In this study, there were 216 cases of gastrocolic and jejunocolic fistulas. Two hundred and two cases were compiled from the literature; twenty-one were observed at the Mayo Clinic, seven of which were reported by C. H. Mayo and Rankin,1 in 1921; therefore, only fourteen of the cases are new. In ninety-five cases, the condition was the result of a jejunal ulcer which developed following posterior gastroenterostomy, and in 121, it was the result of primary abdominal organic lesions. The seventy cases reported previous to 1903 originated from cancer of the stomach or of the colon. Haller2 reported the first case, in 1755, and Murchison3 the first group, which included thirty-three cases, in 1857. Bec4 reported sixty-three cases, in 1897, and Koch5 seventy cases, in 1903. Four years after the first description of a jejunal ulcer, published by Braun,6 in 1899, Czerny7 reported