Vol. IV JTJNK, 1915 No. 3 



JOURNAL OF 



AGRICULTURAL 

 RESEARCH 



CONTENTS 



Paga 



Relation Between Puccinia Graminis and Plants Highly 

 Resistant to Its Attack - - - - - - - 193 



E. C. STAKMAN 



Antagonism Between Anions as Affecting Barley Yields on 

 a Clay-Adobe Soil 201 



CHARLES B. LIPMAN and W. F. GERICKE 

 A New Wheat Thrips - > - - - - - - 219 



E. O. G. KELLY 



Cytological Studies of Azotobacter Chroococctim - - 225 



AUGUSTO BONAZZI 



Influence of Soil Moisture upon the Rate of Increase in 

 Sugar-Beet Root-Louse Colonies ----- 241 



J. R. PARKER 



A New Leaf and Twig Disease of Picea Engelmanni - - 251 



JAMES R. WEIR 



Some Sugar-Cane Root-Boring Weevils of the West Indies 255 

 W. DWIGHT PIERCE 



A Contribution to the Life History of Spongospora Subter- 

 ranea ---------- 265 



L. O. KUWKEL 



DEPARTMENT OF AGRICULTURE 



WASHINGTON, DX. 



WASHINdTON : aOVERNMENT PRINTINQ OFFICE I 1916 



