CHEMICAL DISCOVERY 

 AND INVENTION 



IN THE 



TWENTIETH CENTURY 



BY 



SIR WILLIAM A. TILDEN, F.R.S. 



D.Sc., LL.D., Sc.D. 



Professor Emeritus of Chemistry in the Imperial College 

 of Science and Technology 



For wee are borne to quest and seeke after trueth ; to possesse 

 it belongs to a gi eater power." FLORIO'S Montaigne. 



LONDON 

 GEORGE ROUTLEDGE AND SONS, LIMITED 



BROADWAY HOUSE, CARTER LANE, E.C. 

 NEW YORK : E. P. DUTTON AND CO. 



