordinated and subordinated in various ways according to subject matter and method. The extremely complex problem of detailed classification has not yet been resolved (see below. Classification of sciences).

In addition to traditional research, conducted within the framework of a single branch of science, the problem-oriented character of contemporary science has stimulated extensive interdisciplinary and comprehensive research that draws upon several different disciplines whose combination is determined by the nature of the problem. An example of such research is the study of the conservation of nature, which integrates the applied sciences, biology, earth science, medicine, economics, mathematics, and other fields. Such studies, arising in connection with the fulfillment of major economic and social tasks, are typical of contemporary science.

The various sciences are generally classified as fundamental or applied depending on their orientation and their relation to practical activity. The fundamental sciences aim at gaining knowledge of the laws that govern the behavior and interaction of the basic structures of nature, society, and thought. These laws and structures are studied in “pure form,” regardless of possible application. The fundamental sciences are therefore sometimes called the pure sciences. The goal of the applied sciences is to employ the results of the fundamental sciences to solve not only cognitive but also practical social problems. Here, not only the attainment of truth but also the satisfaction of social needs serves as the criterion of success. A special branch of research is developing at the interface between the applied sciences and practice in which the results obtained by the applied sciences are converted into technological processes, designs, industrial materials, and so forth.

The applied sciences may emphasize either theoretical or practical problems. For example, electrodynamics and quantum mechanics play a fundamental role in contemporary physics; when applied to specific fields of inquiry they form such branches of theoretical applied physics as the physics of metals and semiconductor physics. The practical application of electrodynamics and quantum mechanics gives rise to such practical applied sciences as physical metallurgy and semiconductor technology, which are directly linked with production through specific research projects. All the engineering sciences are applied sciences.

The fundamental sciences generally outstrip the applied sciences, providing them with a theoretical reserve. In contemporary science the applied sciences account for as much as 80–90 percent of all research and appropriations. One of the major problems in organizing science today is that of establishing strong, planned links between the fundamental and applied sciences and of reducing the time necessary to complete the cycle “fundamental research-applied research-development-introduction.”

A distinction may be drawn between empirical and theoretical levels in research and in the organization of knowledge. Facts, which are obtained through observation and experimentation and which define the qualitative and quantitative characteristics of objects and phenomena, constitute empirical knowledge. Recurrence and the connections between empirical characteristics are expressed through empirical laws that are often probabilistic. The theoretical level of scientific knowledge presupposes the existence of abstract objects (constructs) and of theoretical laws expressing the relations between them; theoretical laws are formulated in order to provide an idealized description and explanation of empirical conditions—to understand the essence of phenomena. Theoretical constructs can be studied without resorting to sensory experience, but such study presupposes the possibility of moving to sensory experience by explaining existing facts and predicting new ones. The existence of a theory explaining in a unified manner the facts that fall within its purview is a criterion for scientific knowledge. A theoretical explanation may be qualitative or, making extensive use of mathematical apparatus, it may be quantitative; quantitative explanations are especially characteristic of contemporary natural science.

The development of a theoretical level brings about a qualitative change in the empirical level. Prior to the elaboration of a theory, the empirical material serving as the theory’s prerequisite is obtained through everyday experience and is described in everyday language, but when the empirical material attains the theoretical level it is “seen” through the prism of theoretical concepts, which begin to direct experimentation and observation —the principal methods of empirical investigation. At the empirical level, such methods as comparison, measurement, induction, deduction, analysis, and synthesis are used extensively. Such cognitive methods as hypothesis, modeling, idealization, abstraction, generalization, and mental experimentation are characteristic of the theoretical level.

All theoretical disciplines have their roots in practical experience. As the various sciences develop, however, they break away from their empirical base and develop in a strictly theoretical manner (for example, mathematics), reverting to experience only in practical applications.

The development of the scientific method was long the preserve of philosophy, which even today continues to play a leading role in working out methodological problems and which serves as a general methodology of science. In the 20th century, methodological means have become much more differentiated and are often worked out by science itself—for example, new categories (such as information) and specific methodological principles (correspondence principle) have been introduced through scientific development. Such branches of contemporary science as mathematics and cybernetics, as well as specially developed methodological approaches (for example, the systems approach), play an important methodological role. As a result, the relations between science and methodology have become highly complex, and the elaboration of methodological problems is assuming an increasingly important place within modern research.

