. Biology and its makers. Biology -- History. 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 protoplasm 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
GLIX-115-RHK96X
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GLIX Prime
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. Biology and its makers. Biology -- History. 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 protoplasm 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