. The treatment of disease by electric currents : a hand-book of plain instructions for the general practitioner . Fig. 227. Zinc electrodes : insulated with soft rubber tubing to expose any de-sired surface. If the tortuosity of the canal prevents a complete applica-tion to its entire surface it must be done by the familiar sec-tional method. For this purpose select one of the set of zinctips and amalgamate it with mercury. ELECTRICAL TREATMENT OF FIBROIDS. 551. Fig. 228. Set of copper or zinc for same.

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