Science as a social institution; organization and management in science. Science became a social institution in the 17th and early 18th centuries, when the first learned societies and academies were founded in Europe and the publication of scientific journals began. Earlier, science as an independent social institution was preserved and developed informally by traditions transmitted through books, instruction, correspondence, and personal contact between scientists.

Science remained “small-scale” until the late 19th century, employing relatively few people. At the turn of the century a new method of organizing science arose: large scientific institutes and laboratories, with extensive technical facilities, were founded, bringing scientific activity closer to the forms of modern industrial labor. “Small-scale” science was thus transformed into “large-scale” science. Contemporary science is becoming more deeply involved with all other social institutions, permeating not only industrial and agricultural production but also politics and the administrative and military fields. As a social institution science is in turn becoming the most important element in socioeconomic potential, requiring growing expenditures; this has made scientific policy one of the leading branches of social management.

With the division of the world into two camps after the Great October Socialist Revolution, science as a social institution developed under fundamentally different social conditions. Under capitalism, where antagonistic class relations prevail, scientific achievements are used largely by monopolies to make superprofits, to intensify the exploitation of workers, and to militarize the economy. Under socialism, scientific development is planned on a national scale in the interests of all the people. Economic development according to plan and the transformation of social relations are carried out scientifically, and science therefore plays a decisive role both in creating the material and technical base of communism and in shaping the new man. A developed socialist society creates unlimited opportunities for scientific advancement in the interests of the workers.

The rise of “large” science resulted primarily from a change in the relation of science to technology and production. Science was subordinate to production until the late 19th century, when it began to outstrip technology and production. The unified “science-technology-production” system emerged, in which science was the dominant element. Since the onset of the scientific and technological revolution science has been transforming the structure and content of material activity. “The production process is increasingly becoming the technological application of science, rather than a process subordinate to the direct skills of the worker” (K. Marx, in K. Marx and F. Engels, Soch., 2nd ed., vol. 46, part 2, p. 206).

In addition to the natural and engineering sciences, the social sciences are becoming increasingly important in modern society. They study man in all his diversity and provide guideposts for social development. There has been a growing convergence of the natural, engineering, and social sciences.

In contemporary science, problems of organizing and directing scientific development have become vitally important. The concentration and centralization of science have stimulated the founding of national and international scientific organizations and centers and the systematic undertaking of large-scale international projects. Governments have created special agencies for the direction of scientific activity, and the scientific policies formulated through these agencies assure the development of science in a goal-oriented manner. Initially scientific research was associated almost exclusively with universities and other higher educational institutions and was organized according to branch of science. In the 20th century there has been a proliferation of specialized research institutions. The declining rate of return from expenditures on scientific activity, especially in fundamental research, has stimulated a search for new forms of scientific organization. Among such new forms are scientific centers for research in particular branches of science (such as the Pushchino Center for Biological Research of the Academy of Sciences of the USSR in Moscow Oblast) and comprehensive scientific centers (Novosibirsk Scientific Center). Research subdivisions have been established to study various problems. To solve specific scientific problems, often of an interdisciplinary nature, special groups, comprising problem-oriented teams, have been created to carry out projects and programs, for example, the space program. Centralization in the supervision of scientific activity is increasingly being combined with decentralization and autonomy in research. Informal problem-oriented groups of scientists—”invisible groups”—are frequently formed. In addition, informal scientific trends and schools, which arose in the period of “small-scale” science, continue to exist and develop within the framework of “large-scale” science.

Scientific methods in turn are being employed more extensively in the organization and direction of other fields. The scientific organization of labor is becoming one of the chief means of increasing the efficiency of social production. Automatic production control systems, designed with the aid of computers and cybernetics, are being introduced. Increasingly, the human factor is becoming the focus of scientific management, particularly in man-machine systems. The results of scientific research are used to improve management principles for groups, enterprises, the state, and society as a whole. Like any social application of science, such use of scientific research serves different ends under capitalism and socialism.

National characteristics, important in the development of science, are reflected in the distribution of scientific personnel, in the national and cultural traditions influencing research in particular fields within the framework of scientific schools and trends, in the relationship between fundamental and applied research on a national scale, and in government policy toward scientific development, which determines, for example, the amount and purpose of appropriations. However, the results of science—scientific knowledge—are essentially international.

The development of science as a social institution is closely associated with the education and training of scientific personnel. The present scientific and technological revolution has opened a gap between the historically established tradition of secondary and higher education and the needs of society (including science). New methods of instruction employing the latest achievements in psychology, pedagogy, and cybernetics are being rapidly introduced to close the gap, and instruction in higher schools has tended to draw closer to research practices in science and production.

