. Senescence and rejuvenescence. Age; Reproduction. THE GAMETES IN PLANTS AND ANIMALS 327 rate of metaboKsm and are not involved in the early differentiations, but differentiate later. A recent study of modified cleavage made by Boveri ('10) on polyspermic and centrifuged eggs of Ascaris has proved beyond a doubt that the occurrence or non-occurrence of chromatin diminu- tion in a nucleus depends, not upon its quahtative constitution, but upon its cytoplasmic environment. If this is true, persistence of the undiminished condition is not a segregation of preformed germ plasm, but a nuclear reac
. Senescence and rejuvenescence. Age; Reproduction. THE GAMETES IN PLANTS AND ANIMALS 327 rate of metaboKsm and are not involved in the early differentiations, but differentiate later. A recent study of modified cleavage made by Boveri ('10) on polyspermic and centrifuged eggs of Ascaris has proved beyond a doubt that the occurrence or non-occurrence of chromatin diminu- tion in a nucleus depends, not upon its quahtative constitution, but upon its cytoplasmic environment. If this is true, persistence of the undiminished condition is not a segregation of preformed germ plasm, but a nuclear reaction to cytoplasmic conditions. The "germ path" is a feature of the cytoplasm, not of the nucleus, and the cytoplasm is not, properly speaking, a part of the germ plasm at all, but represents the soma of the cell. Which nuclei shall. 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 Child, Charles Manning, 1869-1954. Chicago, Ill. , The University of Chicago Press
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