ORGANIZATION OF THE 
UNITED STATES DEPARTMENT OF AGRICULTURE. 
January 29, 1924. 
Secretary of Agriculture Henry C . Wallace . 
Assistant Secretary Howard M. Gore . 
Director of Scientific Work E. D. Ball. 
Director of Regulatory Work Walter G. Campbell. 
Director of Extension Work C. W. Warburtox. 
Solicitor R. W. Williams. 
Weather Bureau Charles F. Marvin, Chief. 
Bureau of Agricultural Economics Henry C. Taylor, Chief. 
Bureau of Animal Industry John II . Mohler, Chief. 
Bureau of Plant Industry William 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. 0. 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. 
Office of Experiment Stations E. W. Allen, Chief 
Fixed Nitrogen Research Laboratory F. G. Cottrell, Director. 
Publications L. J. Haynes, In Charge. 
Library Claribel R. Barnett, Librarian. 
Federal Horticultural Board C L. Marlatt, Chairman. 
Insecticide and Fungicide Board J. K. Haywood, Chairman. 
Packers and Stockyards Administration 1 Chester Morrill, Assistant to the 
Grain Future Trading Act Administration j Secretary. 
This bulletin is a contribution from 
Bureau of Soils Milton Whitney, Chief 
Investigations of Fertilizer Resources 
22 
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