. A treatise on electrolysis and its applications to therapeutical and surgical treatment in disease . ents;and these influence the path through which the current will of one kind will always go in the direction from the higher tothe lower potential. Consequently where the conducting medium is composed of substanceshaving various potentials, the currents of distribution will have many RESISTANCE AND DIFFUSION !• ELECTRICITY. 9 i directions, but will finally emerge in one direction; ami the currenl femergence from the conductor must always he equal to the current of en-trance
. A treatise on electrolysis and its applications to therapeutical and surgical treatment in disease . ents;and these influence the path through which the current will of one kind will always go in the direction from the higher tothe lower potential. Consequently where the conducting medium is composed of substanceshaving various potentials, the currents of distribution will have many RESISTANCE AND DIFFUSION !• ELECTRICITY. 9 i directions, but will finally emerge in one direction; ami the currenl femergence from the conductor must always he equal to the current of en-trance into the conductor; since we have seen t hat, flic sum f ihe derivedcurrents must always he equal to the original current. In the human body the diffusion of the currenl is from the poinl ofcontact of one electrode, and out at the point of contact of the secondelectrode: now the distribution of the current between these two pointsis not by any means in a regular uniform path: some of the current willpass by an easy channel, some by one less easy, or in technical language. Fig. 18.—If A and B are the positive and negative poles respectively, the bulk of the currentflows in more or less curved lines from A to B through the tissues enclosed between them. Exter-nally to this iiitijMilar region, the direction of the derived currents proceeding from each electrodeis opposed to the main current in the region, A to o, and B to b. We assume here that the body ismade up of a uniformly conducting substance. The thick lines denote the region of greatest cur-rent density. The occurrence of cerebral symptoms (giddiness, flashes of light, the galvanic ,when one of the electrodes is applied to the upper part of the back, is due likewise to the diffusion ofthe current upwards. the current passes through substances which are not equi-potential; thusthe current will pass more readily through the blood ami the blood vessels,through the nerve tissues, and less readily through the b
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