A series of 6 cases of gallstone ileus at the Salem Hospital from 1938 to 1940 has focused my attention on this unusual form of intestinal obstruction. In the twenty-five years from 1915 to 1940 this diagnosis has been confirmed in 13 cases at the Salem Hospital. This series is one of the largest to be reported from one hospital. Balch1 listed only 10 cases from the Massachusetts General Hospital, Boston. Likewise, at the Mayo Clinic, Rochester, Minn., Wakefield, Vickers and Walters2 found only 10 cases. Yet the incidence of intestinal obstruction in these institutions is of course much greater than in the Salem Hospital.
According to the literature, intestinal obstruction is due to a gallstone in about 1 to 2 per cent of the cases. In this series gallstones were responsible in 6 per cent. In 1925 Moore3 made an estimate of 400 reported cases of