S. CALVIN SMITH’s scientific contributions

The studies herein reported were undertaken for the purpose of determining what changes, if any, were induced in the mother heart by pregnancy. Clinical observations were supplemented by electrocardiographic studies, in order to secure written evidence of any possible heart abnormalities which might not be detected by ordinary clinical methods. The opportunity to study the hearts of babies immediately following birth and for varying periods during the first few weeks thereafter was taken advantage of at the same time, and the observations on the hearts of the newborn are incorporated in this article. The investigations were conducted at the Medico-Chirurgical Hospital of the University of Pennsylvania Graduate School of Medicine during the summer and fall months of 1921.REASONS FOR EMPLOYING ELECTROCARDIOGRAPHY For the information of those who may not yet appreciate the clinical significance of the recently introduced method of heart examination, it is well to set forth at