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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



in geology, a method in the natural sciences for the study of the earth’s development. Actualism comes from the proposition that the “present is a key to the understanding of the past.” It is an integral part of the comparative historical method which has found wide application in geology. Actualism, based on the concepts of the interaction of the composition of mountain types, the specific aspects of the environment, and the dynamics of geological processes, permits science to utilize the data of present-day natural phenomena and the effects of their action for the purpose of inferring the nature of the ancient geological conditions in which rocks were formed. The term actualism appeared in the German geological literature during the second half of the 19th century and found widespread application during the 1920’s. Understanding of the concept changed over the years with changes in the approach to the connection of past and present.

The rudiments of actualism appeared at the earliest stages of human knowledge, in ancient myths, biblical passages, and the writings of the ancient naturalists. Actualism was later applied in the analysis of geological history, at first irrationally—in Middle Asia by Avicenna and al-Biruni, 10th-11th centuries, in Italy by Leonardo da Vinci, 15th—16th centuries, in Denmark by N. Steno, 18th century—and more systematically from the middle of the 18th century—for instance by M. V. Lomonosov in Russia and Hutton in Great Britain. Karl Hoff in Germany and particularly Charles Lyell in Great Britain made major contributions to the foundation and development of the method in the first half of the 19th century. The latter, however, having demonstrated the significance of actualism in the interpretation of geological history, used actualism as one of the elements of uniformitarianism, which arises from the concept of the immutability of the system of geological factors in time.

The error of these inferences was soon discovered, and since the end of the 19th century actualism has been applied to the study of the evolution of the earth and the constantly changing geological environment. Great contributions to the development of actualism have been made by Russian scientists like N. I. Andrusov, A. D. Arkhangelskii, and N. M. Strakhov, J. Walther in Germany, L. Cayeux in France, and others who confirmed the validity of actualism as a method and not as the fundamental principle of all geology.

Specialized discussions on the validity of using the term actualism, particularly in lithology, took place in Germany during the 1930’s and in the USSR during the 1950’s.


Zhemchuzhnikov, Iu. A. “K voprosu o sovremennom sostoianii aktualisticheskogo metoda v litologii.” In Litologicheskii sbornik, issue 1. Leningrad-Moscow, 1948.
Strakhov, N. M. Osnovy istoricheskoi geologii, 3rd ed., part 1. Moscow-Leningrad, 1948.
Shatskii, N. S. [et al.] “K voprosu o periodichnosti osadkoobrazovaniia i o metode aktualizma ν geologii.” In the collection K voprosu o sostoianii nauki ob osadochnykh porodakh. Moscow, 1951.
Walther, J. Einleitung in die Geologie als historische Wissenschaft, parts 1–3. Jena, 1893–94.
Kaiser, E. “Der Grundsatz des Aktualismus in der Geologie.” Zeitschrift der Deutschen Geologischen Gesellschaft, 1931, vol. 83, fasc. 6.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
"Oughts, Options, and Actualism." The Philosophical Review 95, no.
This aesthetic criterion, incorporating (A) and similar to Schlesinger's style of actualism, is the one I propose to defend here.
The A-series, by contrast, with its distinguished present, permits one to express the thesis of presentism, the temporal analog of actualism: the only things that exist are the things that exist now.
Roberts's viewpoint may conceivably be affected by his studies of Giovanni Gentile, whose "actualism" sports an opposition to enduring categories in some ways similar to that of postmodernism.
But Harris did at least differ from them by persisting in his "folly" whereas they came to reject actualism quite early in their careers.
There are, I believe, compelling arguments for actualism and against possibilism--the doctrine that there truly are individuals that do not actually exist--but this is not the place to give them.(3) In any case, surely it is desirable that a theory should be compatible with actualism.
Returning to the debate between actualism and possibilism, it is clear that the actualist must reject this conclusion.
Second is soft actualism, which is the view that although all possible worlds are real, only one is actual.
Like their intellectual confreres elsewhere, the turn-of-the-century Florentine avant-garde--represented here primarily by Giovanni Papini, Giuseppe Prezzolini, and Ardengo Soffici--argued that beauty and violence, thought and action, history and actualism, were not opposites but merely the sterile categories of a rationalism whose time was up.
In Chapters 9 and 11 Weisbuch treats American "actualism" and "ontological insecurity," two other products of America's literary competition with Britain.
Rather, its primary concern is to refute a conception of potency understood as a power oriented toward the future that nevertheless retains the possibility of not actualizing, that is, the very ambivalence that Aristotle placed at the heart of ouvapiC when he declared that "a thing may be capable of being something and yet not be it, or it may be capable of not being something [else] and yet be it." (6) In that respect, Diodorus's thesis would perhaps be more accurately described as actualism rather than fatalism.
KEY WORDS: intentional identity, empty names, possible worlds, merely possible objects, modal actualism