. The plant, an illustration of the organic life of the animal. Biology. 58 THE TISSUES OF PLANTS and so on, so that in^lace of one cell we have 2, then 4, 8, 16, 32, 64, until the whole yolk assumes a mulberry-like appearance. The cells now begin to manifest their individu- ality, and gradually develope into the form of the future worm. Fig. SaccessiTes stages of sogmentatlon in the Tltellus of the ovum of Ascarie aou^ minata. A, recently impregnated ovum, with yolk-hag slightly separated from the enveloping membrane; B^ first fission into two halves; C, second fission forming four segme
. The plant, an illustration of the organic life of the animal. Biology. 58 THE TISSUES OF PLANTS and so on, so that in^lace of one cell we have 2, then 4, 8, 16, 32, 64, until the whole yolk assumes a mulberry-like appearance. The cells now begin to manifest their individu- ality, and gradually develope into the form of the future worm. Fig. SaccessiTes stages of sogmentatlon in the Tltellus of the ovum of Ascarie aou^ minata. A, recently impregnated ovum, with yolk-hag slightly separated from the enveloping membrane; B^ first fission into two halves; C, second fission forming four segments; 1), E, and F, formation of mulberry mass by further seg- mentation; G, the mass of cells showing the form of the future worm; H, the worm formed by the conversion of the yolk-cells, now nearly mature.—Car- TEKTEE. In most of the animal tissues the multiplication of cells by division takes place during the embryonic state of development, but in some cartilages it appears to take place throughout the whole period of their life. Most of the articular cartilages which cover the ends of the bones retain their primitive cellular organization, which may be seen at any time. Fig. 15 shows the successive steps in the mul- tiplication of cartilage cells. In this process, as in all the other acts of cell-life in animals, the nucleus, seems gene- rally to take a more conspicuous part than it does in 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 Coultas, Harland, d. 1877. Philadelphia ; Perry and Erety
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Keywords: ., bookauthorco, bookcentury1800, bookdecade1850, booksubjectbiology
