ORGANIZATION OF THE U. S. DEPARTMENT OF AGRICULTURE. 
Secretary of Agriculture Henry C. Wallace. 
Assistant Secretary C. W. Pugsley. 
Director of Scientific Work E. D. Ball. 
Director of Regulatory Work 
Weather Bureau Charles F. Marvin, Chief. 
Bureau of Agricultural Economics Henry' C. Taylor, Chief. 
Bureau of Animal Industry John R. Mohler, Chief. 
BureauPof Plant Industry William A. Taylor, Chid. 
Forest Service W. B. Greeley, Chief. 
Bureau of Chemistry Walter G. Campbell, Acting 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.. 
Fixed Nitrogen Research Laboratory F. G. Cottrell, Director. 
Division of Accounts and Disbursements. A. Zappone, Chief. 
Division of Publications Edwin C. Powell, Acting Chief. 
Library Claribel R. Barnett, Librarian. 
States Relations Service A. C. True. Director. 
Federal Horticultural Board C. L. Marlatt, Chairman. 
Insecticide and Fungicide Board J. K. Haywood, Chairman. 
Packers and Stockyards Administration J Chester Morrill, Assistant to the 
Grain Future Trading Act Administra Hon _j Secretary. 
Office of the Solicitor R. W. Williams, Solicitor. 
This bulletin is a contribution from 
Bureau of Chemistry Walter G. Campbell. Acting Chief. 
Microchemical Laboratory B. J. Howard, in charge. 
Insecticide and Fungicide Board J. K. Haywood. Chairman. 
10 
\ : GOVERNMENT PRINTING OFFICE : 1923 
