WHILE studying the functional pathology of the intestine in 1959, our group became interested in finding some way of recording the functional alterations of intestinal activity. After some preliminary experiments we succeeded in recording the functional electrical currents of the dog's intestine. After Alvarez1 we have called this method electroenterography. Because of our interest in the clinical pathology of the intestine, we came to the conclusion that only multichannel electrical recording with simultaneous mechanical registration from the same point would properly depict the full activity of the living intestine. To avoid mistakes in the interpretation of the electroenterograms (EEnGs), routine pneumograms and electrocardiograms were simultaneously obtained. Thus the whole recording composed of several curves might be called electropolyenterography (EPEnG). Materials and Methods Operative Methods. —Recordings were taken from dogs and men. Dogs were operated on after pentobarbital anesthesia through a midline laparotomy. Loops of duodenum, jejunum, and ileum