. Elementary biology, animal and human. Biology. 172 ANIMAL BIOLOGY it slowly flows about the one-celled plant or animal and finally ingulfs it. The processes of digestion, assimilation, respiration, excretion, and reproduction (Fig. 121) are much the same in amoeba as in Paramecium. Both these animals belong to a group of animals known as the Protozoa (Greek protos = first or simplest + zoon = animal).. Fig. 121. — An amoeba dividing. 127. To show that the higher animals are composed of many cells. — Laboratory study. Frogs are continually shedding parts of their epidermis, and pieces of this
. Elementary biology, animal and human. Biology. 172 ANIMAL BIOLOGY it slowly flows about the one-celled plant or animal and finally ingulfs it. The processes of digestion, assimilation, respiration, excretion, and reproduction (Fig. 121) are much the same in amoeba as in Paramecium. Both these animals belong to a group of animals known as the Protozoa (Greek protos = first or simplest + zoon = animal).. Fig. 121. — An amoeba dividing. 127. To show that the higher animals are composed of many cells. — Laboratory study. Frogs are continually shedding parts of their epidermis, and pieces of this thin membrane are likely to be seen cling- ing to a frog in an aquarium or floating in the water, Secure a piece of this membrane, spread it on a slide, add a drop of water and a cover glass, and examine with the low power of the microscope. 1. Describe the form and color of each cell. 2. In each cell notice a body, usually near the center and slightly more dense than the rest of the cell. This is the cell nucleus. (If the nucleus does not show clearly, add a drop of iodine to the membrane.) The rest of the cell is the cell body. a. Name, now, two parts of a cell of the frog's 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 Peabody, James Edward, b. 1869; Hunt, Arthur Ellsworth, joint author. New York, The Macmillan company
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