CONTENTS 
Page 
A New Bacterial Citrus Disease. H. Atherton Lee . i 
Some Facts about Abortion Disease. E. C. Schroeder and W. 
E. Cotton. 9 
Wheat-Sheath Miner. H. E. Seamans. 17 
Relation of the Water-Retaining Capacity of a Soil to Its Hygro¬ 
scopic Coefficient. Frederick J. Alway and Guy R. McDole . 27 
Absorption of Nutrients as Affected by the Number of Roots 
Supplied with the Nutrient. P. E. GilE and J. O. Carrero. . 73 
Flow Through Submerged Rectangular Orifices with Modified 
Contractions. V. M. Cone. 97 
The Venturi Flume. V. M. Cone. 115 
Morphology of Normal Pigs’ Blood. C. C. Palmer. 131 
Fixation of Ammonia in Soils. I. G. McBeth. 141 
Composition of Citrus Leaves at Various Stages of Mottling. 
Charles A. Jensen. 157 
Effects of Muscular Exercise and the Heat of the Sun on the 
Blood and Body Temperature of Normal Pigs. C. C. Palmer. 167 
Relation of the Transformation and Distribution of Soil Nitrogen 
to the Nutrition of Citrus Plants. I. G. McBeth. 183 
Effect of Decomposing Organic Matter on the Solubility of Cer¬ 
tain Inorganic Constituents of the Soil. Charles A. Jensen. 253 
Xylaria Rootrot of Apple. Frederick A. Wole and Richard 
O. Cromwell. 269 
A Comparison of the Hourly Evaporation Rate of Atmometers 
and Free Water Surfaces with the Transpiration Rate of Medi- 
cago sativa. Lyman J. Briggs and H. E. Shantz. 277 
Influence of Crop, Season, and Water on the Bacterial Activities 
of the Soil. J. E. Greaves, Robert Stewart, and C. T. 
Hirst. 293 
The Pink Bollworm, Pectinophora gossypiella. August Busck. 343 
Toxicity of Various Benzene Derivatives to Insects. William 
Moore. 371 
Hybrids of Zea ramosa and Zea tunicata. G. N. Collins. 383 
Eupatorium ageratoides, the Cause of Trembles. R. S. Curtis 
and Frederick A. Wolf. 397 
A Study of Methods of Estimation of Metabolic Nitrogen. E. B. 
Forbes, C. E. Mangels, and L. E. Morgan. 405 
A New Strain of Rhizoctonia solani on the Potato. J. Rosen¬ 
baum and M. Shapovalov. 413 
A Form of Potato Disease Produced by Rhizoctonia. Glen B. 
Ramsey. 421 
Index. 427 
94353°—17 
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