. Biology and its makers. Biology -- History. c. Fig. 76.—The Egg and Early Stages in its Development. (After Gegenbaur.) which they are separated by a lifeless matrix, the latter being the product of cellular activity. Fig. 77 shows a stage in the development of one of the mollusks just as the differentiation of cells has commenced. The Nucleus.—To the earlier observers the proto})lasm appeared to be a structureless, jelly-like mass containing granules and vacuoles; but closer acquaintance with it has shown that it is in reality very complex in structure as well as in chemical composition. It
. Biology and its makers. Biology -- History. c. Fig. 76.—The Egg and Early Stages in its Development. (After Gegenbaur.) which they are separated by a lifeless matrix, the latter being the product of cellular activity. Fig. 77 shows a stage in the development of one of the mollusks just as the differentiation of cells has commenced. The Nucleus.—To the earlier observers the proto})lasm appeared to be a structureless, jelly-like mass containing granules and vacuoles; but closer acquaintance with it has shown that it is in reality very complex in structure as well as in chemical composition. It is by no means homogeneous; adjacent parts are different in properties and aj^titudes. The nucleus, which is more readily seen than other cell dements,. 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 and company
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