Revision of the reports of the radiological findings of some sixteen thousand barium meals undertaken in the last ten years has revealed the fact that diverticulosis is by no means an uncommon occurrence, and is not confined to the elderly and the obese—in fact, one of the very best examples of generalised diverticulosis encountered in this series was in a slim little member of the W.R.N.S. of 23 years. This paper is confined to the radiological aspects of diverticula of the stomach and small bowel. Much has been written on the etiology, the morbid anatomy, and the surgery of this condition, but little on the actual radiology, especially in British journals and the older text-books. Shanks, however, gives an excellent description of the radiological appearances and the significance of duodenal diverticulosis, albeit his reference to gastric diverticulosis is somewhat brief. The pathology and the symptomatology are the province of the surgeons. It is, however, necessary to make one or two points without which the radiological findings and description would be meaningless. The first reliable demonstration radiologically of diverticulosis of the stomach was by Brown in 1916. Since then many other cases have been described, and outstandingly valuable articles have appeared from time to time in the British, American, and Continental literature, such as those by Akerlund (1923); Hurst and Briggs (1924); Bell and Ross Golden (1930); Rivers, Stevens, and Kirklin (1935); Ewart and Cordiner (1936); Martin, who collected the references of ninety-two cases (1936); Boulton Myles; Paul Shiflett (1937); Reich (1941); Telford (1944); and Walters (1946).