In education the cognitive function of science is closely linked to the task of bringing up students to. become full-fledged members of society and inculcating values and moral traits.

The experience of social life and Marxist-Leninist theory have proved conclusively that the ideal of the Enlightenment was Utopian and erroneous; according to this ideal the universal dissemination of scientific knowledge would automatically produce morally superior individuals and a just organization of society. This goal can be achieved only through a fundamental change in the social structure, through the replacement of capitalism by socialism.

Truth, which itself is morally and ethically neutral, is the highest value for science as a system of knowledge. Moral judgments may apply either to activity aimed at gaining knowledge (the scientist’s professional ethics require intellectual integrity and courage in his never-ending search for truth) or to the application of scientific discoveries (here the problem of the relationship between science and morality takes the form of scientists’ moral responsibility for the social consequences of their discoveries). The barbaric use of science by militarists (the Nazis’ experiments on human beings; Hiroshima and Nagasaki) has provoked vigorous social actions by progressive scientists, for example, the Pugwash conferences, aimed at preventing the inhumane application of science.

Various aspects of science are studied by a number of specialized branches, including the history of science, the logic of science, the sociology of science, and the psychology of scientific creativity. A new, comprehensive approach to the study of science that strives for a synthesis of its numerous aspects—the science of science—has developed rapidly since the mid-20th century.

Social role and future of science. In a society of antagonistic classes, the complexities and contradictions associated with the growing importance of science give rise to diverse and frequently contradictory evaluations of science. Scientism and antiscientism represent the two extremes of such evaluations. Scientism converts into absolutes the mode of thought and general methods of the exact sciences and declares science to be the supreme cultural value, frequently rejecting humanitarian and philosophical problems on the grounds that they have no cognitive significance. In contrast, antiscientism proceeds from the assumption that science is fundamentally inadequate for solving basic human problems. In its extreme forms this view regards science as hostile to man and denies that it exerts a positive influence on culture.

Unlike scientism and antiscientism, the Marxist-Leninist world view integrates the objective scientific approach with a viable humanistic orientation. It reveals the means for transforming natural and social reality through science, taking into account the significance of other ways of apprehending the world (which constitute the conditions and prerequisites for science) and combining them in the interest of man.

Bourgeois and Marxist views on the future of science also differ radically. Bourgeois ideas stem from an absolutization of certain aspects of modern science, which are uncritically projected into the future in an unaltered or hypertrophic form. Scientism holds that science will be the only sphere of intellectual culture in the future and will absorb the “irrational” aspect of culture. Antiscientism, on the other hand, condemns science either to extinction or to perpetual opposition to the essence of man, conceived in anthropological terms. The Marxist-Leninist outlook considers contemporary science as a historically conditioned method of producing and organizing knowledge. It holds that in the future science will erase the boundaries separating its various branches, will be further enriched by methodological elements, and will converge with other ways of apprehending the world intellectually. These trends will create the conditions necessary for the emergence of a new, unified science of the future, oriented toward man and his universal creative ability to apprehend and transform reality. “Natural science subsequently will include the science of man to the same extent that the science of man will include natural science: they will be one” (K. Marx and F. Engels, Iz. rannikh proizv., 1956, p. 596). Such a science of the future, harmoniously combining cognitive, aesthetic, moral, and philosophical elements, will correspond to the universal nature of labor under communism, whose immediate goal is the all-round development of man as an end in itself.


