ORGANIZATION OF THE UNITED STATES DEPARTMENT OF AGRICULTURE 

 WHEN THIS PUBLICATION WAS LAST PRINTED 



Secretary of Agriculture Abthtjh M. HYca 



Assistant Secretary R. W. Dunlap. 



Director of Scientific Work A. F. Woods. 



Director of Regulatory Wof^k W. G. Campbeix. 



Director of Extension Wo7^k C. W. Warbueton. 



Director of Personnel and Business Adminis- W. W. Stockbergeb. 

 tration. 



Director of Information M. S. Eisehi^howeiec. 



Solicitor E. L. Marshaix. 



Weather Bureau Charles F. Marvin, Chief. 



Bureau of Animal Industry John R. Mohler, Chief. 



Bureau of Daii'y Industry O. E. Reed, Chief. 



Bureau of Plant Industry WnxiAM A. Taylor, Chief. 



Forest Service R. Y. Sttjaet, Chief. 



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



Bureau of Entomology C. L. Marlatt, Chief. 



Bureau of Biological Survey Paul G. Redington, Chief. 



Bureau of Public Roads Thomas H. MaoDonald, Chief. 



Bureau of Agricultural Efigineerlng S. H. McCrory, Cliwf- 



Bureau of Agricultural Economics Nils A, Olsen, Chief. 



Bureau of Home Economics Lotjisb Stanley, Chief, 



Plant Quarantine and Control Administration^ Lee A. Strong, Chief. 



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



Food and Drug Administration Walter G. Campbeill, Director 



of Regulatory Work, in Ohah^ge^ 



Office of Experiment Stations , Chief. 



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



Library Claribel R. Baenett, Librarian. 



This circular is a contribution from 



Forest Service R. Y. Stuart, Chief. 



Branch of Research Earl H. Clapp, Assistant For- 

 ester, in Charge. 

 Division of Range Research W. R. Chapline, Chief. 



V. S. GOVERNMENT PRINTING OFFICE: 1931 



For sale by the Superintendent of Documents, Washington, D. C. Price 15 cents 



