CONTENTS 



Page 



Relation of Carbon Bisulphid to Soil Organisms and Plant Growth. 



E. B. Fred i 



Climatic Conditions as Related to Cercospora beticola. Venus 



W. Pooiv and M. B. McKay 21 



Soluble Nonprotein Nitrogen of Soil. R, S. Potter and R. S. 



Snyder 61 



Oviposition of Megastigmus spermotrophus in the Seed of Douglas 



Fir. J. M. Miller 65 



Citrus Canker. Frederick A. Wolf 69 



Determination of Stearic Acid in Butter Fat. E. B. Holland, 



J. C. Reed, and J. P. Buckley, Jr loi 



Life History and Habits of Two New Nematodes Parasitic on 



Insects. J. H. Merrill and A. L. Ford 115 



Insect Injury to Cotton Seedlings. B. R. Coad and R. W. HowE. 129 

 A Sex-Limited Color in Ayrshire Cattle. Edward N. Went- 



woRTH 141 



Watermelon Stem-End Rot. F. C. Meier 149 



Effect of Pasteurization on Mold Spores. Charles Thom and 



S. PIenry Ayers 153 



Effect of Water in the Ration on the Composition of Milk. W. F. 



Turner, W. H. Shaw, R. P. Norton, and P. A. Wright 167 



Crowngall Studies, Showing Changes in Plant Structures Due to a 



Changed Stimulus. Erwin F. Smith 179 



Effect of Certain Species of Fusarium on the Composition of the 



Potato Tuber. Lon A. Hawkins 183 



Hyperaspis binotata, a Predatory Enemy of the Terrapin Scale. 



F. L. Sim ANTON 1 97 



Test of Three Large-Sized Reinforced-Concrete Slabs under Con- 

 centrated Loading. A. T. Goldbeck and E. B. Smith 205 



Occurrence of Sterile Spikelets in Wheat. A. E. Grantham and 



Frazier Groff 235 



Effect of Cold-Storage Temperatures upon the Pupae of the Medi- 

 terranean Fruit Fly. E. A. Back and C. E. Pemberton 251 



Effect of Climatic Factors on the Hydrocyanic-Acid Content of 



Sorghum. J. J. Willaman and R. M. West 261 



Egg and Manner of Oviposition of Lyctus planicollis. Thomas E. 

 Snyder 273 



Hypoderma deformans, an Undescribed Needle Fungus of Western 



Yellow Pine. James R. Weir 277 



III 



