A method of prolonged constant recording of the periodic motor activity of the stomach was used in chronic experiments on dogs with fistulae of various portions of the digestive tract. The existence of periodic gastric motor activity during intestinal and gastric digestion was revealed. This type of motor activity was recorded in dogs on mixed diets; these dogs also received a mixture of foods during the experiment. On the basis of these experiments it is suggested that periodic motor activity plays an important role in the natural passage of food from the stomach into the intestine. Stimulation of gastric motor function for 10–40 minutes in connection with the act of eating was also noted.