ORGANIZATION OF THE UNITED STATES DEPARTMENT OF 
AGRICULTURE. 
Secretary of Agriculture Henry C. Wallace. 
Assistant Secretary C. W. Pttgsley. 
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. 
Bureau of Plant Industry William A. Taylor, Chief. 
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 Surrey 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 John L. Cobbs, Jr., 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, Chairmun. 
Packers and Stockyards Administration_.\CiiES r iEB Morrill, 
Grain Future-Trading Act Administration / Assistant to the Secretary. 
Office of the Solicitor R. W. Williams, Solicitor. 
This bulletin is a contribution from — 
Bureau of Plant Industry William" A. Taylor, Chief; 
Office of Cereal Investigations Carleton R. Ball, 
Cerealist in Charge. 
18 
ADDITIONAL copies 
OF THIS PUBLICATION" MAY BE PROCURED FROM 
THE SUPERINTENDENT OF DOCUMENTS 
GOVERNMENT PRINTING OFFICE 
WASHINGTON, D. C. 
AT 
10 CENTS PER COPY 
WASHINGTON : GOVERNMENT PRINTING OFFICE : 1922 
