JOINT COMMITTEE ON POLICY AND MANUSCRIPTS 



TOR THE UiriTED STATES DEPARTMENT FOE THE ASSOCIATIOIT OF LASfD-GEANT 



OF AGRICTJITURE COIIEGES AND UNIVERSITIES 



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



Chief, Bureau of Chemistry and Soils Director of Research, Pennsylvania Agri- 

 cultural Experiment Station 



F.L.CAMPBELL j y p.TT 



^lT?^,lf b^„";S^{''""'™''"""' ' director, Kansas AgricuUural Experiment 



and Plant Quarantine 



Station 



JOHN W. ROBERTS C. E. LADD 



Principal Pathologist, Bureau of Plant Director, New York {Cornell) Agricultural 



Industry Experiment Station 



EDITORIAI STTPEEVISION 



M. C. MERRILL 



Chief of Publications, United States Department 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 e.xperiment 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) famiUar 

 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 rnanuscripts and correspondence concerning them should be addressed 

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

 Station, State College, Pa. 



Published on the 1st and 15th of each month. This volume will consist of 12 

 numbers and the contents and index. 



Subscription price: 



Entire Journal: Domestic, $3.25 a year (2 volumes) 



Foreign, $4.75 a year (2 volumes) 

 Single numbers: Domestic, 15 cents 



Foreign, 20 cents 



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

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

 printer. Address all correspondence regarding subscriptions and purchase of 

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