American journal of physiology . twhen it has accomplished abouthalf the necessary turn, it rotateson its longitudinal axis through180°, and then quickly snapsaround towards the aboral sideinto orientation, and swims to-wards the cathode. This method of reaction evidently forms a dis-tinct type which I have called Type III. In the second method ofreaction, that shown by the last 15 per cent of the animals occupy-ing the defined positions, the Colpidium starts off slowly in thecurved path towards the cathode, but after swimming for a shortdistance, jerks towards the aboral side, without rotatin
American journal of physiology . twhen it has accomplished abouthalf the necessary turn, it rotateson its longitudinal axis through180°, and then quickly snapsaround towards the aboral sideinto orientation, and swims to-wards the cathode. This method of reaction evidently forms a dis-tinct type which I have called Type III. In the second method ofreaction, that shown by the last 15 per cent of the animals occupy-ing the defined positions, the Colpidium starts off slowly in thecurved path towards the cathode, but after swimming for a shortdistance, jerks towards the aboral side, without rotating on thelong axis, thus increasing the arc separating its anterior end fromthe cathode. It then starts ahead in the curved path once movements, namely, swimming ahead in a curved path, moreor less transverse to the direction of the current, followed by a jerktowards the aboral side, are repeated till finally the animal finds itself Figure 4. — Diagram showing Type II ofreaction. References as in the
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