The classical methods of stimulation employed in studies of touch have been electromechanical and electrical, with some use of air jets. The present paper is concerned with vibratory stimulation of the skin by means of an electrostatic field, a method suggested by Sommer and von Gierke.1 These authors demonstrated that a force can be applied between the body surface and an electrode not in direct contact with the body, the body surface acting as one plate of a parallel-plate capacitor and the electrode as the second plate. In this situation the force is generated by the application of a high D.C. biasing voltage across the two 'capacitor plates,' with the result that the skin is attracted or displaced towards the electrode. The D.C. biasing voltage may then be modulated by imposing an A.c. voltage whose frequency and amplitude may be varied by E. Since the force is proportional to the square of the voltage at any moment, the D.C. biasing voltage must be large compared to the A.C. modulating voltage in order to reduce the distortion in the waveform of the A.c. A more complete discussion of this method and particularly of its role in the auditory perception of modulated electromagnetic fields is given in the Sommer and von Gierke paper. The intent of the present study was to investigate the use of this means of vibratory stimulation of the skin and to determine the effects of varying electrode-area and site of stimulation on the threshold-frequency function.