. Biology and its makers. Biology -- History. THE RISE OF EMBRYOLOGY 225 substance between all living organisms, and that the egg and the sperm are endowed with an inherited organization of great complexity, has become the basis for all current theories of heredity and development. So much is involved in this conception that, in the present decade, it has been designated (Whitman) " the central fact of modern ; The first clear expression of it is found in Virchow's Cellular Pa- thology, published in 1858. It was not, however, until the. Fig. 68.—A. Kowalevsky, 1840-1901. peri
. Biology and its makers. Biology -- History. THE RISE OF EMBRYOLOGY 225 substance between all living organisms, and that the egg and the sperm are endowed with an inherited organization of great complexity, has become the basis for all current theories of heredity and development. So much is involved in this conception that, in the present decade, it has been designated (Whitman) " the central fact of modern ; The first clear expression of it is found in Virchow's Cellular Pa- thology, published in 1858. It was not, however, until the. Fig. 68.—A. Kowalevsky, 1840-1901. period of Balfour, and through the work of Fol, Van Beneden (chromosomes, 1883), Boveri, Hertwig, and others, that the great importance of this conception began to be appreciated, and came to be woven into the fundamental ideas of de- velopment. Influence of the Doctrine of Organic Evolution. This doctrine, although founded in its modern sense by Lamarck in the early part of the nineteenth century, lay dormant until Darwin, in 1859, brought a new feature into its discussion 15. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Locy, William A. (William Albert), 1857-1924. New York, H. Holt
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