. General physiology; an outline of the science of life. 84 GENERAL PHYSIOLOGY In the contents of many cells there occurs a fourth group of solid elements, which either do not take part at all in the life- process of the cell, or have ceased to do so. These are indigestible bodies which are taken in occasionally, such as sand-grcans (Fig. 26), which are met with in many Amaibce, the indigestible residue of food-stuffs, such as shells, skeletons, and the capsules of food-organ- isms, and excretory substances, which remain for some time in the cell-body as useless by-products or as end-products
. General physiology; an outline of the science of life. 84 GENERAL PHYSIOLOGY In the contents of many cells there occurs a fourth group of solid elements, which either do not take part at all in the life- process of the cell, or have ceased to do so. These are indigestible bodies which are taken in occasionally, such as sand-grcans (Fig. 26), which are met with in many Amaibce, the indigestible residue of food-stuffs, such as shells, skeletons, and the capsules of food-organ- isms, and excretory substances, which remain for some time in the cell-body as useless by-products or as end-products of metabolism, to be excreted later. Finally, among the solid elements of the protoplasm in certain cells, especially in aquatic animals, there occur not rarely symbiotic or parasitic unicellular organisms which strictly do not belong to the protoplasm of the cell in question, but in individual cases play an important role in the life of their host. Among such .symbiotic organisms are especially many algse, the Zooxanthellce and the. 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 Verworn, Max, 1863-1921; Lee, Frederic S. (Frederic Schiller), 1859-1939. London, Macmillan and co. , limited; New York, The Macmillan company
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