The scar was made by mechanical and inflammatory way on the mesenterium in dog experimentally. In 22 cases of these 32 cases discahrgesat rest were found in the myogram of dorsal muscles from about 2 weeks after the operation. which ceased immediately by the lesion of the nerves of the mesenterium. Countless nerve fibres in the scar of the mesenterium were proved by Bielschowsky's sheath staining. As mentioned above, it is a viscerosensory reflex caused by abnormal stimulation of afferent nerve fibres passing through the scar.