Vol. XX DECEMBER 15, 1920 No. 6 



JOURNAL OF 



AGRICULTURAL 

 RESEARCH 



CONTENTS 



Page 



Carbon-Dioxid Content of Barn Air - 405 



MARY F. HENDRY and ALICE JOHNSON 



(Contribution from New Hampshire Agricultural Experiment Station) 



Rice Weevil (Calandra), Sitophilus orza - - - - 409 



RICHARD T. COTTON 



( Contribution from Bureau of Entomology ) 



Opius fletcheri as a Parasite of the Melon Fly in Hawaii - 423 



H. F. WILLARD 



( Contribution from Bureau of Entomology ) 



Tamarind Pod-Borer, Sitophilus linearis (Herbst) - - 439 



RICHARD T. COTTON 



( Contribution from Bureau of Entomology ) 



Influence of Temperature and Humidity on the Growth 

 of Pseudomonas citri and Its Host Plants and on In- 

 fection and Development of the Disease - 447 



GEORGE L. PELTIER 



(Contribution from Alabama Agricultural Experiment Station) 



Daubentonia longifolia (Coffee Bean), A Poisonous Plant - 507 



C. DWIGHT MARSH and A. B. CLAWSON 



( Contribution from Bureau of Animal Industry ) 



PUBLISHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE, 



WITH THE COOPERATION OF THE ASSOCIATION OF 



LAND-GRANT COLLEGES 



WASHINGTON, D. C. 



WA8HINOTOM : OOVEBNMENT PRINTINQ OFFICE : f»M 



