JOURNAL OF MOTICRAL RESEARCH 
Vol. XXVI Washington, D. C., October 6-December 29, 1923 
CONTENTS 
Pak'e 
Action of Sodium Nitrite in the Soil. R. H. Robinson .. i 
Effect of Autoclaving upon the Toxicity of Cottonseed Meal. C. T. Dowell 
and Paul Menaul....... ; . 9 
The Auxotaxic Curve as a Means of Classifying Soils and Studying their Col¬ 
loidal Properties. A. E. Vinson and C. N. Catlin (4 text figures).. n 
Some Observations on the Temperature of the Leaves of Crop Plants. Edwin 
C. Miller and A. R. Saunders (8 text figures)...*.. 15 
A New Tumor of the Apricot. Amram Khazanoff (13 plates).. 45 
Notes on the Biology of the Cadelle, Tenebroides mauritanicus Linne. Richard 
T. Cotton...:...... 61 
Chemical Examination of “Chufa,” the Tubers of Cyperus esculentus Linn£. 
Frederick B. Power and Victor K. Chesnut. 69 
The Constituents of “ Chufa” Oil, a Fatty Oil from the Tubers of Cyperus escu¬ 
lentus Linne. Walter F. Baughman and George S. Jamieson__ 77 
Soil Reaction in Relation to Calcium Adsorption. C. O. Swanson (7 text 
figures).............. 83 
Time for Testing Mother Beets. Dean A. Pack. ..... 125 
A Bacterial Stripe Disease of Proso Millet. Charlotte Elliott (4 plates)— 151 
Factors Which Determine Otocephaly in Guinea Pigs. Sewall Wright and 
Orson N, Eaton (3 text figures; 1 plate)....... —.. 161 
A Method of Automatic Control of Low Temperatures Employed by the United 
States Department of Agriculture. John T. Bowen (4 text figures)... 183 
Excretions from Leaves as a Factor in Arsenical Injury to Plants. C. M. 
Smith. ........... 191 
Influence of Soil Temperature and Moisture on Infection of Wheat Seedlings 
by Helminthosporiuin sativum . H. H. McKinney (6 text figures; 4 plates).. 195 
Five Molds and Their Penetration into Wood. Eloise Gerry (4 plates)..... 219 
Common Earthenware Jars a Source of Error in Pot Experiments. J. S. 
McH argue (1 plate)... 231 
The Physiological Effect of Gossypol. Paul Menaul. 233 
Iron Content of the Blood and Spleen in Infectious Equine Anemia. Lewis 
H. Wright. 239 
Further Observations on the Osmotic Pressure of the Juices of the Potato Plant. 
B. F. Lutman........... 243 
A Method for the Quantitative Estimation of Tannin in Plant Tissue. Paul 
Menaul. 257 
A Chemical Analysis of Jatropha stimulosa. Paul Menaul.. 259 
Varietal Resistance in Winter Wheat to the Rosette Disease. R. W. Webb, 
C. E. LEighty, G. H. Dungan, and J. B. Kendrick. 261 
Two Diseases of Udo (Aralia cordata Thunb.). J. L. WeimEr (4 plates). 271 
Biological Notes on the Termites of the Canal Zone and Adjoining Parts of the 
Republic of Panama. Harry Frederic Dietz and Thomas Elliott 
Snyder (8 plates).. 279 
The Absorption of Carbon by the Roots of Plants. J. F. BreazEalE. 303 
Oak Sapling Borer, Goes tesselatus Haldeman. Fred E. Brooks (3 plates).. 313 
Bud Selection as Related to Quantity Production in the Washington Navel 
Orange. A. D. Shamel, C. S. Pomeroy, and R. E. Caryl (2 plates).... 319 
Compounds Developed in Rancid Fats, with Observations on the Mechanism 
of Their Formation. Wilmer C. Powick (2 text figures).. .. 323 
Some Physiological Variations in Strains of Rhizopus nigricans. L. L. Harter 
and J. L. WeimER..... 3 6 3 
Preparation and Properties of Colloidal Arsenate of Lead. F. J. BrinlEy. ... 373 
Active Chlorin as a Germicide for Milk and Milk Products. Harrison Hale y 
and William L. BlEEcker (i text figure; 3 plates).. 375 
71690—25 . (Hi) 
