Issued November IH, 1910. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF PLANT INDUSTRY— Circular No. 71. 

 B. T. GALLOWAY, Chief of Bureau. 



LEGUME INOCULATION AND THE LITMUS 

 REACTION OF SOILS. 



BY ^"^f^O^lS. 



KARL F. KELLER^L^N, Physiologist in Charge, 



AND 



T. R. ROBINSON, Assistant Physiologist, 

 Soil-Bacteriology and Water-Purification Investigations. 



WASHINGTON : GOVERNMENT PRINTING OFFICE : 1810 



