. Behavior of the lower organisms. Animal behavior; Invertebrates. 0 — Fig. 104. — Another method of reaction to the electric current havior is often observed in other infusoria, in Colpidium. After Pearl through the action of similar causes. (1900). as In such + infusoria as Stentor, where the peristomal cilia form a circle surrounding the anterior end, there is no reason for such a conflict of tendencies. The peristomal cilia are divided by an electric current coming from one side, so that the ani- mal turns directly away from the side on which these cilia strike backward (Fig. 105). If the
. Behavior of the lower organisms. Animal behavior; Invertebrates. 0 — Fig. 104. — Another method of reaction to the electric current havior is often observed in other infusoria, in Colpidium. After Pearl through the action of similar causes. (1900). as In such + infusoria as Stentor, where the peristomal cilia form a circle surrounding the anterior end, there is no reason for such a conflict of tendencies. The peristomal cilia are divided by an electric current coming from one side, so that the ani- mal turns directly away from the side on which these cilia strike backward (Fig. 105). If the anterior end is directed toward the anode at the beginning, the animal doubtless turns as usual toward the right aboral side. In other positions the usual method of turning seems to have no effect on the reactions. In Vorticella and other infusorians resembling Stentor in the distribution of the cilia, the orientation to the current would doubtless take place in the same direct manner, though this has never been determined. In Spirostomum and Opalina, the conflict of the two tendencies mentioned above leads to certain very remarkable and complex results. Under usual con- ditions Spirostomum takes a transverse position in the electric current, while Opalina swims to the anode. The gross features of the behavior thus differ markedly from those shown by most other Fig. 105. — Re- action of Stentor when transverse to the cur- rent. It turns directly toward the cathode, all the cilia concur- ring to produce this 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 Jennings, H. S. (Herbert Spencer), 1868-1947. New York, The Columbia university press, The Macmillan company, agents; [etc. , etc. ]
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