ORGANIZATION OF THE 
UNITED STATES DEPARTMENT OF AGRICULTURE. 
January 9, 1926. 
Secretary of Agriculture W. M. Jardine. 
Assistant Secretary R. W. Dunlap. 
Director of Scientific Work 
Director of Regulatory Work Walter G. Campbell. 
Director of Extension Work C. W. Warburton. 
Director of Information Nelson Antrim Crawford. 
Director of Personnel and Business Adminis- 
tration W. W. Stockberger. 
Solicitor R. W. Williams. 
Weather Bureau Charles F. Marvin, Chief. 
Bureau of Agricultural Economics Thomas P. Cooper, Chief. 
Bureau of Animal Industry John R. Mohler, Chief. 
Bureau of Plant Industry Yv t illiam A. Taylor, Chief. 
Forest Service W. B. Greeley, Chief. 
Bureau of Chemistry C. A. Browne, Chief. 
Bureau of Soils Milton Whitney, Chief. 
Bureau of Entomology L. O. Howard, Chief. 
Bureau of Biological Survey E. W. Nelson, Chief. 
Bureau of Public Roads Thomas H. MacDonald, Chief. 
Bureau of Home Economics Louise Stanley, Chief. 
Bureau of Dairying C. W. Larson, Chief. 
Fixed Nitrogen Research Laboratory F. G. Cottrell, Director. 
Office of Experiment Stations E. W. Allen, Chief. 
Office of Cooperative Extension Work C.B. Smith, Chief. 
Library Claribel R. Barnett, Librarian. 
Federal Horticultural Board C. L. Marlatt, Chairman. 
Insecticide and Fungicide Board J. K. Haywood, Chairman. 
Packers and Stockyards Administration John T. Caine, in Charge. 
Grain Futures Administration J. W. T. Dtjvel, in Charge. 
This bulletin is a contribution from 
Bureau of Public Roads Thomas H. MacDonald, Chief. 
Division of Agricultural Engineering S. H. McCrory, Chief. 
ADDITIONAL COPIES 
OF THIS PUBLICATION MAY BE PROCURED FROM 
THE SUPERINTENDENT OF DOCUMENTS 
GOVERNMENT PRINTING OFFICE 
WASHINGTON, D. C. 
AT 
25 CENTS PER COPY 
V 
