ORGANIZATION OF THE UNITED STATES DEPARTMENT OF AGRICULTURE 

 WHEN THIS PUBLICATION WAS LAST PRINTED 



Secretary of Agriculture Henry A. Wallace. 



Assistant Secretary Rexford G. Tugwell. 



Director of Scientific Work A. F. Woods. 



Director of Extension Work C. W. W t arburton. 



Director of Personnel and Business Admin- W. W. Stockberger. 

 istration. 



Director of Information M. S. Eisenhower. 



Solicitor Seth Thomas. 



Bureau of Agricultural Economics Nils A. Olsen, Chief. 



Bureau of Agricultural Engineering S. H. McCrory, Chief. 



Bureau of Animal Industry John R. Mohler, Chief. 



Bureau of Biological Survey Paul G. Redington, Chief. 



Bureau of Chemistry and Soils H. G. Knight, Chief. 



Office of Cooperative Extension Work C. B. Smith, Chief. 



Bureau of Dairy Industry O. E. Reed, Chief. 



Bureau of Entomology Lee A. Strong, Chief. 



Office of Experiment Stations James T. Jardine, Chief. 



Food and Drug Administration Walter G. Camfbell, Chief. 



Forest Service Ferdinand A. Silcox, Chief. 



Grain Futures Administration J. W. T. Duvel, Chief. 



Bureau of Home Economics Louise Stanley, Chief. 



Library Claribel R. Barnett, Librarian. 



Bureau of Plant Industry William A. Taylor, Chief. 



Bureau of Plant Quarantine A. S. Hoyt, Acting Chief. 



Bureau of Public Roads Thomas H. McDonald, Chief. 



Weather Bureau Charles F. Marvin, Chief. 



Agricultural Adjustment Administration George N. Peek, Administrator. 



This circular is a contribution from 



Bureau of Chemistry and Soils H. G. Knight, Chief. 



Soil Investigations A. G. McCall, Chief. 



Division of Soil Survey C. F. Marbut, Principal Soil 



Scientist, in Charge. 

 30 



U.S. GOVERNMENT PRINTING OFFICE: 1933 



For sale by the Superintendent of Documents, Washington, D.C. 



Price 5 cents 



