This monograph deals with certain aspects of x-ray examination of the alimentary tract, notably double-contrast studies of the stomach and colon. In the preface the author emphasizes that the book is not intended for beginners but rather for radiologists and those who have been conducting x-ray examinations of the alimentary tract for several years. Advances in x-ray equipment are briefly described. The technique of mucosal radiography of various portions of the intestinal tract is described. Separate chapters then deal with diseases of the esophagus, stomach, duodenum, small intestine, and colon. There are also chapters on diseases of the gallbladder and pancreas and on x-ray examination of the newborn infant. The illustrations are all in "positive" form, which is to be commended. The differential diagnosis of various conditions is not stressed as much as might be desired, nor are the numerous and confusing anomalies of the alimentary tract given sufficient attention.