SCIENTIFIC MEMOIRS 



BEING 



EXPERIMENTAL CONTRIBUTIONS 



TO 



A KNOWLEDGE OF RADIANT ENERGY 



BY 



JOHN WILLIAM DRAPER, M.D., LL.D. 



PRESIDENT OF THE FACULTY OF SCIENCE IN THE UNIVERSITY OF NEW YORK 

 AUTHOR OF U A TREATISE ON HUMAN PHYSIOLOGY*' "HISTORY OF THE 

 INTELLECTUAL DEVELOPMENT OF EUROPE 



THE AMERICAN CIVIL WAR " ETC. 



(5* 



*-vu 



NEW YORK 

 HARPER & BROTHERS, PUBLISHERS 



FRAXKLIN SQUARE 



1878 



