. Electro-physiology. Electrophysiology. XI ELECTRICAL FISHES 439 length of intrapolar tract, and the latent period may, with 40-50 mm., be prolonged 0'0055-0'004 sec. With shorter interpolar tracts there is usually an " introductory apex," its latency of discharge with descending currents being sometimes 0, sometimes, however, of measurable proportions. This Schon- lein refers to the diminution, not merely of rate of conductivity, but also of intensity of excitation, due to anelectrotonic inhibition at the anode during each single impact of current (O'OOl" dura-. Fir,. 278.—Exc
. Electro-physiology. Electrophysiology. XI ELECTRICAL FISHES 439 length of intrapolar tract, and the latent period may, with 40-50 mm., be prolonged 0'0055-0'004 sec. With shorter interpolar tracts there is usually an " introductory apex," its latency of discharge with descending currents being sometimes 0, sometimes, however, of measurable proportions. This Schon- lein refers to the diminution, not merely of rate of conductivity, but also of intensity of excitation, due to anelectrotonic inhibition at the anode during each single impact of current (O'OOl" dura-. Fir,. 278.—Excitation of one organ-preparation by discharge from another, through the nerve. (Gotch.) tion). We should anticipate that the discharge of an organ- preparation provoked by excitation of the nerve would be sufficient to excite directly a second preparation in the same circuit. The accompanying schemata (Fig. 278) show that there must then be either summation or subtraction of the galvanometer effect. That this is actually the case has been proved by Gotch with the spring-rheotorne. The alteration (augmentation or diminution) of the galvanometer effect caused by the discharge of the nerve-organ preparation appears regularly about O'Ol" after the maximum of the discharge. One then asks whether. 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 Biedermann, W. (Wilhelm), 1852-1929; Welby, Frances A. (Frances Alice). London : Macmillan
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