. The cell; outlines of general anatomy and physiology. for examination in the animal kingdom are the tissue cells ofyoung larvae of Salamandra maculata, of Triton, the spermatozoaof mature animals, the segmentation spheres of small transparenteggs, especially of Nematodes (Ascaris megalocephala), and ofEchinoderms (Toxopneustes lividus). Amongst plants the proto-plasm of the endosperm of the embryo sac, especially of Fritil-laria imperiaiis, and the developing pollen cells of Liliacese, areespecially to be recommended. a. Cell division, as it occurs in the Salamandramaculata, as an example of
. The cell; outlines of general anatomy and physiology. for examination in the animal kingdom are the tissue cells ofyoung larvae of Salamandra maculata, of Triton, the spermatozoaof mature animals, the segmentation spheres of small transparenteggs, especially of Nematodes (Ascaris megalocephala), and ofEchinoderms (Toxopneustes lividus). Amongst plants the proto-plasm of the endosperm of the embryo sac, especially of Fritil-laria imperiaiis, and the developing pollen cells of Liliacese, areespecially to be recommended. a. Cell division, as it occurs in the Salamandramaculata, as an example of the division of the sperm-mother-cell. First Stage. Preparation of the Nucleus for Division. In the Salamandra maculata certain preliminary changes occurin the resting nucleus some time before division actually com- THE VITAL PHENOMENA OF THE CELL 183 mences. The nuclein granules, which are distributed all over thelinin framework (Fig. 75 A), collect together at certain places andarrange themselves into delicate spiral threads, which are covered A B.
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Keywords: ., bookcentury1800, bookdecade1890, bookidcelloutlines, bookyear1895
