. The germ-cell cycle in animals . Cells. GERM CELLS OF HERMAPHRODITES 197 native cell loses its aflfinity for nuclear dyes; the chromatin masses become less numerous and more nearly spherical; and the entire cell increases in size, the nucleus growing much more than the cytoplasm. These progerminative male cells divide mitotically. Fig. 57. — Helix pomatia. Stages in differentiation of male and female sex cells from indifferent cells. A. Epithelial indifferent cell. E. Progerminative indifferent cell. B-D. Stages in transformation of progerminative cell into a spermatogonium. F—G. Stages in t
. The germ-cell cycle in animals . Cells. GERM CELLS OF HERMAPHRODITES 197 native cell loses its aflfinity for nuclear dyes; the chromatin masses become less numerous and more nearly spherical; and the entire cell increases in size, the nucleus growing much more than the cytoplasm. These progerminative male cells divide mitotically. Fig. 57. — Helix pomatia. Stages in differentiation of male and female sex cells from indifferent cells. A. Epithelial indifferent cell. E. Progerminative indifferent cell. B-D. Stages in transformation of progerminative cell into a spermatogonium. F—G. Stages in transformation of progerminative cell into an oocyte. (From Ancel, 1903.) and then pass into the lumen of the acinus, where they may be recognized as spermatogonia of the first order. After the spermatogonia have passed into the lumen of the acinus the wall is seen to consist of two groups of cells; those of one group are central and in contact with the spermatogonia, the others are periph-. 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 Hegner, Robert William, 1880-1942. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcells, bookyear1914
