The passive electrical characteristics of human tissue were studied by the method of the current transient associated with an abrupt voltage change. The output of a rectangular wave generator of variable pulse width, height, and frequency was applied to electrodes on the arm. The voltage across a small resistor in one lead is proportional to the current through the body. Photographs were taken of the transient pattern on an oscilloscope screen and were analyzed for characteristic exponential decreases in current with time. Two characteristic exponential current decay rates were found and a network giving the same type of transient presented. The decay rates were shown to be relatively constant from person to person. A table shows the effect of variation of several factors involved. It was postulated that a correlation between physiol. data of nerve and muscle excitability and their passive electrical characteristics may be found by the transient method.