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Classification of the sciences. Classification of the sciences consists in the disclosure of the connections between the sciences on the basis of certain principles; these connections are expressed in terms of a logically valid grouping, or sequence, of sciences. In addition to the principles of classification, graphic, including tabular, methods of representation also play a major role.
CLASSIFICATION PRINCIPLES. The connections between the sciences are determined by the objects that the sciences study and by the objective relations between various aspects of the objects; by the methods and conditions for obtaining knowledge about the objects; and by the goals that stimulate and are served by scientific knowledge. From the epistemological standpoint, the principles used in classifying the sciences are divided into objective and subjective ones. Principles are objective when the connection is derived from a relation between the objects themselves, and they are subjective when classification is based on characteristics of the subject. From the methodological standpoint, the principles of classification are divided according to how the connection between the sciences is interpreted. The connection is external when the sciences are merely arranged in a certain order, and it is internal, or organic, when the sciences are derived or developed from one another. In the first instance the operative principle is coordination, and the schema is AǀBǀC, and so forth. In the second instance the principle is that of subordination, and the pattern is A . . . B . . . C, and so on. (The letters represent the different sciences; the vertical lines, sharp breaks between sciences; and the ellipses, transitions between sciences.)
From the standpoint of logic, classification is based on different aspects of a general link between the sciences; these aspects represent the initial and terminal points of a main sequence of sciences. Two principles for ordering the sciences are those of decreasing generality (from the general to the particular) and of increasing concreteness (from the abstract to the concrete). According to the principle of subordination, the sciences are arranged in order of development from the simple to the complex and from the lower to the higher. Here attention is focused primarily on the points of contact and interpenetration between the sciences. There are also other ways of isolating different aspects of a general link between the sciences and forming corresponding principles—for example, from empirical description to theoretical explanation or from theory to practice.
Classification by content considers the relations among sciences as an expression or result of: (1) the progression of knowledge from a general law to its particular manifestation or from general laws of development to particular laws of nature and society, corresponding to the principle of classification based on a consecutive transition from the general to the particular; (2) the progression of knowledge from one aspect of an object to the sum total of its aspects, corresponding to the principle of transition from the abstract to the concrete; and (3) the reflection in thought of the movement of an object from the simple to the complex, from the inferior to the superior, corresponding to the principle of development. The principle of development also includes the progression of knowledge from the general to the particular and from the abstract to the concrete. The dialectical-materialist principles that underlie the Marxist classification of the sciences presuppose the indivisibility of the principle of objectivity and the principle of development (or subordination). There is an internal unity of the epistemological, methodological (dialectical), and logical aspects of the general link between the sciences.
HISTORICAL SURVEY The central issue in the history of the classification of sciences is the relationship between philosophy and the various sciences. This history consists of three main stages: the undifferentiated philosophical science of antiquity and, to some extent, of the Middle Ages; the differentiation of the sciences between the 15th and 18th centuries, when knowledge was analytically divided into separate fields; and the integration of the sciences that began in the 19th century, when the sciences were combined into a unified system of knowledge.
During the first of these stages the idea of classifying knowledge originated in the countries of the ancient East, along with the rudiments of scientific knowledge. The thought of the ancients, notably Aristotle, contained the germ of all later principles of classification, including the division of all knowledge into three main fields according to the object studied: nature (physics), society (ethics), and thought (logic).
In the second stage philosophy split into such distinct sciences as mathematics and mechanics. The prevailing analytical method determined the general character of classification, based on an external juxtaposition of the sciences. The subjective principle of classification took into account such properties of the human intellect as memory (history), imagination (poetry), and reason (philosophy), which represented a considerable advance beyond the theologians’ and Scholastics’ division of secular knowledge into the “seven liberal arts.” The subjective principle, introduced by J. Huarte, was developed by F. Bacon, who divided all knowledge into history, poetry, and philosophy. T. Hobbes, the systemizer of Bacon’s doctrine, sought to combine the subjective and objective principles, holding the mathematical method to be universal and placing geometry at the head of the deductive sciences and physics at the head of the inductive. He tended to arrange the sciences on a continuum from the abstract to the concrete, from the quantitative determination of an object to its qualitative determination. Descartes developed the objective principle of classification according to aspects of the objects under study. The classical division of the sciences into logic, physics, and ethics (P. Gassendi) or physics, practice, and logic (J. Locke) was revived. In the 18th century the objective principle was further developed by M. V. Lomonosov. In contrast, the French Encyclopedists (D. Diderot and D’Alembert) essentially adopted Bacon’s principles and schema. The separation of knowledge into the three main branches of nature, society, and thought gave way to finer subdivisions beginning in the 18th century.
