i so PPE ART MENT OF AGRICULTURE. 
BUREAU OF PLANT INDUSTRY—BULLETIN NO. 2i1. 
B. T. GALLOWAY, Chief of Bureau. 
BACTERIOLOGICAL STUDIES OF THE SOILS OF 
THE TRUCKEE-CARSON IRRIGATION 
PROJ ECT. : 
BY 
KARL F. KELLERMAN, 
Physiologist in Charge of Soil-Bacteriology and Water-Purification Investigations, 
AND 
EK. R. ALLEN, 
Scientific Assistant. 
IssuED ApriL 15, 1911. 
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