SCIENTIFIC MEMOIRS 



BEING 



EXPERIMENTAL COiNTRIBUTIONS 



TO 



A KNOWLEDGE OF RADIANT ENERGY 



BY 



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



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



AUTHOR OF "A TREATISE ON HUMAN PHYSIOLOGY" "HISTORY OF THE 



INTELLECTUAL DEVELOPMENT OF EUROPE " " HISTORY OF 



THE AMERICAN CIVIL WAR " ETC. 



NEW YORK 



HARPER & BROTHERS, PUBLISHERS 

 FRANKLIN SQUARE 



1878 



