. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. UNICELLULAR FORMS 63 limited. When attacked, an amoeba may do only one of three things: It may move, it may become quiet, or it may be unrespon- sive. Responses are o£ necessity slow. It does respond, however, to a variety of conditions. It furthermore is able to select from those available the environment most suitable for its existence. This can be shown by a simple experiment. A culture of amoebae is placed :^^^. Fig. 15.—Diagram of an amoeba in motion, to show how the cytoplasm changes po
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. UNICELLULAR FORMS 63 limited. When attacked, an amoeba may do only one of three things: It may move, it may become quiet, or it may be unrespon- sive. Responses are o£ necessity slow. It does respond, however, to a variety of conditions. It furthermore is able to select from those available the environment most suitable for its existence. This can be shown by a simple experiment. A culture of amoebae is placed :^^^. Fig. 15.—Diagram of an amoeba in motion, to show how the cytoplasm changes position and condition with the advance of the leading pseudopodia. The materials in the fluid central region flow forward and are added to the stiffened outer rind. (Simplified after Mast.) in a long dish so arranged that the temperature, acidity, or other condition, varies along the dish, forming an intensity or concentra- tion gradient from one end of the dish to the other. In time it will. 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 Buchanan, James William, 1888-. New York, London, Harper & brothers
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