Both carcinoma and sarcoma of the small intestine, exclusive of the rectum, are studied. The various segments are taken up in detail, and comparative work of various authors is quoted, with an extensive bibliography. Detailed pathologic variations are considered. The diagnosis and operability are shown to depend largely on this knowledge. There are numerous drawings included of gross and microscopic specimens, a few roentgenograms, and several sketches illustrating operations on the colon. The author has presented an instructive and interesting review of this large subject, which includes original work, without making the volume too bulky.