Electrical properties of Nitella (Tolypella) cells were studied, with special reference to their electric resistance The resistance of the protoplasm, as well as the potential of the inside of the cell, was measured by inserting capillary electrode into the cell, which had been sealed with vaseline externally at the middle so that the current across the protoplasm could be readily determined.The characteristics of the rectification and impedance were measured The electric current was found to flow across the protoplasmic layer more easily from the sap to the external water than in the reverse direction. The resistance and the capacitance of the cell varied with the a.c frequencies used for the measurementSimultaneous measurements were made of the action potential, the action current, and the resistance change of the protoplasm in order to determine the relationship between them An intimate parallelism between the time courses of these three phenomena was discovered. An attempt was made to interpret the results by taking into account the dissociation of ions in the protoplasm.
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