ORGANIZATION OF THE 
UNITED STATES DEPARTMENT OF AGRICULTURE. 
January 16, 1924. 
Secretary of Agriculture: HENRY C. WALLACE, 
ASSISTS CCVCUOTUY 2S 22 ta SU Ty ea ek ee Howarp M. GORE, 
Director of: Scientific Works ssi) oh oN E. D. BALL. 
- Director of Reguiatory Work 2222s WALTER G. CAMPBELL, 
Director of Extension Work_______________- ©. W. WARBURTON. 
OTUCTRO MSs Vig. ieels ney Slee apy dhs be a hh aie R. W..WILLIAMS. 
Weather’ BuUreG so ws el Bees ae eee, pe CHARLES F.. MARVIN, Chief. 
Bureau of Agricultural Hconomics_______-____ HENRY C. TAytor, Chief. 
Bureau of Animal Industry_____-__-.-- JOHN R. MoHLeER, Chief. 
Bureau of Plant Lidwstrysiciss ye Se Pee ee WIitiiAm A. TAyYtor, Chief. 
HIOGES eS CTANCE = tI ee ee a rg W. B. GREELEY, Chief. 
Barcuu of -Chenvstrae ste eles ee SP aes EF C. A. BROwNE, Chief. 
BUTCOUAOF SOtise: Lesaee i sii oe gs le ets ous MILTON WHITNEY, Chief. 
BULCOW OF ENTOMOLOGY 28 858 ere ON ee L. O. Howarp, Chief. 
Bureau of Biological Survey_____-_-----__-- E. W. NELSON, Chief. 
Burewbhof Pwelc Roadsay salt Ww ate 4s THoMAS H. MACDONALD, Chief. 
Bureau of Home Foonomics._2=. ~~ — 22-4 LOUISE STANLEY, Chief. 
Office of Experiment Stations_______________ BE. W. ALLEN, Chief. 
Fixed Nitrogen Research Laboratory________ F. G. COTTRELL, Director. 
PU OUIC OOS Aes 5 hey tt fh POR re Peed ee L. J. HAyYNEs, In Charge. 
TORT TS SORE PR Fee a OURe Die ae ee aes CLARIBEL R. BARNETT, Librarian. 
Hederat Horticultural Board 22- ae ah C. L. MAruattT, Chairman. 
Insecticide and Fungicide Board____________ J. K. HAywoop, Chairman. 
Packers and Stockyards Administration____} CHESTER MorriILi, Assistant to 
Grain Future Trading Act fie Gael the Secretary. 
This bulletin is a contribution from 
Bureawof Plant Industry. 33-22 5 = WititraAm A. TaAytor, Chief. 
Office of Fruit-Disease Investigations____ MERTON B. WAITE, Pathologist in 
Charge. 
22 
ADDITIONAL COPIES 
OF THIS PUBLICATION MAY BE PROCURED FROM 
THE SUPERINTENDENT OF DOCUMENTS 
GOVERNMENT PRINTING OFFICE 
WASHINGTON, D. C, 
AT 
10 CENTS PER COPY 
V 
