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CONTENTS 



Page. 



Relative Water Requirement of Plants. Lyman J. Briggs and 



H. L. Shantz I 



Heart-Rot of Oaks and Poplars Caused by Polyporus Dryophilus. 



George G. Hedgcock and W. H. Long 65 



Decomposition of Soil Carbonates. W. H. MacIntirb 79 



A Fungous Disease of Hemp. Vera K. Charles and Anna E. 



Jenkins 81 



A More Accurate Method of Comparing First-Generation Maize 



Hybrids with Their Parents. G. N. Collins 85 



Natural Revegetation of Range Lands Based upon Gro\vth Re- 

 quirements and Life History of the Vegetation. Arthur W. 



Sampson 93 



Pecan Rosette. W. A. Orton and Frederick V. Rand 149 



A Nitrogenous Soil Constituent: Tetracarbonimid. Edmund C. 



Shorey and E. H. Walters 175 



Apple Root Borer. Fred E. Brooks 179 



Changes in Composition of Peel and Pulp of Ripening Bananas. 



H. C. Gore 187 



Assimilation of Colloidal Iron by Rice. P. L. GiLB and J. O. 



Carrero 205 



Coloring Matter of Raw and Cooked Salted Meats. Ralph 



Hoagland 211 



Oil Content of Seeds as Affected by the Nutrition of the Plant. 



W. W. Garner, H. A. Allard, and C. L. Foubert 227 



Studies in the Expansion of Milk and Cream. H. W. BearcE 251 



Life History of the Melon Fly. E. A. Back and C. E. Pemberton . 269 

 Identification of the Seeds of Species of Agropyron. Robert C. 



Dahlberg 275 



Observations on the Life History of Agrilus Bilineatus. Royal 



N. Chapman 283 



Efifect of Dilution upon the Infectivity of the Virus of the Mosaic 



Disease of Tobacco. H. A. Allard 295 



Moldiness in Butter. Charles Thom and R. H. Shaw 301 



Susceptibility of Citrous Fruits to the Attack of the Mediterra- 

 nean Fruit Fly. E. A. Back and C. E. Pemberton 311 



Physiological Changes in Sweet Potatoes during Storage. Hein- 



rich Hasselbring and Lon A. Hawkins 331 



Three-Comered Alfalfa Hopper. V. L. WildermuTh 343 



Life History of the Mediterranean Fruit Fly from the Standpoint 



of Parasite Introduction. E. A. Back and C. E. Pemberton. . 363 



lU 



