. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . Schematic representation of the distribution and density of the threads of current with regard totheir entrance deeply into the tissue (in this instance, into the spinal cord): n, when electrodes are inclose proximity; b, when far removed from one another. (Erb.) To affect a small superficial structure, such as one of the peripheralnerves, the active electrode should be small (Fig. 159) and well presseddown upon the nerve. The indifferent electrode (Fig. 159) should belarge. Fia. 159

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