File:American journal of physiology (1898) (14596547109).jpg

Identifier: americanjourna04ameruoft (find matches)
Title: American journal of physiology
Year: 1898 (1890s)
Authors: American Physiological Society (1887- ) American Physiological Society (1887- ). Abstracts of papers presented at the fall meeting American Physiological Society (1887- ). Proceedings
Subjects: Physiology Physiology
Publisher: (Bethesda, Md., etc.) American Physiological Society (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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ne ofdirection of the current is greater than 90°, and the oral side istowards the cathode (Fig. i, positions B to D), the exact form ofreaction depends as before on the amount of that angle. When theangle is between 90° and about 130° (Fig. i, positions B to C), the reaction in the majority of casesconsists in swimming slowly in aline somewhat transverse to thecurrent and curved towards thecathode and the oral side, tillfinally the animal comes aroundinto orientation. This is evi-dently the reaction of Type II(Fig. 4). Besides this reactionof Type II, Colpidia in thesepositions show reactions of TypeIII and Type IV. The differ-ence shown by animals in thepositions between B and C, fromthose in positions A to B, is inthe relative frequency of occur-rence of the types. In the formergroup, Type IV is relativelymuch more, and Type III rela-tively much less frequent thanin the latter. Type II alsooccurs less frequently amongindividuals of the former group.If the anele formed is between
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.Figure 6.— Diagram showing Type IV ofreaction: 0, oral side; ab, aboral side, 1,2, 3, 4, and 5, different positions taken bythe animal in this type of reaction. 50° and 180° (Fig. I, positions C to D), the reaction is usually that of T)pe I, although Type IV (Fig. 6) frequently occurs. Probably about 80 per cent of the reactions of animals in these positions are of Type I (Fig. 3). In all these cases if the animal is swimming at the time of turn-ing on the current in such a direction as to make with the line ofcurrent any of the angles just discussed, it simply stops at once andreacts as has been described for a quiet animal. Reactions of Certain Infiisoria to Electric Current. 103 In all these reactions there are, under given conditions, individualvariations in the type taken, but some one of those described isalways followed. Weak and Strong Currents. — In case a weak current is used, theonly difference observed is that fewer animals are affected by it, andin fact in such a c

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