. General physiology; an outline of the science of life. 196 GENERAL PHYSIOLOGY unequal in size and their contents differ; the larger one contains the chief mass of the passive yolk, while the smaller one consists principally of active protoplasm. In this way differences arise which have an important bearing upon the subsequent divisions, and become constantly greater. In the third case, that oi gemmation, only a very small portion of the egg-cell becomes divided off; this. Pia. 75.—Formation of the polar bodies in the starfish ; sp, nuclear spindle ; rfcl, first polar body ; rk^, second polar
. General physiology; an outline of the science of life. 196 GENERAL PHYSIOLOGY unequal in size and their contents differ; the larger one contains the chief mass of the passive yolk, while the smaller one consists principally of active protoplasm. In this way differences arise which have an important bearing upon the subsequent divisions, and become constantly greater. In the third case, that oi gemmation, only a very small portion of the egg-cell becomes divided off; this. Pia. 75.—Formation of the polar bodies in the starfish ; sp, nuclear spindle ; rfcl, first polar body ; rk^, second polar body ; tk, egg-nucleus. occurs especially during the maturation of the egg in the forma- tion of the so-called polar bodies or direction-corpuscles, where the process occurs twice in succession (Fig. 75). In partial division the groove that separates the two daughter- halves extends not through the whole cell, but through a part. 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 Verworn, Max, 1863-1921; Lee, Frederic S. (Frederic Schiller), 1859-1939. London, Macmillan and co. , limited; New York, The Macmillan company
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