LETTER OE TRANSMITTAL 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF SOILS, 

 Washington, D. C., October 16, 1912. 



SIR: I have the honor to transmit the manuscript of an article on 

 the Organic Constituents of Soils, by Dr. Oswald Schreiner, scientist 

 in charge of soil fertility investigations of this bureau, and to recom- 

 mend that it be published as Circular No. 74 in the series issued by 

 the Bureau of Soils. 



Very respectfully, 



MILTON WHITNEY, 



Chief of Bureau. 

 Hon. JAMES WILSON, 



Secretary of Agriculture. 



