CONTENTS 



Page 



Life History of Plutella maculipennis, the Diamond-Back Moth. 



H. O. Marsh i 



Daily Variation of Water and Dry Matter in the Leaves of Corn 



and the Sorghums. Edwin C. Miller ii 



A Neglected Factor in the Use of Nicotine Sulphate as a Spray. 



William Moore and Samuel A. Graham 47 



A New Disease of Wheat. Erwin F. Smith 51 



A Study of the Rate of Passage of Food Residues Through the 



Steer and Its Influence on Digestion Coefficients. P. V. Kwing 



and F. H. Smith 55 



A Further Contribution to the Study of Eriosoma pyricola, the 



Woolly Pear Aphis. A. C, Baker and W. M. Davidson 65 



MicrooBganisms and Heat Production in Silage Fermentation. 



O. W. Hunter 75 



Isolation of Cyanuric Acid from Soil. Louis E- Wise and E. H. 



Walters 85 



Family Performance as a Basis for Selection in Sheep. E. G. 



RiTzman and C. B. Davenport 93 



A Needle Blight of Douglas Fir. James R. Weir 99 



A Substittute for Litmus for Use in Milk Cultures. Wm. Mans- 

 field Clark and Herbert A. Lubs 105 



Movement and Distribution of Moisture in the Soil. F. S. Harris 



and H. W. Turpin 113 



A Colletotrichum Leafspot of Turnips. B. B. Higgins 157 



Black Rootrot of the Apple. F. D. Fromme and H. E. Thomas. 163 

 Physiological Effect on Growth and Reproduction of Rations 



Balanced from Restricted vSources. E. B. Hart, E. V. 



McCoLLUM, H. Steenbock and G. C. Humphrey 175 



Toxic Values and Killing Efficiency of the Arsenates. A. L. 



LovETT and R. H. Robinson i99 



Evaporation from the Surfaces of Water and River-Bed Materials. 



R. B. Sleight 209 



Influence of Grading on the Value of Fine Aggregate Used in 



Portland Cement Concrete Road Construction. F. H. Jackson, 



JR 263 



Chemical Studies in Making Alfalfa Silage. C. O. Swanson and 



E. L. Tague 275 



Studies on Oat Breeding— V: The F^ and Fj Generations of a 



Cross Between a Naked and a Hulled Oat. Jacob Zinn and 



Frank M. Surface ^93 



jii 