The transition to the third stage in the history of the classification of sciences occurred during the first three quarters of the 19th century and consisted of two distinct trends. The first trend, based on the general principle of coordination, ran counter to the prevailing tendency of scientific development in the 19th century. Two solutions to the problem of classification were proposed within the first trend.
(1) The formal solution—based on the principle of coordination from the general to the particular in order of decreasing generality—was developed in France in the early and mid-19th century. Saint-Simon proposed an objective principle of classification according to a progression from simpler, more general phenomena to more complex and particular phenomena. Adopting Saint-Simon’s system, A. Comte systematized his ideas, although he also exaggerated them. Comte identified six primary (theoretical, abstract) sciences constituting an encyclopedic sequence, or hierarchy, of the sciences: mathematics, astronomy, physics, chemistry, physiology, and sociology. (The mechanics of terrestrial bodies was included in mathematics and psychology in physiology.) Comte did not have a historical view of nature; the historical element manifested itself only in man’s knowledge of nature. His system rested on the principle of coordination, and he assigned to sociology a separate place in his hierarchy. Comte’s classification was significant in that, first, he identified the truly basic sciences, corresponding (if mathematics is disregarded) to the principal forms of the motion of matter in nature and to the social form of motion (the subject of sociology). Second, in Comte’s classification the basic sciences are placed in a correct, albeit external, relation to one another in the sequence in which they developed. Comte’s system, therefore, was a prerequisite for classification based on the principle of subordination.
(2) The formal solution to the problem of classification employing the principle of coordination from the abstract to the concrete (in order of decreasing abstraction) was widely accepted in Great Britain in the mid- and late-19th century (S. T. Coleridge, W. Whewell, J. Bentham), Criticizing Comte, J. S. Mill and H. Spencer advocated giving a place to psychology in the hierarchy of the sciences. Spencer rejected Comte’s premise that every science has abstract and concrete parts, asserting that all sciences are divided into the abstract (logic and mathematics), the concrete (astronomy, geology, biology, psychology, and sociology), and those that are intermediate—the abstract-concrete sciences (mechanics, physics, and chemistry). Although distinct boundaries separate these three groups, gradual transitions occur within them. Spencer applied the idea of evolution only to the concrete sciences, and he also denied that there was a logical link between classification and the history of knowledge of the world.
The second trend in the transition to the third stage in the history of classification was the introduction of the principle of subordination, in accordance with the idea of the development and general link between natural phenomena. Here, too, there were two different solutions.
(1) The principle of subordination was elaborated idealistically as the principle of the development of the spirit (but not of nature) by I. Kant, F. W. J. von Schelling, and, especially,G. Hegel. Hegel proposed a triadic division, corresponding to the general tendency of his philosophical system, which was divided into logic, the philosophy of nature, and the philosophy of the spirit. The philosophy of nature was further subdivided into mechanism (mechanics, astronomy), chemism (physics, chemistry), and organism (biology). For all its artificiality, this system reflected, albeit in distorted form, the idea of the development of nature from its lower to its higher levels, up to the thinking spirit.
(2) The principle of subordination and an approach to the theoretical synthesis of knowledge were developed from a materialist standpoint in Russia. In order to bring about a synthesis of the sciences in the mid-19th century, it was necessary to bridge the gap between philosophy and the natural sciences that had been created by the positivists (as A. I. Herzen attempted to do) and to mend the breach between the natural sciences and the humanities (N. G. Chernyshevskii). For Herzen, historicism in understanding nature was organically combined with historicism in comprehending the development of knowledge of nature. Herzen’s historicism provided a strong methodological foundation for a synthesis of the sciences. The same was true of Chernyshevskii, who, like V. G. Belinskii before him, criticized the limitations of Comte’s views.
In the late 19th century an idealist line, associated with the incipient crisis in natural science, became apparent in the development of non-Marxist systems of classification. For the most part the general principle of coordination continued to be the basis for classifying the sciences. In France, Comte’s ideas gave way to the Machist views of H. Poincare, E. Gablot, and H. A. Naville. Eclectic principles of classification were advanced by E. Dühring and W. Wundt in Germany and by T. G. Masaryk in Bohemia. Classifications were also elaborated from the standpoint of neo-Kantianism, which grew out of the rupture between the sciences dealing with nature (whose phenomena were considered to be lawlike) and the science of society, or history (whose events were represented as a jumble of chance occurrences). H. Cohen and, to some extent, E. Cassirer and P. Natorp sought to impose unity on diversity by using mathematically derived concepts. Mathematics accordingly became the dominant science. The Machists and energeticists based their classification of the sciences on a rejection of the specific features of social phenomena, regarding them as merely complex biopsychic phenomena (R. Avenarius, E. Mach) or energetic biophysical phenomena (W. Ostwald). Some philosophers and scientists adopted a formal approach to classification, singling out a particular aspect of the general connection between the sciences (or correspondingly between world phenomena) and making it the principal, decisive aspect. An example of such an approach was the geographic school, which held that the main connection was the spatial relation between things and phenomena. The leading representatives of this school were E. Chizhov, I. Mechnikov, and L. Berg in Russia and A. Hettner and F. Ratzel in Germany.
