ORGANIZATION OF THE UNITED STATES DEPARTMENT OF AGRICULTURE 
WHEN THIS PUBLICATION WAS LAST PRINTED 
SCGhCLOTAYL Of AGTHICGULLUT. = === a ____. Hernry A. WALLACE. 
SU MOCT AS CCR CEOTA eee ada 5 enna aan ace eet Ne REXFORD G. TUGWELL. 
Assistant Secretary______ £4 ee Me Wilke SONe 
Director of Extension Work ______ _ C. W. WARBURTON. 
Director of Finance____ eee rhe FE Ae W. A. JUMP. 
Director of information=——. > 2a Me S| RISEN HOWER: 
Dit CClLOTLOTPECTS ONC aaa ee a ee W. W. STOCKBERGER. 
Director of Research ___ e: kee ESS JAMES Ee ARD UNI: 
S OUCH OTSE EE ere mh ah ee Cee apes es ae MAsTIN G. WHITE. 
Agricultural Adjustment Administration ~__. H. R. ToLtitEy, Administrator. 
Bureau of Agricultural Economies —~ ~~ ~_____ A. G. BLAcK, Chief. 
Bureau of Agricultural Engineering____—-__— S. H. McCrory, Chief. 
Burcot ojaeAnimal industriya2 = JOHN R. MOHLER, Chief. 
BUreow of Biological Survey. Ira N, GABRIELSON, Chief. 
Bureau of Chemistry and Soils ___________-~- Henry G. Knicut, Chief. 
Commodity Exchange Administration__—~~—_ J. W. DuveEL, Chief. 
BULCGUO fa DOTY ANOUS UY = eee ee O. E. REED, Chief. 
Bureau of Entomology and Plant Quarantine- Lr A. STRONG, Chief. 
Ojjice of Haperiment-Stations=_- 2s 2= == JAMES T. JARDINE, Chief. 
Hood and Drug Administration ——- 9s WALTER G. CAMPBELL, Chief. 
FIOGCSteS ChUICe 2 == oe EERDINAND EAL, SILCOx CHiele 
Burew. of Home Hcoonomics.== => LOUISE STANLEY, Chief. 
| ROY ROT ci) eageeiciar te MURR E RANG EAM eM eh ahg es ae CLARIBEL R. BARNETT, Librarian. 
Bureau of Plant Industry —~___- 52) WREDERICKED. RICHiYe Clie 
BURCOMLO, _EULDNG ROC Ss eee ee THomMAsS H. MAacDonatp, Chief. 
Soil Conservation Service___— Soe) HHS Benner Omer 
WiC RCE RULE OU ae Sa eee es eee Wiis R. Greece, Chief. 
This circular is a contribution from 
Bureau of Biological Survey___--—____ IRA N. GABRIELSON, Chief. 
12 
U.S. GOVERNMENT PRINTING OFFICE: 1936 
For sale by the Superintendent of Documents, Washington, D. C. - - - - - - Price 5 cents 
