VI Journal of Agricultural Research ' voi. v 



Page 



Some Factors Influencing the Longevity of Soil Micro-organisms 

 Subjected to Desiccation, with Special Reference to Soil Solu- 

 tion. Ward Giltner and H. Virginia Langworthy 927 



Observations on the Life History of the Cherry Leaf Beetle. 

 Glenn W. Herrick and Robert Matheson 943 



Apparatus for Measuring the Wear of Concrete Roads. A. T. 



GoLDBECK 951 



Morphology and Biology of the Green Apple Aphis. A. C. Baker 



and W. F. Turner 955 



Soilstain, or Scurf, of the Sweet Potato. J. J. Taubenhaus 995 



An Asiatic Species of Gymnosporangium Established in Oregon. 



H. S. Jackson 1003 



Relation of Stomatal Movement to Infection by Cercospora 



beticola. Venus W. Pool and M. B. McKay ion 



A Method of Correcting for Soil Heterogeneity in Variety Tests. 



Frank M. Surface and Raymond Pearl 1039 



Flow through Weir Notches with Thin Edges and Full Contrac- 

 tions. V. M. Cone 1051 



Identity of Eriosoma pyri. A. C. Baker 1115 



A New Penetration Needle for Use in Testing Bituminous Mate- 

 rials. Charles S. Reeve and Fred P. Pritchard 1121 



A New Irrigation Weir. V. M. Cone 1 127 



Inheritance of Fertility in Swine. Edward N. Wentworth and 



C. E. AuBEL H45 



Relation of Green Manures to the Failure of Certain Seedlings. 



E. B. Fred 1161 



A New Spray Nozzle. C. W. Woodworth 1 177 



A New Interpretation of the Relationships of Temperature and 



Humidity to Insect Development. W. Dwight Pierce 1183 



Index 1193 



