CONTENTS 



Page 



Meat Extracts, Their Composition and Identification. James A. 



Emery and Robert R. Henley i 



Quantity and Composition of Ewes' Milk: Its Relation to the 



Growth of Eambs. Ray E. Neidig and E. J. Iddings 19 



Seed Disinfection by Formaldehyde Vapor. Cecil C. Thomas. . 33 



Influence of Soil Environment on the Rootrot of Tobacco. James 



Johnson and R. E. Hartman 41 



Relation of Sulphates to Plant Growth and Composition. H. G. 



Miller 87 



Relation of Weather to Fruitfulness in the Plum. M. J. Dorsey. 103 

 Structure of the Maize Ear as Indicated in Zea-Euchlaena Hy- 

 brids. G. N. Collins 127 



Carbohydrate Metabolism in Green Sweet Corn during Storage 



at Different Temperatures. Charles O. Appleman and John 



M. Arthur 137 



Certain Relationships between the Flowers and Fruits of the 



Eemon. Howard vS. Reed 153 



Ultra-Microscopic Examination of Disperse Colloids Present in. 



Bituminous Road Materials. E. C. E. Eord 167 



Derris as an Insecticide. N. E. McIndoo, A. F. SeivERS, and 



W. S. Abbott 177 



Effects of Heat on Trichinae. B. H. Ransom and Benjamin 



Schwartz 201 



Effect of Removing the Pulp from Camphor Seed on Germination 



and the Subsequent Growth of the Seedlings. G. A. RussELL. 223 

 Bacterium abortus Infection of Bulls. J. M. Buck, G. T. CreEch, 



and H. H. Ladson 239 



Investigations on the Mosaic Disease of the Irish Potato. E. S. 



Schultz, Donald Folsom, F. Merrill Hildebrandt, and 



LoN A. Hawkins 247 



Temperature in Relation to Quality of Sweetcorn. Neil E. 



Stevens and C. H. Higgins 275 



Variation of Ayrshire Cows in the Quantity and Fat Content of 



Their Milk. Raymond Pearl and John Rice Miner 285 



Index 323 



ERRATA AND AUTHORS' EMENDATIONS 



Page 82, TableIL"Gni." should read "Pounds." 

 Page 158, line 2, "variability" should read "viability." 

 Page 160, line 23, "0.183" should read "—0.183." 



Page 162, Table VII, " Months required for maturity " should stand above the table. The legend at 

 the left of the table should be "Month in which fruit set." 



Page 179, line 30, ''petroleum, ether" should read " petroleum ether." 



(ni) 



