. A manual of elementary zoology . Zoology. AMCEBA "5 to be rich in fatty substances. Artificial foams can even be induced to carry out movements which in their general features resemble contraction. It should be noted, how- ever, that the special features of the contraction of Amoeba are not found in them. Amosba feeds on small organisms, which it ingests by Nutrition. surrounding them with outgrowths of its pro- toplasm and so engulfing them. Ingestion usually takes place at the hinder end of the animal. The space in the body which the prey comes to fill would thus be lined with ectopla
. A manual of elementary zoology . Zoology. AMCEBA "5 to be rich in fatty substances. Artificial foams can even be induced to carry out movements which in their general features resemble contraction. It should be noted, how- ever, that the special features of the contraction of Amoeba are not found in them. Amosba feeds on small organisms, which it ingests by Nutrition. surrounding them with outgrowths of its pro- toplasm and so engulfing them. Ingestion usually takes place at the hinder end of the animal. The space in the body which the prey comes to fill would thus be lined with ectoplasm, but the ectoplasm here becomes absorbed into the sur- rounding endoplasm, so that it is clear that there is no essential difference between the materials which compose these layers. There is then secreted around the food particle a layer of water containing sub- stances which kill it and digest its nourishing part. The reaction of Fig. Ji.—Amceba froleus in the act of this fluid 4s acid at first, ingesting/, a small vegetable organ- but probably later be- ism which is t>eing swallowed, comes .alkaline. The space containing the digestive juice is known as a. food vacuole. The only organic matter digested by Amoeba is protein. The dissolved substances are then incorporated and the un- digested parts are egested by the simple process of being left behind as the animal flows along. The protoplasm of Amoeba is irritable, automatic, and : conductive. Its irritability is not, as in higher animals, specially developed in sense organs, but that this property exists in it is shown in various ways. If it be stimulated by passing an electric - shock through a drop of water in which it has been placed, it will contract into a mass without pseudo- podia. If it be pricked with the end of a fine thread of glass it will draw back and flow away. In this case the. Irritability, Automatism, and Please note that these images are extracted from scanned page images that may ha
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