Eight lectures on the signs of life from their electrical aspect eightlecturesons00wall Year: 1903 II.] EYEBALL CURRENTS 23 flashing lights, or a succession of colours, in accordance with the accidents and irregularities of such coarse artificial disturb- ance. And no doubt—could we only detect it—the physico- chemical disturbance is attended by an electrical disturbance The latter will, however, be most easily demonstrated to you with an excised eyeball. § 12. Demonstration.—Such an eyeball has been removed Light. FlG. 8.—Frog's eyeball between unpolarisable electrodes for demonstration
Eight lectures on the signs of life from their electrical aspect eightlecturesons00wall Year: 1903 II.] EYEBALL CURRENTS 23 flashing lights, or a succession of colours, in accordance with the accidents and irregularities of such coarse artificial disturb- ance. And no doubt—could we only detect it—the physico- chemical disturbance is attended by an electrical disturbance The latter will, however, be most easily demonstrated to you with an excised eyeball. § 12. Demonstration.—Such an eyeball has been removed Light. FlG. 8.—Frog's eyeball between unpolarisable electrodes for demonstration oi the electrical effects of light and of electrical excitation. The circuit from the eye is completed through a compensator, secondary coil, and a galvanometer. The arrows through the eyeball and the galvanometer indicate the direction of the initial current and of the normal response. Arrows near the compensator wires indicate the direction of a compensating counter-current. as carefully as possible a few moments ago from a pithed frog. ' Carefully ' in this connection means with as little compression of the eyeball as possible, and in point of fact such compression
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