. Experimental morphology. Protoplasm; Growth. A B Fig. 32. — Galvanotaxis of Amoeba diffluens. A, Amoeba creeping, unstimulated; B, after closing of the constant current. The arrow indicates the direction of locomotion. (From Vekworn, '95.) that to the Metazoa. After dealing with the phenomena we must attempt to explain them. When such an amoeba as that shown in Fig. 32, A, is sub- jected in a drop of water to the action of a weak constant current, as already indicated (p. 129), it contracts, especially upon the face turned towards the anode. If the current is not strong enough to produce dis
. Experimental morphology. Protoplasm; Growth. A B Fig. 32. — Galvanotaxis of Amoeba diffluens. A, Amoeba creeping, unstimulated; B, after closing of the constant current. The arrow indicates the direction of locomotion. (From Vekworn, '95.) that to the Metazoa. After dealing with the phenomena we must attempt to explain them. When such an amoeba as that shown in Fig. 32, A, is sub- jected in a drop of water to the action of a weak constant current, as already indicated (p. 129), it contracts, especially upon the face turned towards the anode. If the current is not strong enough to produce disintegration at that pole, but only repeated contraction, and if meanwhile tlie kathode pole retains its power of throwing out pseudopodia, the amoeba must grad- ually move from the anode (Fig. 32, 5), and if several Amoebse are under the cover-glass, they will eventually aggregate about the kathode. Here we have, then, in its simplest form, a case of electrotaxis, and, since the organism moves toward the negative electrode, we may call it negative electrotaxis. If now, instead of an amoeba, we watch a free swimming flagellate Infusorian, — Trachelomonas hispida (Fig. 33), — we. 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 Davenport, Charles Benedict, 1866-1944. New York, The Macmillan company; London, Macmillan & co. , ltd.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1897
