﻿ORGANIZATION OF THE UNITED STATES DEPARTMENT OF 

 AGRICULTURE. 



Secretary of Agriculture Henet G. Wallace. 



Assistant Secretary C. W. Pitgsley. 



Director of Scientific Work E. D. Ball. 



Director of Regulatory Work . 



Weather Bureau Charles F. Marvin, Chief. 



Bureautof 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 Chie f. 



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 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, Chairman. 



Packers and Stockyards Administration 1 Chester Morrill, Assistant to the 



Grain Future Trading* Act Administration—} Secretary. 



Office of the Solicitor :_. R. W. Williams, solicitor. 



This Bulletin is a contribution from the — 



Forest Service William B. Greeley, Forester. 



Branch of Research Earle H. Clapp, Asst. Forester. 



Forest Products Laboratory Carltle P. Winslow, Director. 



Section of Timber Physics Rolf Thelen, in charge. 



