Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . e small electrode isplaced upon the closed ej^elid, temple or forehead. The large electrodeis placed upon the back of the neck. The room should be darkened andthe patient should keep both eyes closed. 198 LECTURES ON NERVOUS DISEASES. When the sense of faste, the poles should lie in contact withthe cheeks, and the sensations of taste exi)erienced upon both sides bythe patient should be ascertained. A fine electrode ca
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . e small electrode isplaced upon the closed ej^elid, temple or forehead. The large electrodeis placed upon the back of the neck. The room should be darkened andthe patient should keep both eyes closed. 198 LECTURES ON NERVOUS DISEASES. When the sense of faste, the poles should lie in contact withthe cheeks, and the sensations of taste exi)erienced upon both sides bythe patient should be ascertained. A fine electrode can also be placedupon the tongue, the pharynx, or the inside of the cheek, in case local-ized polar reactions are to be determined. A double electrode, with twometal tips which are not in contact, ma^ be employed for this purpose(Neumann). ELECTRICAL EXAMINATION OF THE SENSIBILITY OF THE SKIN. The electrode devised by Erb is, to my mind, the best for this pur-pose. It consists of four hundred varnished wires in a tube of hardrubber. The ends of these wires make a perfectly smooth surface. Thiselectrode is connected with the secondary coil of a faradaic machine and. Fig. 62.—Erbs Electrode for the Examination of Far.\do-Cutaneous Sensibility.—a, A hard-rubber tube ; i>, the free surface of the electrode. is then pressed upon the area of the body to be tested—the other polebeing at the sternum. Tlie minimum of the overlap of the secondarycoil which can be felt, and the maximum which can be endured, are bothrecorded. Homologous parts of each side should be compared with eachother. Regarding this test Erb wisely remarks: The skin, regarded as asensory organ, cannot be tested with irritants other than those adequateto it,—viz., touch, pressure, various temperatures, and the higher gradesof those irritants which produce pain. It may be disputed whether elec-tricity should be included among these adequate irritants of the electric sensation is a specific, distinct q
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