IV Journal of Agricultural Research voi. xviii 



Page 



Cotton Rootrot Spots. C. S. Scofield 305 



Apple-Grain Aphis. A. C. Baker and W. F. Turner 311 



Sunflower Silage. R. E. Neidig and Lueu E. Vance 325 



Effect of Oxidation of Sulphur in Soils on the Solubility of Rock 



Phosphate and on Nitrification. O. M. Shedd 329 



Effect of Lime upon the Sodium-Chlorid Tolerance of Wheat 



Seedlings. J. A. LeClERC and J. F. BreazEale 347 



Relation of Moisture in Solid Substrata to Physiological Salt 

 Balance for Plants and to the Relative Plant-Producing Value 

 of Various Salt Proportions. John W. Shive 357 



Treatment of Cereal Seeds by Dry Heat. D. Atanasoff and A. 



G. Johnson 379 



Meat Scraps versus Soybean Proteins as a Supplement to Com 

 for Growing Chicks. A. G. Philips, R. H. Carr, and D. C. 

 Kennard 391 



Further Studies of Sorosporella uvella, a Fungous Parasite of 



Noctuid Larvae. A. T. SpEare 399 



Work and Parasitism of the Mediterranean Fruit Fly in Hawaii 



during 1918. H. F. Willard 441 



Cyanogenesis in Sudan Grass : A Modification of the Francis-Con- 

 nell Method of Determining Hydrocyanic Acid. Paul Menaul 

 and C. T. DowELL 447 



European Frit Fly in North America. J. M. Aldrich 451 



Lepidoptera at Light Traps. W. B. Turner 475 



Life History of Eubiomyia calosomae, a Tachinid Parasite of 

 Calosoma Beetles. C. W. Collins and Clifford E. Hood... . 483 



Determination of Normal Temperatures by Means of the Equa- 

 tion of the Seasonal Temperature Variation and a Modified 

 Thermograph Record. F. L. WEST, N. E. EdlEFSEn, and 

 S. EwiNG 499 



Temperature Relations of Certain Potato-Rot and Wilt-Produc- 

 ing Fungi. H. A. Edson and M. Shapovalov 511 



Germination of Barley Pollen. Stephen Anthony and Harry 

 V. Harlan 525 



Invertase Activity of Mold Spores as Affected by Concentration 

 and Amount of Inoculum. Nicholas Kopeloff and S. 

 Byall 537 



Basal Glumerot of Wheat. Lucia McCulloch 543 



Effect of the Relative Length of Day and Night and Other Factors 

 of the Environment on Growth and Reproduction in Plants. 

 W. W. Garner and H. A. Allard 553 



Index 607 



