Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect eightlecturesons00wall Year: 1903 PLANT CURRENTS 15 voLt - O-O£>- voLC •010- 2 70 2O m. FIG. 5.—Vine-shoot. Electrical Effects of Mechanical Excitation (10 centigrammetres) before and after boiling. The first four excitations (before boiling) give responses of , , , volt. The 5th, 6th, and 7th excitations (after boiling) give no response. The deflection preceding the ist excitation is by volt, and the resistance of the stem between leading-off electrodes was 500,000 ohms.
Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect eightlecturesons00wall Year: 1903 PLANT CURRENTS 15 voLt - O-O£>- voLC •010- 2 70 2O m. FIG. 5.—Vine-shoot. Electrical Effects of Mechanical Excitation (10 centigrammetres) before and after boiling. The first four excitations (before boiling) give responses of , , , volt. The 5th, 6th, and 7th excitations (after boiling) give no response. The deflection preceding the ist excitation is by volt, and the resistance of the stem between leading-off electrodes was 500,000 ohms. The deflection preceding the 5th excitation is by volt, and the resistance of the boiled stem was 60,000 ohms. FIG. 6. Experiment (3023).—Bean-Radicle (Phaseolus) 3 inches long and quite etiolated, incubated in the dark at 25° for five days. Led off to recording galvanometer by two unpolarisable electrodes, A and B. The radicle is struck transversely near A, then near B, by a bristle fixed to the end of a revolving rod. In each case the deflection is such as to indicate that the struck spot is rendered electropositive (galvano- metrically negative) to the unstruck spot. The effects are completely abolished by strong tetanisation.
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