. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. Fig. 6.—Karyokinesis. (.Klein.) A, ordinary nucleus of a columnar epithelial cell; B, C, the same nucleus in the stage of convolution; D, the wreath, or rosette form; E, the aster, or single star; F, a nuclear spindle from the Descemet's endothelium of the frog's cornea; G, H, I, the diaster; K, two daughter nuclei. ment of pus-corpuscles in the interior of different tissue-cells in inflam- mation (Fig. 7). The best object for the study of cell reproduction by division, and the one of most interest for us,
. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. Fig. 6.—Karyokinesis. (.Klein.) A, ordinary nucleus of a columnar epithelial cell; B, C, the same nucleus in the stage of convolution; D, the wreath, or rosette form; E, the aster, or single star; F, a nuclear spindle from the Descemet's endothelium of the frog's cornea; G, H, I, the diaster; K, two daughter nuclei. ment of pus-corpuscles in the interior of different tissue-cells in inflam- mation (Fig. 7). The best object for the study of cell reproduction by division, and the one of most interest for us, is found in the fertilized ovum of mammals. As the ovum approaches maturity, even before impregnation takes place, the germinal vesicle becomes obscure and more and more irregular in out- line, its membrane and reticulum disappear, and the germinal spot is broken up. What remains of the germinal vesicle becomes converted into a striated, spindle-shaped body, which moves to the surface of the ovum, to there undergo division into two parts. One part becomes ex- truded from the ovum to form what is known to einbryologists as the polar cell, and is soon followed by a second similar cell, while the portion of the spindle remaining within the ovum forms a new nucleus, the female pronucleus, from which, in conjunction with the male elements, the future embryo is Fig. 7,—The Formation of Pus-Cor- puscles in the Interior of Epithe- lial Cells, showing Endogenous Cell-Formation. (Eanke.) A, single cylindrical cell from the human bile-duct; B, a similar cell containing two, C containing four, and D numerous pus-cells; E, isolated pus-corpuscles; F, a ciliated epithelial cell from the human respiratory tract, containing a single pus-corpuscle ; and G, a pave- ment epithelial cell from the urinary Madder of man, containing numerous Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - co
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