JOURNAL OF 



AGRICULTURAL 

 RESEARCH 



CONTENTS 



Pag© 



Use of the Moisture Equivalent for the Indirect Determi- 

 nation of the Hygroscopic Coefficient - 833 



FREDERICK J. ALWAY and JOUETTE C. RUSSEL 



Thersilochus conotracheli, a Parasite of the Plum Curculio 847 



R. A. CUSHMAN 



Effect on Plant Growth of Sodium Salts in the Soil - - 857 

 FRANK B. HEADLEY, E. W. CURTIS, and C. S. SCOFIELD 



DEPARTMENT OF AGPJCULTURE 



WASHINGTON, D.C. 



WASHINGTON : GOVERNMENT PRINTING OFFICE : t»H 



