U. S. DEPARTMENT OE AGRICULTURE. 



BUREAU OF PLANT INDUSTRY —BULLETIN NO. 45. 



B. T. GALLOWAY, Chief of Bureau. 



THE PHYSIOLOGICAL ROLE OF MINERAL 

 NUTRIENTS IN PLANTS. 



Dr. OSCAR LOEW, 



Professor of Agricultural Chemistry in the 

 Imperial University of Japan. 



VEGETABLE PATHOLOGICAL AND PHYSIOLOGICAL 

 INVESTIGATIONS. 



Issued July 18, 1903. 



WASHINGTON: 



government printing office, 



19 3. 



