The monograph delineates the normal development of the position of the intestine. In a chapter given on general considerations of position disorders, three main categories are distinguished: disturbances of rotation, disorders of growth of separate parts of the intestine, and disorders of the attachment of the mesenteries. In other chapters, various abnormalities of rotation are described, including nonrotation, malrotation, and inverse rotation, as well as anomalies affecting various sections of the intestine. On the basis of 28 clinical observations in children from 1 day to 15 years of age, given in detail and with reference to the literature, the symptomatology is outlined. In the absence of symptoms referable to the abnormality, a diagnosis was made accidentally by a roentgen examination or at operation or at postmortem examination. In a number of cases additional disorders of development were noted, for instance, congenital heart lesions. Symptoms referable to the anomalies may be