. The cell in development and inheritance. Cells. F'S- 57- — Volvox, showing the small ciliated somatic cells and eight large germ-cells (drawn from life by J. H. Emerton). tion and locomotion, and sooner or later die. A number, usually eight, of larger cells are set aside as germ-cells, each of which by progressive fission may form a new individual like the parent. In this case the germ-cells are simply scattered about among the somatic cells, and no special sexual organs exist. In all the higher types the germ-cells are more or less definitely aggregated in groups, supported and nour- ished
. The cell in development and inheritance. Cells. F'S- 57- — Volvox, showing the small ciliated somatic cells and eight large germ-cells (drawn from life by J. H. Emerton). tion and locomotion, and sooner or later die. A number, usually eight, of larger cells are set aside as germ-cells, each of which by progressive fission may form a new individual like the parent. In this case the germ-cells are simply scattered about among the somatic cells, and no special sexual organs exist. In all the higher types the germ-cells are more or less definitely aggregated in groups, supported and nour- ished by somatic cells specially set apart for that purpose and forming distinct sexual organs, the ovaries and spermaries or their equivalents. Within these organs the germ-cells are carried, protected, and nour- ished ; and here they undergo various differentiations to prepare them for their future functions. In the earlier stages of embryological development the progenitors of the germ-cells are exactly alike in the two sexes and are indistin-. 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
