426:"Theoria Generationis" after observing them in his studies on chick embryos. According to Locy, since he assumed a total lack of organization in the beginning, he was obliged to make development "miraculous" through the action on the egg of a hyperphysical agent; from a total lack of organization, he conceived of its being lifted to the highly organized product through the action of a "vis essentialis corporis." In 1768–1769, he published his best work in embryology on the development of the intestine; of which Baer said, "It is the greatest masterpiece of scientific observation which we possess." Again, according to Locy, while Wolff's investigations for "Theoria Generationis" did not reach the level of
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in the embryo, which, under Pander and von Baer, became the fundamental conception in structural embryology—he laid the foundation for the germ layer theory. Wolff foreshadowed the germ layer theory by showing that the material out of which the embryo is constructed is, in an early stage of
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development, arranged in the form of leaf-like layers. Locy recognizes Wolff as the foremost investigator in embryology before von Baer. Wolff contended that the organs of animals make their appearance gradually and that he could actually follow their successive stages of formation.(Dye)
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Wolff’s "De
Formatione Intestinorum" rather than his "Theoria Generationis" embodies his greatest contribution to embryology; in it he foreshadows the idea of
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Content in this edit is translated from the existing German
Knowledge (XXG) article at ]; see its history for attribution.
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Caspar
Friedrich Wolff, a silhouette by F. Anting (1784), one of the two known portraits of Wolff
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Frank J. Dye, Dictionary of
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with his dissertation "Theoria
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William A. Locy, Biology and its Makers, Henry Holt and
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was already sitting in the sperm. His views were not well received.
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who is widely regarded as one of the pioneers of modern embryology.
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a machine-translated version of the German article.
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378:was a powerful antagonist. During the
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