Charles Bonnet

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Bonnet, Charles

Bonnet, Charles (shärl bônāˈ), 1720–93, Swiss naturalist and philosopher. He drew attention to parthenogenesis in aphids, but his theories were highly fanciful and unscientific. His books include Traité d'insectologie (1745) and Contemplation de la nature (1764–65).
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Bonnet, Charles


Born Mar. 13, 1720, in Geneva; died May 20, 1793, in Geneva. Swiss naturalist and philosopher.

In 1745, in his Treatise on Insects, Bonnet described an-thropoda, polyps, and worms and related new data on the life and instincts of insects. He was one of the first to describe parthenogenesis in plant lice. He observed the process of regeneration in worms, hydras, starfish, snails, crayfish, and amphibians; he expressed the correct hypothesis that regeneration is, in some species of animals, one of the forms of adaptation to the hostile influences of the external environment.

In 1754, in his work An Investigation of the Role of Leaves in Plants, Bonnet tried to explain the physiological functions of the leaf and the movement of plant fluids. In his works Discourse on Organized Bodies (volumes 1–2, 1762), Contemplation of Nature (volumes 1–2, 1764), and Philosophical Palingenesis (volumes 1–2, 1769), Bonnet emerged as a resolute opponent of the theory of spontaneous generation of microorganisms and as a supporter of the theory of preformation. Bonnet was among the authors of studies on the “ladder of beings,” according to which all inorganic bodies and living organisms are distributed in a certain order, from the simplest to the most complex, including man, and extending further to include supernatural beings—angels, archangels, and so on. In questions of epis-temology, Bonnet considered experience and empirics very important, although he also pointed out that human capabilities of perceiving the world are limited.


Lunkevich, V. V. Ot Geraklita do Darvina, 2nd ed., vol. 2. Moscow, 1960. Pages 65–75.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The naturalist and philosopher Charles Bonnet documented the experiences of his grandfather, Charles Lulin, who had cataracts in both eyes and very little sight in 1970.
Visual release phenomena, such as those seen in Charles Bonnet syndrome, occur exclusively when the eyes are open.
(1.) Berrios GE, Brook P The Charles Bonnet Syndrome and the problems of visual perceptual disorder in the elderly Age Ageing 1982; 11:17-23.
Known as Charles Bonnet syndrome, these are a reaction of the brain to the loss of eyesight.
In addition to several medical causes for this presentation (Table 1), consider Charles Bonnet syndrome in patients with visual loss, presenting as visual hallucinations with intact insight and absence of a mental illness.
Kath said: "He had nightmares and suffered from Charles Bonnet syndrome, which is common for people who have lost their sight and causes hallucinations.
In these DLB cases, the differential diagnosis with other pathological conditions causing hallucinations in the elderly, such as Charles Bonnet syndrome (CBS), can be somewhat difficult.
Charles Bonnet syndrome is a condition characterised by the presence of visual hallucinations in patients having visual impairment most commonly reported in the seventh decade.
Next is an article that discusses the impact of anxiety in persons who have visual hallucinations as a result of Charles Bonnet Syndrome, which affects many older individuals with low vision.