. Essentials of medical electricity . Central Galvanization.—One pole at epigastrium, the other at hack of first to seventh cervical vertebra?. (Beard and Rockwell.) 120 ESSENTIALS OF MEDICAL ELECTRICITY. Fig. General Galvanization.—One pole at the epigastrium, the other on cranialcentre, the hair being moistened. Previously, the electrode may be applied, labile,to the forehead. (Beard and Rockwell.) Electro-Diagnosis. One source of error in electro-diagnosis consists in the varia-tion of resistance to the electrical current offered by the ma}- find that a muscle on one s
. Essentials of medical electricity . Central Galvanization.—One pole at epigastrium, the other at hack of first to seventh cervical vertebra?. (Beard and Rockwell.) 120 ESSENTIALS OF MEDICAL ELECTRICITY. Fig. General Galvanization.—One pole at the epigastrium, the other on cranialcentre, the hair being moistened. Previously, the electrode may be applied, labile,to the forehead. (Beard and Rockwell.) Electro-Diagnosis. One source of error in electro-diagnosis consists in the varia-tion of resistance to the electrical current offered by the ma}- find that a muscle on one side of the body requires aconsiderable increase of current to induce contraction, andtherefore may assume degeneration when in reality perfecthealth exists ; careful employment of the milliampere meterwill alone «uard against .this. ELECTRO-DIAGNOSIS. 121 Change in excitability of nerves, due to previous and pro-longed application of currents, is an important source of error,and may be guarded against by refraining from testing a nerveuntil sufficient time has elapsed during which all previous elec-trical excitement may subside. The diffusion of currents to neighboring muscles and nervesis another annoying compli
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