U. S. DEPARTMENT OF AGRICULTURE. 



BUREAU OF PLANT INDUSTRY— BULLETIN NO. 45. 



B. T. GALLOWAY, CldefnfBure.au. 



THE PHYSIOLOGICAL ROLE OF MINERAL 

 NUTRIENTS IN PLANTS. 



BY 



Dr. OSCAR LOEW, 



bo: 



G 



Professor op Agricultural Chemistry in the 

 Imperial University of Japan. 



VEGETABLE PATHOLOGICAL AND PHYSIOLOGICAL 

 INVESTIGATIONS. 



Issued July 18, 1903. 



WASHINGTON: 

 government printing office. 



1 90 3. 



