. General physiology; an outline of the science of life. ELEMENTARY VITAL PHENOMENA 147 cells. But from this common nutrient liquid each kind of cell removes the substances necessary for its life; the mucous cell takes substances different from those taken by the ganglion-cell, the muscle-cell substances different from those taken by the car- tilage-cell, the liver-cell substances different from those taken by the sense-cell, and so on. The different cells choose entirely different materials, each one according to its need. This phenomenon of food-selection is, perhaps, more remarkable in cert
. General physiology; an outline of the science of life. ELEMENTARY VITAL PHENOMENA 147 cells. But from this common nutrient liquid each kind of cell removes the substances necessary for its life; the mucous cell takes substances different from those taken by the ganglion-cell, the muscle-cell substances different from those taken by the car- tilage-cell, the liver-cell substances different from those taken by the sense-cell, and so on. The different cells choose entirely different materials, each one according to its need. This phenomenon of food-selection is, perhaps, more remarkable in certain free-living cells that take in solid food. Cienkowski. Fig. 47.—Four individuals of Colepa swarming about and ingesting a ball of food. ('65), who has studied in detail the life of the lowest Bhisopoda, the naked monads, gives an interesting description of how Golpo- della and Vampyrella, two simple, naked rhizopod-cells, procure their food, which consists of living alga-cells. Cienkowski relates as follows : " Although the zoospore- and amoeba-conditions of the monads are only naked protoplasmic bodies, their behaviour in seeking and ingesting food is so remarkable that it seems to be the work of conscious beings. Thus, Colpodella pugnax pierces the Ghlamydomonas, sucks up the chlorophyll that flows out, and L 2. 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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