The author reviews the Dutch Indian literature on gastric and duodenal ulcers and discusses their frequency as demonstrated at necropsy and as diagnosed clinically in the medical and surgical sections of the hospital at Batavia. He describes the anatomically and presumably etiologically abnormal types of ulcer and the other inflammatory changes of the gastric mucosa. Necropsies and clinical observations show that Chinese males have ten times as many gastric ulcers as the Malays and that gastric ulcer preponderates over duodenal ulcers. The opposite is true for the Malays, in whom the etiology of the ulcers varies greatly and differs from the common type, not infrequently being of tuberculous origin. This thesis is only of local interest.