This book is a result of a combination of necropsy study of 357 cases of congenital cardiac disease undertaken at the Mayo Clinic between 1920 and 1954 and an extensive review of the literature on this subject. Inasmuch as this study is selective in nature, the authors specifically point out that the exact incidence in the general population, the sex distribution, causes of death, and frequency of occurrence of various complications cannot be determined without qualification.