A current of dry air is projected against the skin and passes out through a band of fine silk (or spun glass) fibers coated with a deliquescent salt. A continuous record of changes in resistance due to changes in the ionization of the fibers is obtained by a galvanometer with vacuum tube amplification. This moisture recording device is arranged in the center of, but insulated from, a zinc plate which serves as an electrode for measuring the galvanic skin-reflex. In order to determine changes of both potential and resistance of the skin, a known E. M. F. was introduced into the circuit with the subject at 1 1/2 sec. intervals. This gave 2 parallel broken records, one with and the other without an external potential, the difference between them being a function of a known E. M. F. and a calculable resistance. The effect of a known resistance was determined by frequent substitution of a standard in place of the subject. It is shown that the initial rise of the galvanic reaction following excitation begins about 1 sec. before the appearance of moisture on the surface of the skin, and that the appearance of moisture on the surface tends to approximate the time of flexion or peak of the galvanic curve. A positive correlation exists between the curves representing the secretory and the electrical phenomena. An increase in amplitude or duration of moisture change is correlated with an increase in amplitude and duration of both the ascending and descending parts of the skin-reflex curve. The galvanic skin-reflex is attributed to relatively independent E. M. F. and resistance changes. It is a function of the breakdown of semi-permeable membranes, and not due merely to the presence of conductive moisture on the skin. Sensory phenomena, such as tingling, warmth and shivering, were described by various subjects. Those making such observations were given a string to pull by which to indicate the presence of the sensory changes in the region to which the electrodes were applied. The duration of these sensory phenomena was positively correlated with the duration and magnitude of the electrical and secretory changes.