io 

 T 



THE CHEMISTRY 

 OF PLANT LIFE 



BY 



ROSCOE W. [JTHATCHER, M.A., D.AGR. 



DEAN OF THE DEPARTMENT OF AGRICULTURE 

 AND DIRECTOR OF THE AGRICULTURAL EXPERIMENT STATIONS, 



UNIVERSITY OF MINNESOTA 

 (FORMERLY PROFESSOR OF PLANT CHEMISTRY. UNIVERSITY OF MINNESOTA) 



FIRST EDITION 



McGRAW-HILL BOOK COMPANY, INC. 



NEW YORK: 370 SEVENTH AVENUE 



LONDON: 6 & 8 BOUVERIE ST., E. C. 4 



1921 



