Evidence is adduced that infants in utero, 1 month before birth, can be stimulated by a loud noise and react thereto by demonstrable movements. During the honking of an automobile horn changes in respiration were noted in one instance with the "existence of inhibitory effect." During concerts mothers have been aware of movements of the fetus. In one case a baby 1 week old stopped, while nursing, at the sound of a small gong. Possibly the skin is also a sensitive receptor to sound.