In Russia classifications based on coordination of the principles of coordination were proposed by such philosophers as M. M. Troitskii and N. Ia. Grot. In France and Switzerland classification of the sciences was reflected in the writings of E. Meyerson and J. Piaget, who has tried to develop a genetic epistemology in contrast to the conventional, static view of human knowledge. Piaget arrived at a cyclical scheme that takes into account the transition from object to subject and vice versa.
With the spread of neopositivism, a classification of the sciences on a logical positivist basis was worked out by P. Oppenheim in Germany, P. Frank in Austria, G. Bergmann in the USA, and A. J. Ayer in Great Britain. The holists J. C. Smuts and A. Meyer-Abich tried to place life, or the spiritual aspect, at the center of their classification of the sciences. The Swiss spiritualist A. Reymond proposed a formal and relativistic scheme for classifying the sciences.
After World War II the influence of neo-Thomism and objective idealism (N. Hartmann) on the sciences, including classification, increased significantly in the Western countries. Pope Pius XII wrote of the three implements of truth—science, philosophy, revelation—of which the third is the highest and to which the first two must adapt. The neo-Thomists adhere to this view, for example, E. Gilson and his pupil M. de Wulf, who has constructed a three-level pyramid with the particular sciences at the base, the general sciences, or philosophy, in the center, and theology at the apex. Logical and mathematical-logical studies on the structure of scientific knowledge, notably those of L. von Bertalanffy, are closely related to the problem of the classification of sciences.
MARXIST CLASSIFICATION OF THE SCIENCES. The third stage in the history of the classification of the sciences was embodied in the works of the founders of Marxism. Relying on the dialectical materialist method that they had developed, Marx and Engels overcame the limitations of the two previous extreme concepts of classification—Hegel’s idealism and Saint-Simon’s metaphysical tendency—and critically revised the valuable aspects of these concepts. As a result, new principles were developed that organically combined two basic elements: an objective approach and the principle of subordination, or development. The discovery of the basic laws of materialist dialectics laid the foundation for a general theoretical synthesis of the sciences that encompassed the three main fields of knowledge—nature, society, and thought. This synthesis presupposed the solution of two problems: the relationship between philosophy and natural science and between the natural and social sciences. The position of the engineering sciences in the general system of knowledge was defined as the connecting link between the natural and social sciences. Engels’ concept of “form of motion,” common to all aspects of nature, included not only the different types of energy found in inanimate nature but also life—the biological form of motion. The sciences therefore naturally fall into the sequence mechanics-physics-chemistry-biology. Engels showed that the sequence of the forms of motion corresponds to the successive stages of nature’s development as a whole and of the history of science. The coincidence of the historical and the logical in the understanding of nature and in the development of nature itself led to the solution of the methodological problems of classification and to the division of the history of science into periods.
Further developing his system of classification, Engels took into account the material bearers, or substrata, of different forms of motion. His classification thus touched upon the theory of the structure of matter (atomism). By determining the bearers of various forms of motion, Engels established a full correspondence between the sequence of matter’s increasingly complex forms of motion and the general sequence of their bearers, which are formed from each other through division of the initial masses. However, the hypothetical assumption that “ethereal particles” are carriers of light and electrical phenomena violated the harmony of the entire system, insofar as it was assumed that because they were physical, these particles must arise through the division of atoms into smaller particles. It thus turned out that only molecular physics precedes chemistry in the general sequence of the sciences and that the physics of “ether” follows chemistry. In the 20th century this sequence was confirmed by the emergence of subatomic (nuclear and quantum) physics. Recognition of the division of the line of nature’s development chiefly into the inanimate and the animate introduced a complication into Engels’ classification.
The principles of Marxist dialectical logic worked out by Lenin had a direct bearing on the task of classifying the sciences. Especially important were Lenin’s statements concerning the necessity of preserving the unity of the historical and the logical; of taking into account the bifurcation of the whole into contradictory parts, transitions, and relations between phenomena; and of understanding the relationship between theory and practice. In the early years of Soviet power, most of the classifications proposed adhered to some extent to the principles of conventional formal classifications. A notable exception was K. A. Timiriazev’s classification, which rested on a historical-evolutionary foundation and approached the Marxist interpretation.
