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A simple and reliable method for production of gastric ulcer on rats by stress was described. Rats fixed on boards were immersed in water of 25°to the depth of xiphoide. After 20 hours, marked gastric erosions were found in the glandular portion of the stomach. This stress is more favourable than other stresses as cold, restraint, or emotional stress by stress box in view of incidence and mortality. Anticholinergics or central depressants effectively inhibited the ulceration and combination of both drugs suppressed it more effectively than single administration of each drug.