Although there is no doubt that secretory nerves exist in the intestines - for it has been shown that the entrance of food into the stomach is immediately followed by secretion not only in the small intestine but also in distant parts of the large bowel - still we are yet very far from the knowledge of their exact location. Nervous diarrhoea, which has been described under the motor neuroses, is often accompanied also by an increased flow of intestinal juice. Conditions in which there is a lessened secretion of intestinal juice are not yet positively known. It may be that they exist in cases of constipation, being perhaps the cause of the latter in some instances. While, however, in the disturbances just mentioned the increase or decrease of intestinal secretion is a mere hypothesis, one affection of the intestines exists in which increased secretion is positively found. This is the so-called membranous enteritis.