. Cytology, with special reference to the metazoan nucleus. Cells. FiG. 71. Equatorial plates of spermatogonia of three Vertebrates. A, Lepidosinn ; B, salamander; C, rabbit. The three figures are drawn to the same scale to show the relative amounts of chromatm present m each. ably, however, the idioplasm cannot, strictly speaking, be identified with any substance. The hereditary factors should probably be considered as elementary organisms, consisting mainly indeed of chromatin but possessing an organic structure on which their activities depend. The argument therefore from equality or otherw
. Cytology, with special reference to the metazoan nucleus. Cells. FiG. 71. Equatorial plates of spermatogonia of three Vertebrates. A, Lepidosinn ; B, salamander; C, rabbit. The three figures are drawn to the same scale to show the relative amounts of chromatm present m each. ably, however, the idioplasm cannot, strictly speaking, be identified with any substance. The hereditary factors should probably be considered as elementary organisms, consisting mainly indeed of chromatin but possessing an organic structure on which their activities depend. The argument therefore from equality or otherwise of mass, though weighty, is not conclusive in deciding the claims of the various constituents of the gametes to be considered as the idioplasm. There is no doubt that in animals, at any rate, a certain very small amount of cytoplasm is introduced by the male gamete along with the nucleus (see also under chondriosomes, below). This has, however, been denied in the case of some of the higher plants where it has been held that no cytoplasm enters the egg cell with the nucleus (Strasburger. 1908). but a negative is proverbially hard to 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 Agar, Wilfred Eade, 1882-. London, Macmillan
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectcells, bookyear1920
