Thirty male schizophrenic patients with peptic ulcer were compared to thirty male schizophrenic patients without peptic ulcer. The patients were studied by a battery of clinical psychological tests and consideration of their clinical histories. It was found that 'the ulcer schizophrenic generally tends to react to the threatening external world by repressing his emotional impulses, while the nonulcer schizophrenic tends to deny the external world and obey his emotional impulses'.