American journal of physiology . current one particularColpidium be ob-served, it will be seenthat the orientation in the line of the current with the anterior endto the cathode depends on the position which the animal occupieswith respect to the direction of the current. If the Colpidium happens to lie in the direction of the current, with the anterior end towards thecathode (Fig. 2), when the circuitis completed it swims for the-j-p^ /—s ^^ cathode in a spiral path, or per- haps more exactly in a zigzagpath (Fig. 5); that is, it startsforward at a small angle with thedirection of the current
American journal of physiology . current one particularColpidium be ob-served, it will be seenthat the orientation in the line of the current with the anterior endto the cathode depends on the position which the animal occupieswith respect to the direction of the current. If the Colpidium happens to lie in the direction of the current, with the anterior end towards thecathode (Fig. 2), when the circuitis completed it swims for the-j-p^ /—s ^^ cathode in a spiral path, or per- haps more exactly in a zigzagpath (Fig. 5); that is, it startsforward at a small angle with thedirection of the current, and afterpursuing this path for a varyingdistance, usually from six to ten times the length of the body, itpauses for an instant, rotates through iSo about the long axis, and,turning slightly towards the aboral side again, starts off on a newpath, forming the second arm of the zigzag. This process is repeated Figure 1. — Diagram to indicate the different positionsof Colpidium with reference to the direction of the Figure 2. — Diagram showing Colpidiumin orientation, r, reflex cilia; p, pos-. terior end. lOO Raymond Pearl.
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