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CONTENTS 



Page 



A Teosinte-Maize Hybrid. G. N. Collins and J. H. KbmpTon. . . i 



Banana Root-Borer. G. F. Moznette 39 



Effect of Calcium Sulphate on the Solubility of Soils. M. M. 



McCooL and C. E. Millar 47 



Further Studies on the Influence of Humidity upon the Strength 



and Elasticity of Wool Fiber. J. I. Hardy 55 



Composition and Density of the Native Vegetation in the Vicinity 



of the Northern Great Plains Field Station. J. T. Sarvis 63 



Effect of Reaction of Solution on Germination of Seed and on 



Growth of Seedlings. Robert M. Salter and T. C. McIl- 



VAINE 73 



Philippine Downy Mildew of Maize. William H. Weston, Jr . . 97 

 Effect of Drugs on Milk and Fat Production. Frank A. Hays 



and Merton G. Thomas 123 



Artificial and Insect Transmission of Sugar-Cane Mosaic. E. W. 



BrandES 131 



Halo-Blight of Oats. Charlotte Elliott 139 



Influence of Fermentation on the Starch Content of Experimental 



Silage. Arthur W. Dox and Lester Yoder 173 



Effect of Premature Freezing on Composition of Wheat. M. J. 



Blish 181 



Behavior of the Citrus-Canker Organism in Soil. H. Atherton 



Lee 189 



Decline of Pseudomonas citri in the Soil. H. R. Fulton 207 



Variation of Individual Pigs in Economy of Gain. R. C. Ashby 



and A. W. Malcomson 225 



Production of Conidia in Gibberella saubinetii. James G. Dick- 

 son and Helen Johann 235 



Effect of Manure-Sulphur Composts upon the Availability of the 



Potassium of Greensand. A. G. McCall and A. M. Smith .... 239 

 Rust in Seed Wheat and Its Relation to Seedling Infection. 



Charles W. Hungerford 257 



Practical Universality of Field Heterogeneity as a Factor Influ- 

 encing Plot Yields. J. Arthur Harris 279 



Transmission of the Mosaic Disease of Irish Potatoes. E. S. 



Schultz and Donald Folsom 315 



Relative Susceptibility to Citrus-Canker of Different Species and 



Hybrids of the Genus Citrus, Including the Wild Relatives. 



George L. Peltier and William J. Frederich 339 



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