Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect eightlectureson00wall Year: 1903 Fig. 53.—Circular areae of skin of the forearm that have served as electrodes to a constant current for a few minutes. In the upper pair of circles the two electrodes in contact with the skin were a solution of permanganate of potash ; the coloured ion was the anion Mn04, which travels up stream and enters the body at the kathode. In the lower pair of circles, the two electrodes in contact with the skin were a solution of copper sulphate ; the coloured ion was the kati
Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect eightlectureson00wall Year: 1903 Fig. 53.—Circular areae of skin of the forearm that have served as electrodes to a constant current for a few minutes. In the upper pair of circles the two electrodes in contact with the skin were a solution of permanganate of potash ; the coloured ion was the anion Mn04, which travels up stream and enters the body at the kathode. In the lower pair of circles, the two electrodes in contact with the skin were a solution of copper sulphate ; the coloured ion was the kation Cu, which travels down stream and enters the body at the anode. because it has a coloured ion, in this case the anion. If I had taken copper sulphate, where it is the kation copper that is coloured, I should have made the anodic spot the more apparent since the metal travels with the current and is carried into the body at the anode. Two electrodes—one-inch glass tubes half full of perman- ganate of potash—are strapped to the front of my forearm,
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