u. s. department of agriculture. 



BUREAU OF PLANT INDUSTRY -BULLETIN NO. 45. 



B. T. GALLOWAY, Chiif of Bureau. 



THE PHYSIOLOGICAL ROLE OF MINERAL 

 NUTRIENTS IN PLANTS. « 



BY 



Dr. OSCAR LOEW, 



Professor of Agricultural Chemistry in the 

 Imperial University of Japan. 



VEGETABLE PATHOLOGICAL. AND PHYSIOLOGICAL* 

 INVESTIGATIONS. 



Issued Ji'ly is, 190:-;. 



WASHINGTON: 



GOVERNMENT PRINTING OFFIOE. 

 1903. 



