This work investigates the embryonic development of the heart, specifically focusing on the phenomenon of reversed torsion in the ventricular bend as a potential explanation for congenital cardiac anomalies. Frederic T. Lewis, drawing on early 20th-century anatomical and embryological research, posits a mechanical or developmental cause for these complex conditions. The book likely examines detailed anatomical descriptions and developmental pathways to support its central argument.

This historical medical text likely appeals to specialists in cardiology, embryology, and the history of medicine. Its detailed anatomical and developmental focus suggests a dense, technical read intended for researchers and academics. The work's value lies in its contribution to understanding the historical progression of thought on congenital heart defects.