INCIDENCE From available material it was difficult to determine how frequently tuberculosis of the stomach occurs. Data collected from various sources are given in table 1. There were even fewer dataavailable on which to base an idea of the frequency of the lesion as found at operation on the stomach. At the Mayo Clinic it occurred in 0.035 per cent of the total number of 7,416 gastric operations. Clairmont's1 report included 2 tuberculous stomachs in 258 gastric operations (0.80 per cent), and Demel's2 report included 3 in 1,568 (0.19 per cent). In the data from the Mayo Clinic and the articles just cited, the combined incidence of tuberculosis of the stomach, as discovered at operation, was 0.34 per cent. The average incidence as derived from the total number of necropsies also was 0.34 per cent. Tuberculosis of the stomach has been known as a disease of the adult