. The cell in development and inheritance. Cells. Fig. 94. — Entiance and rotation of the sperm-head and formation of the sperm-aster in the sea-urchin, Toxopneustes {A-F. X 1600; G, //, X 800). A. Sperm-head before entrance; n. nucleus; m. mid- dle-piece and part of the flagellum. B. C. Immediately after entrance, showing entrance-cone. D. Rotation of ihe sperm-head, formation of the sperm-aster about the middle- piece. E. Casting off of middle-piece; centrosome at focus of the rays {cf. Fig. 12). The changes figured occupy about eight minutes. F. G. Approach of the germ-nuclei; growth of the

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. The cell in development and inheritance. Cells. Fig. 94. — Entiance and rotation of the sperm-head and formation of the sperm-aster in the sea-urchin, Toxopneustes {A-F. X 1600; G, //, X 800). A. Sperm-head before entrance; n. nucleus; m. mid- dle-piece and part of the flagellum. B. C. Immediately after entrance, showing entrance-cone. D. Rotation of ihe sperm-head, formation of the sperm-aster about the middle- piece. E. Casting off of middle-piece; centrosome at focus of the rays {cf. Fig. 12). The changes figured occupy about eight minutes. F. G. Approach of the germ-nuclei; growth of the aster. 1 Cf. p. 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, Macmillan

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcells, bookyear1911