. Electro-physiology . FIG. 185. with the fact that the electrotonic alterations of excitability increase in intensity and extent of diffusion with the strength of the polarising current. The same applies to the curve (glii} of strong currents, which contrasts with abc, inasmuch as the indifferent point lies near the kathode, so that almost the whole intrapolar tract is in a state of anelectrotonus. It would also be easy to record the after-effects of an- and katelectrotonus, since the excitability of every point, at all events immediately after breaking the current, is exactly opposite to the
. Electro-physiology . FIG. 185. with the fact that the electrotonic alterations of excitability increase in intensity and extent of diffusion with the strength of the polarising current. The same applies to the curve (glii} of strong currents, which contrasts with abc, inasmuch as the indifferent point lies near the kathode, so that almost the whole intrapolar tract is in a state of anelectrotonus. It would also be easy to record the after-effects of an- and katelectrotonus, since the excitability of every point, at all events immediately after breaking the current, is exactly opposite to the effect at closure. We have up to this point considered only the effect of strength of polarising current upon magnitude and diffusion of electrotonic alterations of excitability, yet, as Pniiger has shown, the length of tract traversed, as well as the time-relations of the passage of the current, are not unimportant factors. The first of these two (besides the older experiments of Humboldt, Eitter, and others) was investigated by du Bois-Eeyrnond. According to Ohm's law, the intensity of an electrical current is directly proportional with its and inversely proportional with the VOL. II L
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