. The dynamics of living matter. Biochemistry; Reproduction; Regeneration (Animals). 142 DYNAMICS OF LIVING MATTER i8o° and point toward the cathode. The tentacles at the cathode end become more crowded together, reminding one of the tip of a moistened paint brush, and also point more directly toward the cathode. The experiment may be varied in still other ways by cutting smaller or larger pieces from the edge of the swimming bell, but the response is always the same. â â^_s^iââ "Ife, The tentacles, wher- J&^&, JB? ever possible, and to Fig. 29.âAfter Bancroft. a *ess extent the
. The dynamics of living matter. Biochemistry; Reproduction; Regeneration (Animals). 142 DYNAMICS OF LIVING MATTER i8o° and point toward the cathode. The tentacles at the cathode end become more crowded together, reminding one of the tip of a moistened paint brush, and also point more directly toward the cathode. The experiment may be varied in still other ways by cutting smaller or larger pieces from the edge of the swimming bell, but the response is always the same. â â^_s^iââ "Ife, The tentacles, wher- J&^&, JB? ever possible, and to Fig. 29.âAfter Bancroft. a *ess extent the manubrium, bend so as to point toward the cathode. The response depends in no way upon the connection of these organs with the swimming bell, muscles, or nerve ring, for it is obtained equally well with isolated tentacles and pieces of tentacles. Isolated tentacles when placed transversely to the current lines curve so as to assume a more or less complete U -shape, with their concave side toward the cathode. When placed parallel to the current, the tentacles do not curve" (Fig. 30). The latter observation shows very nicely the fact that the whole reaction is due merely to an increase in the tension of the muscles on the cathode side of the organ. We are dealing here with the galvanotropic reactions of sessile organs where the whole reaction is merely a galvanotropic curvature. Wherever the current affects the locomotive organs of a free- swimming animal, besides the galvanotropic orientation of the animal, a swimming either toward the cathode or anode must occur. As an example, the reaction of an Infusorian, Paramecium, may be quoted. Verworn observed that Para- mecium, when put into a trough through which a galvanic cur- rent passes, is oriented in such fig. 30.âafter Bancroft. a way as to put its oral pole toward the cathode. It swims in this orientation toward the cathode.* The mechanism of this reaction was discovered by The locomotion of Paramecium i
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