STUDIES ON THE PROTOPLASMIC NATURE OF STIMULATION AND ANESTHESIA. II

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Abstract
A current of 2 ma. acting for 2 min. caused a decrease in the structural viscosity of Spirogyra protoplasm in the vicinity of the electrodes, detd. in this and the following expts. by the centrifuge method. With durations up to 6 min. the decrease in structural viscosity spread to other cells. After more than 6 min. duration the viscosity increased on the anodal side of the filaments and in a small region near the cathode, and decreased in regions adjacent to the region of increased structural viscosity near the cathode. Disease, CO2, previous exposure to cold, and mechanical impacts caused a decrease in the structural viscosity of the protoplasm in cells of Spirogyra. In most filaments recovery from the effects of CO2 and mechanical impacts occurred in less than 10 min. The effects of 2 successive mechanical stimuli were additive. Stimulation by dilute ether and mechanical impacts was also additive.

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