During the twenty-five year period from 1908 to 1932, inclusive, 121,515 patients were admitted to the wards and private wing of the Children's Hospital, Boston, and in this time 372 cases of intussusception were encountered. This report is based on a study of these 372 cases. In order to show the improvement in treatment of intussusception, analyses have been made for the first twenty year period, from 1908 to 1927, as contrasted with the last five year period, from 1928 to 1932. References were made to 63 of these cases in 1915 (Ladd) and to an additional 99 in 1925 (Ladd and Cutler).
INCIDENCE ACCORDING TO AGE AND SEX
Eighty-seven per cent of the cases occurred in children under 2 years of age, and 70 per cent in children between the ages of 4 and 11 months, with the peak of incidence in those at 7 months. The youngest patient