PLANT PRODUCTS AND 

 CHEMICAL FERTILIZERS 



BY 



S. HOARE COLLINS, M.Sc., F.I.C. 



LECTURER AND ADVISER IN AGRICULTURAL CHEMISTRY, ARMSTRONG 

 COLLEGE, NEWCASTLE-ON-TYNE (UNIVERSITY OF DURHAM) ; 

 FORMERLY ASSISTANT AGRICULTURAL CHEMIST TO THE 

 GOVERNMENT OF INDIA ; AUTHOR OF " HAND- 

 BOOK OF AGRICULTURAL CHEMISTRY 

 FOR INDIAN STUDENTS " 



NEW YORK 

 D. VAN NOSTRAND COMPANY 



25 PARK PLACE 

 1919 



