7 C V ?/ $ 
CONTENTS 
True Nature of Spinach-Blight and the Relation of Insects to Its Page 
Transmission. J. A. McClintock and Loren B. Smith . i 
Influence of Gypsum upon the Solubility of Potash in Soils. Paul, 
R. McMiller. 61 
Correlation between the Percentages of Fat in Cow's Milk and the 
Yield. Elmer Roberts... 67 
Contribution to the Knowledge of Toxoptera graminum in the 
South. Philip Luginbill and A. H. Beyer. 97 
Can Biologic Forms of Stemrust on Wheat Change Rapidly Enough 
to Interfere with Breeding for Rust Resistance ? E. C. Stakman, 
John H. Parker, and F. J. Piemeisel . in 
Mineral Content of Southern Poultry Feeds and Mineral Require¬ 
ment of Growing Fowls. B. F. Kaupp. ... 125 
Female Lepidoptera at Light Traps. W. B. Turner. 135 
A Comparative Study of Salt Requirements for Young and for 
Mature Buckwheat Plants in Solution Cultures. John W. 
Shive and William H. Martin.... 151 
Composition and Digestibility of Sudan-Grass Hay. W. G. 
Gaessler and A. C. McCandlish .. 176 
Water-Holding Capacities of Bedding' Materials for Live Stock, 
Amounts Required to Bed Animals, and Amounts of Manure 
Saved by Their Use. J. W. Whisenand. 187 
Two Important Introduced Parasites of the Brown-Tail Moth. 
C. F. W. Muesebeck... 191 
A Hitherto-Unreported Disease of Okra. L. L. Harter. 207 
Potato-Stem Lesions. H. A. Edson and M. Shapovalov. 213 
Anatomy of the Potato Plant, with Special Reference to the Onto¬ 
geny of the Vascular System. Ernst F. Artschwager. 221 
Improved Methods of Immunization Against Symptomatic An¬ 
thrax (Blackleg). R. A. KELSER.. 253 
Concentration of Symptomatic Anthrax (Blackleg) Toxin. 
William N. Berg. 263 
Soil Reaction and the Growth of Azotobacter. P. L. Gainey. ... 265 
Effect of Different Oxygen Pressures on the Carbohydrate Meta¬ 
bolism of the Sweet Potato. Heinrich Hasselbring. 273 
Influence of Humidity Upon the Strength and the Elasticity of 
Wool Fiber. J. I. Hardy. 285 
Availability of Potash in Some Common Soil-Forming Minerals 
and Effect of Lime Upon Potash Adsorption by Different 
Crops. J. K. Plummer. 297 
Influence of Reaction on Nitrogen-Assimilating Bacteria. E. B. 
Fred* and Audrey Davenport. 317 
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