CONTENTS 



Page 



Notes on the Composition of the Sorghum Plant. J. J. Willa- 



MAN, R. M. West, D. O. Sprie;stersbach, and G. E. H01.M i 



Simple Method for Measuring the Acidity of Cereal Products : Its 

 Application to Sulphured and Unsulphured Oats. Victor 

 BiRCKNER 33 



Rate of Absorption of Soil Constituents at Successive Stages of 



Plant Growth. John S. Burd 51 



Relation of the Concentration and Reaction of the Nutrient Me- 

 dium to the Growth and Absorption of the Plant. D. R. Hoag- 

 LAND 73 



Natural Carbonates of Calcium and Magnesium in Relation to the 

 Chemical Composition, Bacterial Contents, and Crop-Producing 

 Power of Two Very Acid Soils. S. D. Conner and H. A. NoVES. 119 



Recent Studies on Sclerotium rolfsii Sacc. J. J. Taubenhaus. ... 127 



Effect of Variation in Moisture Content on the Water- Extractable 



Matter of Soils. J. C. Martin and A. W. Christie 139 



Pathology of Dourine with Special Reference to Microscopic 

 Changes in Nerve Tissues and Other Structures. Robert J. 

 FoRMAD 145 



Yellow-Berry in Hard Winter Wheat. Herbert F. Roberts. . . 155 



Note on the European Corn Borer (Pyrausta nubilalis Hiibner) and 

 Its Nearest American Allies, with Description of Larvae, Pupae, 

 and One New Species. Carl Heinrich 171 



Bacterial Blight of Soybean. Florence M. Coerper 179 



Do Mold Spores Contain Enzyms? Nicholas KopEloff and 

 Lillian Kopeloff 195 



Nature and Control of Apple-Scald. Charles Brooks, J. S. 



CooLEY, and D. F. Fisher 211 



Nitrogen Metabolism of Two-Year-Old Steers. SlEETEr Bull 



and H. S. GrindlEy 241 



Development of the Pistillate Spikelet and Fertilization in Zea 

 mays L. Edwin C. Miller 255 



Response of Citrus Seedlings in Water Cultures to Salts and Or- 

 ganic Extracts. J. F. BreazealE ' 267 



Physiological Study of the Parasitism of Pythium debaryanum 

 Hesse on the Potato Tuber. Lon A. Hawkins and Rodney B. 

 Harvey 275 



Losses of Organic Matter in Making Brown and Black Alfalfa. 



C. O. Swanson, L. E. Call, and S. C. Salmon 299 



(HI) 



