ORGANIZATION OF THE UNITED STATES DEPARTMENT OF AGRICULTURE 

 WHEN THIS PUBLICATION WAS LAST PRINTED 



Secretary of Agriculture Henry A. Wallace. 



Under Secretary M. L. Wilson. 



Assistant Secretary Harry L. Brown. 



Coordinator of Land Use Planning and Direc- M. S. Eisenhower. 

 tor of Information. 



Director of Extension Work C. W. Warburton. 



Director of Finance W. A. Jump. 



Director of Personnel Roy F. Hendrickson. 



Director of Research James T. Jardine. 



Solicitor Mastin G. White. 



Agricultural Adjustment Administration H. R. Tolley, Administrator. 



Bureau of Agricultural Economics A. G. Black, Chief. 



Bureau of Agricultural Engineering S. H. McCrory, Chief. 



Bureau of Animal Industry John R. Mohler, Chief. 



Bureau of Biological Survey Ira N. Gabrielson, Chief. 



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



Commodity Exchange Administration J. W. T. Duvel, Chief. 



Bureau of Dairy Industry O. E. Reed, Chief. 



Bureau of Entomology and Plant Quarantine- _ Lee A. Strong, Chief. 



Office of Experiment Stations James T. Jardine, Chief. 



Farm Security Administration W. W. Alexander, Administrator. 



Food and Drug Administration Walter G. Campbell, Chief. 



Forest Service Ferdinand A. Silcox, Chief. 



Bureau of Home Economics Louise Stanley, Chief. 



Library Claribel R. Barnett, Librarian. 



Bureau of Plant Industry E.G. Auchter, Chief. 



Bureau of Public Roads Thomas H. MacDonald, Chief. 



Soil Conservation Service H. H. Bennett, Chief. 



Weather Bureau F. W. Reichelderfer, Chief. 



This publication is a contribution from 



Bureau of Plant Industry E. C. Auchter, Chief. 



Division of Fruit and Vegetable Crops and H. P. Gould, Principal Pomologist, 

 Diseases. in Charge. 



27 



^ 



U. S. GOVERNMENT PRINTING OFFICE: 1939 