It was only in 1925 that Engels’ classification became known through the publication of his Dialectics of Nature. However, the first efforts to draw upon the ideas of Marx, Engels, and Lenin in classification were often unsuccessful, since those who attempted to incorporate these ideas actually took a mechanistic position. V. Rozhitsyn offered a classification of the sciences that was strongly influenced by Hegelianism. Investigation of the place of various sciences within the overall scientific system and attempts to define the subject matter of the sciences contributed to the solution of the problem of classifying the sciences as a whole—for example, N. N. Semenov’s study of the boundaries between physics and chemistry employing Engels’ definition of these sciences. O. Iu. Shmidt attempted to apply Lenin’s thesis concerning the progression of knowledge from living contemplation to abstract thought and from the latter to practice. Shmidt
Table 2. Classification of the social and philosophical sciences
Social sciencesSocial sciencesSocial sciencesPhilosophical sciences
Political economy— the science of the economic baseThe science of the political and legal superstructure— the theory of the state, law, and partyThe science of the ideological superstructure— the various forms of social consciousness that fall within this area,including philosophyPhilosophy
gave special attention to the point of contact between natural science and technology, showing that the boundary between them is gradually being erased.
The general ideas of the Marxist classification of the sciences were expounded by B. Barkhash and S. Turetskii. In many cases Engels’ classification was interpreted dogmatically and attempts were made to retain his schema without taking into account the changes that had taken place in science. Other works stressed the need to change Engels’ schema, especially the part that concerned subatomic physics, while retaining and developing the general dialectical materialist principles that he had worked out. Some scholars, notably S. G. Strumilin, developed the idea of a cyclical classification of the sciences. E. I. Mamurin, Z. N. Ambartsumian, and O. P. Teslenko made an important contribution to library bibliographical classification based on the Marxist classification of the sciences.
The general classification of modern science rests on the relationship between the three main branches of scientific knowledge: natural science, the social sciences, and philosophy. Each of the main branches represents an entire group of sciences. The basis, or “skeleton,” of the general classification of science is shown in Table 1. Here the boldface lines designate the primary relations between the three main branches of science. Comparison of the right-hand and left-hand parts of the table reveals the essence of the principles of objectivity and development with respect to classification. The positioning of the sciences in this table directly reflects the historical sequence of the appearance of and the correlation between the stages of the world’s development, as well as the correlation between the most general laws of development (dialectics) and the particular laws of development (the other sciences).
In addition to the three main branches of science, there are major subdivisions that border on the main branches but are not entirely included within any of them. Connections between these subdivisions and the main branches are represented by secondary (broken) lines. These subdivisions are the engineering sciences in the broad sense (including the agricultural and medical sciences), which stand at the interface of the natural and the social sciences, and mathematics, which stands at the interface of natural science (primarily physics) and philosophy (primarily logic). Psychology stands between the three main branches as an independent science that studies man’s psychology from the standpoint of natural history and social development. Psychology is even more closely related to logic, the science of thought within philosophy. Tertiary relations are not depicted in Table 1. For example, mathematical logic (for the most part a mathematical discipline) stands between logic (part of philosophy) and mathematics, and zoopsychology stands between the physiology of higher nervous activity (within natural science) and human psychology.
Occupying a special position are a group of sciences that form the boundary between history (chiefly cultural history) and natural science—the history of the natural sciences themselves. In as much as they are simultaneously sociohistorical and natural sciences, these sciences are related to philosophy.
Classification of the social sciences. Engels called the social sciences the history of man, since each social science is primarily a historical science. Human history may be studied in two cross sections: as the development of society as a whole (the interdependence of all its aspects and elements) or as the development of one or several of its structural aspects in isolation. The first of these approaches is represented by historical science in the narrow sense of the word—the history of the various stages of development of society from the primitive to the modern—and also includes archaeology and ethnology. The second approach gives rise to a group of social sciences that reflect the relation between various aspects or elements of the internal structure of society—the relation between its economic base and its political and ideological superstructures. The objective sequence of the transition from the base to an expanding superstructure determines the arrangement of the sciences in this group. The transition to philosophy in the course of the mental progression from base to superstructure and from the political to the ideological superstructure also represents a step beyond the social sciences into the realm of general world-view problems associated with the science of the most general laws of development and with the science of thought (see Table 2, which is a detailed breakdown of one part of Table 1).
