L/3-,3^ ^* 
^QHAM/VII agricultural experiment station, 
J J. M. WESTGATE, Agronomist in Charge. 
Bulletin No. 39. 
THE BIOCHEMICAL DECOMPOSITION OF 
NITROGENOUS SUBSTANCES 
IN SOILS. 
LIB. 
NTS OEPT. 
U.S. DEPOSITORY 
W. P. KELLEY, 
Chemist. 
UNDER THE SUPERVISION OF 
STATES RELATIONS SERVICE. 
U, S. DEPARTMENT OF AGRICULTURE. 
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