JOURNAL OF AfflflffilAL RESEARCH 
Vol. XXV Washington, D. C., July 7-September 29, 1923 
CONTENTS. 
Work and Parasitism of the Mediterranean Fruit Fly in Hawaii during 1919 and 
1920. H. F. WlLLARD.. • • * * • .. 
Acid Production by Rhizopus tritici in Decaying Sweet Potatoes. H. A. Edson . 
Temperature Effects in Plant Metabolism. W. E. Tottingham (2 text figures; 
4 plates). . .• • ■ ■ • • • • • • • *.-— • * 
Platygaster vernalis Myers, an Important Parasite of the Hessian Fly. 
Charges C. Hill (7 text figures; 4 plates).....; V • M 
Transmission, Variation, and Control of Certain Degeneration Diseases of Irish 
Potatoes. E. S. Schultz and Donald Folsom (15 plates). 
Some Relations of the Crowngall Organism to its Host Tissue. A. J. Riker 
(5 plates)......; * * 
Oxygen-Supplying Power of the Soil as Indicated by Color Changes in Alkaline 
Pyrogallol Solution. LEE M. Hutchins and Burton E. Livingston. 
Bacterial Spot erf Lima Bean. W. B. Tisdale and Maude Miller William¬ 
son (3 plates). •••••• .;. 
Hydrogen-Ion Changes Induced by Species of Rhizopus and by Botrytis ctnerea . 
J. L. Weimer and L. L. Harter... 
Growth-Promoting Value of the Proteins of the Palm Kernel, and the Vitamin 
Content of Palm-Kernel Meal. A. J. Finks and D. Breese Jones (5 text 
figures).. 
Efficiencies of Phosphatic Fertilizers as Affected by Liming and by the Length 
of Time the Phosphates Remained in Porto Rican Soils. P. L. GilE and J. 
q Carrero (i text figure)....... 
Growth of Fruiting Parts in Cotton Plants. R. D. Martin, W. W. Ballard 
and D. M. Simpson (2 plates)... 
Systemic Infections of Rubus with the Orange Rusts. B. O. Dodge (7 text 
figures; 7 plates). ....... ..* • • •.j 
Resistance m Rye to Leaf Rust, Puccinia dispersa Erikss. E. B. Mains and 
q Leighty (2 plates).... ...j................... 
An Undescribed Orange Pest from Honduras. A. C. Baker (2 plates). 
Correlation of Foliage Degeneration Diseases of the Irish Potato with Variations 
of the Tuber and Sprout. Alfred H. Gilbert (6 plates).... 
Comparative Study of Phytophthorafaberi on Coconut and Cacao m the Philip¬ 
pine Islands. Orro A. Reinking (5 text figures; 12 plates). 
Quantitative Variation of Gossypol and its Relation to the Oil Content of Cot¬ 
tonseed. Erich W. Schwartze and Carl L. Alsberg (3 text figures)... 
Inheritance of Dwarfing in Maize. J. H. Kempton (9 text figures; 5 plates).... 
Determination of Sulphur Compounds in Dry Lime-Sulphur. Carleton 
Parker Jones (2 text figures).... 
The Twinning and Monembryonic Development of Platygaster hiemalis t a Para¬ 
site of the Hessian Fly. R. W. Leiby and C. C. Hill (5 plates). 
Pathogenicity of Ophiobolus cariceti in its Relationship to Weakened Plants. 
H. R. Rosen and J. A. Elliott (5 plates).. 
The Pharynx and Alimentary Canal of the Hookworm Larva Necator atnericanus. 
N. A. Cobb (i plate). # . 
Specialized Varieties of Puccinia glumarum and Hosts for variety tritici . 
Charles W. Hungerford and C. E. Owens (6 plates). 
Origin and Control of Apple-Blotch Cankers. Max W. Gardner (3 plates). 
Determination of the Surface Area of Cattle and Swine. Albert G. Hogan 
and Charles I. Skouby (i plate)..... 
Soil Temperature as a Factor Affecting the Pathogenicity of Corticium vagum 
on the Pea and the Bean. B. L. Richards (6 text figures; 2 plates).. 
Growing Experimental Chickens in Confinement. C. A. Herrick, J. E. 
Ackert, and Bertha L. Danheim (2 plates)... 
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