Classification of the natural and engineering sciences. Fundamental changes have taken place in natural science since the 19th century. A new science—subatomic physics (quantum mechanics, electron nuclear physics)—has emerged and radically altered the relationship between physics and mechanics and between physics and chemistry. Cybernetics, which links many branches of natural science, mathematics, and technology, has developed, and space exploration has influenced the development of a number of sciences, especially astronomy. Many transitional and intermediate sciences have appeared, making the science of nature a system of interpenetrating and interwoven sciences in the 20th century.
The sequence of contemporary natural sciences is given in Table 3, which is a more detailed form of Table 1. The division of a number of sciences as a result of the appearance of subatomic physics is indicated by the boldface line. The transitional sciences are enclosed in rectangles.
The classification of the engineering sciences is presented here in relation to the classification of the natural sciences, but the engineering sciences are also connected with economics and with the main sectors of the national economy—industry (heavy and light, processing and extracting, transport and communications), agriculture (crop cultivation and animal husbandry), and public health. The engineering sciences are linked to the social sciences through these sectors of production and through the material life of society in general.
On the border between the natural, mathematical, and engineering sciences classification takes into account not only the qualitative transitions from lower and simpler forms of motion to higher and more complex ones, but also the contradictions found in nature that cause a split in the lines or trends of nature’s development and the polarization of new types of matter and forms of motion.
Table 4. Linear classification
Philosophical sciences
Mathematical sciences
Mathematical logic
Applied mathematics, including cybernetics
Natural and engineering sciences
Space exploration
Applied physics
Chemical physics
Physical chemistry
Industrial chemical sciences, including metallurgy
Physical geography
Agricultural sciences
Human physiology
Medical sciences
Social sciences
Economic geography
Socioeconomic statistics
The science of the base and superstructures: political economy, political science, jurisprudence, history of art, etc.
Pedagogy and other sciences
Nature’s development can be analyzed not only in terms of individual forms of the motion and types of matter, but also in terms of nature as a whole, that is, it may be analyzed as the interaction of all the forms of motion and types of matter that coexist at any given stage of development. In this case the subject matter of the natural sciences is the individual stages of nature’s development as part of the universe. Individual celestial bodies, a system of such bodies, or even the universe as a whole (cosmology) may be chosen as the area of study. This is the subject of astronomy with its associated sciences of astrophysics, astro-chemistry, and astrobiology, which have been developed as a result of man’s breakthrough into space. A narrower field of study is the earth as an individual body (planet), whose history as a whole is the subject of geology and whose surface is the subject of physical geography and the related sciences of phytogeography and zoogeography. A still narrower field is the earth’s biosphere, which constitutes the subject of biology and the related science of biogeochemistry. Thus, still another sequence of sciences is formed that essentially coincides with Table 3, if astronomy is placed beside mechanics and physics and physical geography is placed between geology and biology: astronomy-geology-geography-biology.
PRACTICAL SIGNIFICANCE OF CLASSIFICATION. Classification is the theoretical basis for many branches of practical activity. It is used in organizing scientific institutions and determining the relationship between them, in planning research projects, particularly comprehensive ones, in coordinating the work of scientists with different specializations, and in applying theoretical research to practical tasks stemming from the requirements of the national economy and from the demands of ideological, political, and economic activity. Classification is important in education, particularly in universities and in technical, agricultural, medical, and specialized liberal arts institutions, where it is employed in integrating the theoretical and technical disciplines and in determining the relationship between philosophy and other disciplines. Classification is also used in writing comprehensive, encyclopedic works (particularly in defining their structure), in writing related teaching aids and manuals, in planning general exhibitions, and in organizing library science and library classification. In library classification it is important to be able to move from a branch or closed classification to a linear one. Table 4 offers an example of such a transition.


(science and technology)
A branch of study in which facts are observed and classified, and, usually, quantitative laws are formulated and verified; involves the application of mathematical reasoning and data analysis to natural phenomena.

veterinary medicine

, science
the branch of medicine concerned with the health of animals and the treatment of injuries or diseases that affect them
References in periodicals archive ?
Such a study may provide insight to the faulty axioms taken within modern science, as well as provide a perspective on modern day humanity's latent ability to regain harmony with nature.
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This "continuity of the Hermetic tradition" survived both the definitive scholarly demonstration that the writings attributed to Hermes were in fact not earlier than the Christian era, and the philosophical redefinition of the relationship between man and world that fostered the development of modern science.
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As for the rest, they have even been told that the ancient writers of the Bible miraculously knew what it took modern science centuries to learn: that the Earth is round, that it orbits the sun, and so forth.