In a previous article1 we reported a series of ulcer cases which under medical treatment showed relief of symptoms. When these cases were checked by repeated roentgen-ray examinations, a number of patients showed a gradual diminution and a final disappearance of the ulcer niche. Since the roentgen-ray reports corresponded so closely with the patients' improved clinical condition, we felt that this was strongly suggestive of the healing of the ulcer. Especially was this true in patients who were under 45 years of age and who had had short periods of active symptoms. In specimens resected at operation we were able to show by both gross and microscopic methods several cases of healing of duodenal ulcer. In six cases in which a subtotal gastrectomy had been performed a few weeks after hemorrhage, a healed duodenal ulcer was found in the specimens removed at operation. We were not fortunate enough to obtain