Eight lectures on the signs of life from their electrical aspect eightlectureson00wall Year: 1903 Fig. 15.—Diagram to illustrate the effect upon a galvanometer (broken line) of a simultaneous larger positive current and smaller negative current, the latier commencing and ending more rapidly. Fig. 15.—Retinal response of the second stage, illustrating the double effect. to give the negative response of the third type by gentle massage or by steady moderate compression, and in the latter case it is

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