INTERPRETATIONS OF THE INITIAL PHASES 

 OF THE ELECTROCARDIOGRAM WITH 

 SPECIAL REFERENCE TO THE 

 THEORY OF "LIMITED POTEN- 

 TIAL DIFFERENCES" 



) 



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



LONDON 



SEVENTH MELLON LECTURE, DELIVERED BEFORE THE 



SOCIETY FOR BIOLOGICAL RESEARCH, UNIVERSITY OF 



PITTSBURGH SCHOOL OF MEDICINE, MAY 8, 1922. 



