. The cell in development and inheritance. Cells. GENERAL SKETCH 139 The facts just described are now known to be typical of a large number of cases. We may, however, distinguish two types of ferti-. Fig. 70. —Conjugation of the germ-niiclei and division of the sperm-aster in the sea-urchin Toxopneustes, X 1000. (For later stages see Fig. 37.) . /. Union of the nuclei, extension of the aster. D. Flattening of the sperm-nucleus against the egg-nucleus, division of the aster. ' lization according as the polar-bodies are formed before or after the entrance of the spermatozoon. In the first case,
. The cell in development and inheritance. Cells. GENERAL SKETCH 139 The facts just described are now known to be typical of a large number of cases. We may, however, distinguish two types of ferti-. Fig. 70. —Conjugation of the germ-niiclei and division of the sperm-aster in the sea-urchin Toxopneustes, X 1000. (For later stages see Fig. 37.) . /. Union of the nuclei, extension of the aster. D. Flattening of the sperm-nucleus against the egg-nucleus, division of the aster. ' lization according as the polar-bodies are formed before or after the entrance of the spermatozoon. In the first case, well illustrated by the sea-urchin (Fig. 69), the germ-nuclei conjugate immediately after. 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 Wilson, Edmund B. (Edmund Beecher), 1856-1939. New York : The Macmillan company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcells, bookyear1896
