JOINT COMMITTEE ON POLICY AND MANUSCRIPTS 



FOE THE UNITED STATES DEPAETMENT FOE THE ASSOCIATION OF lAND-GEANT 

 OF AGEICUITUEE COIIEGES AND UNIVEESITIES 



H. G. KNIGHT, Chairman S. W. FLETCHER 



aief, Bureau „/ CKerai^ry a^ Soil, ^S^af^f/ZS^i.fS'^"''' ^"^ 



F. L. CAMPBELL S. B. DOTEN 



ETUomolosjist, Bureau of Eittomology Director, Nevada Agricultural Experiment 



Station 



JOHN W. ROBERTS C. G. WILLIAMS 



Senior Patkologiat, Bureau of Plard Director, Ohio Agricultural Experiment 



Iniuetry Station 



EDITOEIAL SUFEEVISION 



M. C. MERRILL 



Chief of Publicatiom, United States Departmem. of Agriculture 



Articles for publication in the Journal must bear the formal approval of the 

 chief of the department bureau or of the director of the experiment station from 

 which the paper emanates. Each manuscript must be accompanied by a state- 

 ment that it has been read and approved by one or more persons (named) familiar 

 with the subject. The data as represented by tables, graphs, summaries, and 

 conclusions must be approved from the statistical viewpoint by someone (named) 

 competent to judge. All computations should be verified. 



Station manuscripts and correspondence concerning them should be addressed 

 to S. W. Fletcher, Director of Research, Pennsylvania Agricultural Experiment 

 Station, State College, Pa. 



PubUshed on the first and fifteenth of each month. This volume will consist of 

 twelve numbers and the Contents and Index. 



Subscription price: 



Entire Journal: Domestic, $2.25 a year (2 volumes) 



Foreign, $3.50 a year (2 volumes) 

 Single numbers: Domestic, 10 cents 

 Foreign, 15 cents 



Articles appearing in the Journal are printed separately and can be obtained 

 by purchase at 5 cents a copy domestic; 8 cents foreign. If separates are desired 

 in quantity, they should be ordered at the time the manuscript is sent to the 

 printer. Address all correspondence regarding subscriptions and purchase of 

 numbers and separates to the Superintendent of Documents, Government Printing 

 GflBce, Washington, D. C. 



