JOURNAL OF AGMC1TI1ML RESEARCH 
Vol. XXX Washington, D. C., January 1-June 15, 1925 
CONTENTS 
rage 
A Study of Variability in the Burt Oat. Franklin A. Coffman, John H. 
Parker, and Karl S. Quisenberry (9 plates; 1 text figure)_ 1 
The Composite Life History of Puccinia podophylli Schw. H. H. Whetzel, 
H. S. Jackson, and E. B. Mains (4 plates)_ 65 
Effect of Height of Chipping on Oleoresin Production. Eloise Gerry (3 
plates; 1 text figure)_ 81 
The Effect of Bacterial Numbers on the Nodulation of Virginia Soy Beans. 
Alfred T. Perkins_ 95 
Classification of Scale Insects of the Subfamily Ortheziinae. Harold 
Morrison (2 plates; 42 text figures)_ 97 
A Test of Raw Onions in the Diet as a Control Measure for Worms in 
Dogs. M. C. Hall, J. E. Shillinger, and E. B. Cram_ 155 
Study of the Life History and Ecological Relations of the Smut of Maize. 
Alden A. Potter and Leo E. Melchers (3 plates; 2 text figures)_ 161 
Further Studies on the Toxicity of Juice Extracted from Succulent Onion 
Scales. J. C. Walker, Carl C. Lindegren, and Freda M. Bach- 
mann (3 text figures)_ 175 
Borax as a Disinfectant for Citrus Fruit. William R. Barger and Lon A. 
Hawkins_._ 189 
The Occurrence of Copper, Manganese, Zinc, Nickel, and Cobalt in Soils, 
Plants, and Animals, and Their Possible Function as Vital Factors. 
J. S. McHargue_ 193 
Anatomy of the Vegetative Organs of Sugar Cane. Ernst Artschwager 
(25 plates; 8 text figures)_ 197 
Regarding the Possible Adaptation of Soy Bean Radicicola to a Specific 
Host Variety. Alfred T. Perkins_ 243 
Sowing and Planting Season for Western Yellow Pine. W. G. WahleN- 
berg (2 text figures)_ 245 
The Quantitative Determination of Xanthophyll by Means of the Spec¬ 
trophotometer and the Colorimeter. F. M. Schertz (5 text figures)_ 253 
Contribution to the Chemistry of Decomposition of Proteins and Amino 
Acids by Various Groups of Microorganisms. Selman A. Waksman 
and S. Lomanitz (1 text figure)_ 263 
A Biometric Comparison of the Urediniospores of Cronartium ribicola and 
Cronartium occidentale. Reginald H. Colley (4 text figures)_ 283 
Root Rot of Peas in the United States Caused by Aphanomyces euteiches 
(n. sp.). Fred Reuel Jones and Charles Drechsler (6 plates; 
1 text figure)_ 293 
Direct Inoculation of Coniferous Stems with Damping-Off Fungi. Annie 
Rathbun-Gravatt (2 text figures)_ 327 
Root Rot of the Grapevine in Missouri Caused by Clitocybe tabescens 
(Scop.) Bres. Arthur S. Rhoads (7 plates)_ 341 
Control of Mycelial Neck Rot of Onion by Artificial Curing. J. C. Walker 
(2 plates)_ 365 
Relative Susceptibility of Selections from a Fulghum-Swedish Select 
Cross to the Smuts of Oats. George M. Reed and T. R. Stanton 
(4 plates)_ 375 
A Comparison of Direct and Indirect Calorimetry in Investigations with 
Cattle. Max Kriss_ 393 
The Life History of Pilacre faginea (Fr.) B. and Br. Q. L. Shear and B. O. 
Dodge (2 plates)_ 407 
Toxicity Studies with Dicyanodiamide on Plants. F. E. Allison, J. J. 
Skinner, and F. R. Reid (2 plates; 3 text figures)_ 419 
Studies on the Single-Injection Method of Vaccination as a Prophylactic 
Against Rabies in Dogs. Harry W. Schoening_ 431 
(in) 
