MELLON LECTURE 



(UNDER THE AUSPICES OF THE SOCIETY FOR BIOLOGICAL RESEARCH) 



UNIVERSITY OF PITTSBURGH 

 SCHOOL OF MEDICINE 



SEVENTH LECTURE 



INTERPRETATIONS OF THE INITIAL PHASES 

 OF THE ELECTROCARDIOGRAM WITH 

 SPECIAL REFERENCE TO THE 

 THEORY OF "LIMITED POTEN- 

 TIAL DIFFERENCES" 



BY 



SIR THOMAS LEWIS, M.D., F.R.C.P. 



1922 



