A manual of practical medical electricity : the Röntgen rays and Finsen light . of katelectrotonus. On opening, katelectrotonus disap-pears on one side and anelectrotonus on the other ; andthe disappearance of anelectrotonus is the stimulus. Electro-Physiology 163 Further, as the effect of the current depends largelyupon its concentration or density, and as this must, ccBterisparibus, be greatest on the side nearest the electrode, theestabhshment of katelectrotonus on that side of the nervewill be a stronger stimulus than the establishment of kat-electrotonus on the other side ; , w
A manual of practical medical electricity : the Röntgen rays and Finsen light . of katelectrotonus. On opening, katelectrotonus disap-pears on one side and anelectrotonus on the other ; andthe disappearance of anelectrotonus is the stimulus. Electro-Physiology 163 Further, as the effect of the current depends largelyupon its concentration or density, and as this must, ccBterisparibus, be greatest on the side nearest the electrode, theestabhshment of katelectrotonus on that side of the nervewill be a stronger stimulus than the establishment of kat-electrotonus on the other side ; , will alwaysappear before , and will also appear , because it is physiologically the stronger stimulus. This (electrotonic) explanation of the laws of contrac-tion is the one generally accepted in Germany, GreatBritain, and America, though not in France. Waller andDe Watteville, by a series of elaborate and careful experi-. FiG. 95.—Anodal and Kathodal Areas on Ulnar Nerve(De Watteville). ments, have demonstrated the leading facts of electrotonusin the human body. It has already been remarked that the degree of stimula-tion obtained varies with the current-strength. This isonly partially true. Chauveau has shown, using curvesto indicate his results, that, with closing shocks, theamount of stimulation obtained with the kathode at firstgrows with the strength of the current, then remainsstationary, and may sometimes decrease ; the degree ofstimulation obtained with the anode, however, regularlyincreases with the current, and therefore overtakes andsurpasses that obtained with the kathode. There is, then,a neutral point, where both kathode and anode equallystimulate. With opening shocks the results are the re-verse. The anodal opening is the first to appear, and the II—2 164 A Manual of Practical Medical Electricity degree of current-strength necessary to equalize thekathodal and anodal closing stimulat
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