IV Journal of Agricultural Research voi. iv 



Page 



A Contribution to the Life History of Spongospora Subterranea. 



L. O. KuNKEL 265 



Rheosporangium Aphanidermatum, a New Genus and Species of 



Fungus Parasitic on Sugar Beets and Radishes. H. A. Edson . . 279 

 Heredity of Color in Phlox Drummondii. Arthur W. Gilbert. . 293 



Asparagus-Beetle Egg Parasite. F. A. Johnston 303 



Inheritance of Certain Characters of Grapes. U. P. Hedrick and 



R. D. Anthony 315 



Ascochyta Clematidina, the Cause of Stem-Rot and Leaf-Spot of 



Clematis. W. O. Gloyer 331 



Methods of Bacterial Analyses of Air. G. L. A. RuehlE 343 



Wallrothiella Arceuthobii. James R. Weir 369 



Tensile Strength and Elasticity of Wool. Robert F. Miller 



and William D. Tallman 379 



Influence of Hybridization and Cross-Pollination on the Water 



Requirement of Plants. Lyman J. Briggs and H. L. Shantz. . 391 

 Further Studies of the Embryology of Toxoptera Graminum. 



W. J. Phillips 403 



Prickly-Pears as a Feed for Dairy Cows. T. E. Woodward, W. F. 



Turner, and David Griffiths 405 



A Nasturtium Wilt Caused by Bacterium Solanacearum. Mary 



K. Bryan 451 



Phosphorus Metabolism of Lambs Fed a Ration of Alfalfa Hay, 



Com, and Linseed Meal. E. L. Ross, M. H. Keith, and H. S. 



Grindley 459 



A Bacterial Disease of Lettuce. Nellie A. Brown 475 



Degree of Resemblance of Parents and Offspring with Respect to 



Birth as Twins for Registered Shropshire Sheep. H. L. RiETz 



and Elmer Roberts 479 



Soil Protozoa. George P. Koch 511 



Tylenchus Similis, the Cause of a Root Disease of Sugar Cane and 



Banana. N. A. Cobb 561 



Index 569 



