Apr. 3-sept. 25, 1916 Contents 



Page 



Larval Characters and Distribution of Two Species of Diatraea. 

 T. E. Hollow AY 62 1 



The Disease of Potatoes Known as "Leak." Lon A. Hawkins. . 627 



Digestibility of Hard Palates of Cattle. C. F. Langworthy and 

 A. D. Holmes 641 



Some Properties of the Virus of the Mosaic Disease of Tobacco. 



H. A. Allard 649 



Life Cycles of the Bacteria. F. Lohnis and N. R. Smith 675 



A Respiration Calorimeter, Partly Automatic, for the Study of 

 Metabolic Activity of Small Magnitude. C. F. Langworthy 

 and R. D. Milner 703 



Mottle-Leaf of Citrus Trees in Relation to Soil Conditions. Ly- 

 man J. Briggs, C. a. Jensen, and J. W. McLane 721 



Vegetative Succession Under Irrigation. J. Francis Macbride. . 741 



Agricultural Value of Impermeable Seeds. George T. Har- 

 rington 761 



Mendelism of Short Ears in Sheep. E. G. Ritzman 797 



Life-History Studies of Cirphis Unipuncta, the True Army Worm. 

 John J. Davis and A. F. Satterthwait 799 



Infection of Timothy by Puccinia graminis. E. C. Stakman and 



F. J. PiemeisEL 813 



Control of the Powdery Dryrot of Western Potatoes Caused by 



Fusarium trichothecioides. O. A. Pratt 817 



Use of the Moisture Equivalent for the Indirect Determination of 

 the Hygroscopic Coefficient. Frederick J. Alway and 

 JOUETTE C. RUSSEL 833 



Thersilochus conotracheli, a Parasite of the Plum Curculio. R. 



A; CUSHMAN 847 



Effect on Plant Growth of Sodium Salts in the Soil. Frank B. 



Headley, E. W. Curtis, and C. S. Scofield 857 



Observations on the Life History of the Army Cutworm, Chori- 



zagrotis auxiliaris. R. A. Cooley 871 



Aphidoletes meridionalis, an Important Dipterous Enemy of 



Aphids. John J. Davis 883 



Influence of Barnyard Manure and Water upon the Bacterial 



Activities of the Soil. J. E. Greaves and E. G. Carter 889 



Progressive Oxidation of Cold-Storage Butter. D. C. Dyer 927 



Bacteriological Studies of a Soil Subjected to Different Systems 



of Cropping for Twenty-five Years. P. L. Gainey and W. M. 



GiBBS 953 



Studies on the Physiology of Reproduction in the Domestic Fowl. — 



XV. Dwarf Eggs. Raymond Pearl and Maynie R. Curtis. . 977 

 a-Crotonic Acid, a Soil Constituent. E. H. Walters and Louis 



E. Wise 1043 



Index 1047 



