504 
Journal of Agricultural Research 
Vol. XXV 
Potato—Continued. Page 
foliage diseases, relation to variations of the 
tuber and sprout. 255-266 
infection with Corticium vagum .431,437.443 
variations of tuber and sprout, relation to 
foliage diseases. 255-266 
Potatoes— 
disease perpetuation and spread..,...96-102 
disease transmission— 
between varieties of potato.63-85 
to other species. % . 85-910 
Green Mountain, transmission of diseases. 46-63 
mosaic diseases, transmission experiments. 46-53. 
62,63-92 
rest periods before germination, tests. 256 
sprout variations relation to foliage degen¬ 
eration diseases.255-266 
sprouting retardation by foliage disea$es. ( 256-257 
transmission, variation, and control of dis¬ 
eases. 43-«8 
tuber variations, relation to foliage de¬ 
generation diseases. 255-266 
Puccinia — 
dispersa . 243-252 
glumarum — 
specialized varieties, and hosts for var, 
tritici .363-402 
tritici . 371-399 
peckiana , raspberry infection, experiments 499 
Pyrogallol, alkaline solution, indication of 
oxygen-supplying power of soil. 133-140 
, color changes in testing oxygen-supplying 
power of soils..... *33~*40 
Pythium palmborum, same as Phytopkthora 
Palmtvorum . 282-283 
Quantitative Variation of Gossypol and Its 
Relation to the Oil Content of Cottonseed: 
Eridi W. Schwartze and Carl L. Alsberg. 285-296 
Raspberry— 
infection with orange rust, studies. 2x2-219, 
23S-239 
mosaic, inoculation into potatoes, results... 92 
stomata, development and distribution, re¬ 
lation to orange rusts. 495-500 
Reinking, Otto August: Comparative study 
of Phytophthora faberi on Coconut and Cacao 
in the Philippine Islands. 267-284 
Resistence in Rye to Leaf Rust, puccinia 
dispersa Erikss: E. B. Mains and C. E. 
Leighty.... 243-252 
Rhizopus — 
hydrogen-ion changes caused by spp.155-160 
tritici — 
acid production in decaying sweet pota¬ 
toes. 9-12 
activity, relation to light. 157-160 
Richards, B. L.: Soil Temperature as a 
Factor Affecting the. Pathogenicity of 
Corticium vagum on the Pea and the 
Bean...,..431-450 
Riker, A. J.: Some Relations of the Crowngall 
Organism to Its Host Tissue.. 119-132 
Roots, Rubus spp., susceptibility to orange 
rust. 227-229,232-234 
Rosen, H. R. and Elliott, J. A.: Pathogenicity 
o ( Ophiobolus cariceti in Its Relationship 
to Weakened Plants.351-358 
Rubber seedlings, infection with coconut 
budrot. 270 
Rubus— 
infections with orange rusts. 209-242 
orange rusts, effect on development and 
distribution of stomata.495-500 
Rust- 
leaf, resistance to in varieties of rye...... 243-252 
orange— 
distribution and control. 239-240 
infection types on Rubus. 224-234 
specialized races 011 blackberry, dewberry, 
and raspberry. 235-237 
new type on blackberry.491-494 
on Rubus, effect on development and dis¬ 
tribution of stomata...495-500 
raspberry and blackberry infection in 
greenhouses. 215-217,234-235 
Rubus systemic infections. 209-242 
stripe, specialized varieties, discussion... 363-366 
Rye— 
breeding for resistance to leaf rust, results. 245-247 
inoculation with wheat stripe rust, results.. 367 
Rye—Continued. Page 
leaf-rust resistance. 243-252 
varieties, resistance to leaf rust, studies... 248-250 
Sap, density, relation to acidity in stalks and 
leaves of plants. 462-467 
Schultz, E. S., and Folsom, Donald: Trails-, 
mission. Variation, and Control of Certain 
Degeneration Diseases of Irish Potatoes... 43-1x8 
Schwartze, Erich W., and Alsberg, Carl L.: 
Quantitative Variation of Gossypol and Its 
Relation to the Oil Content of Cottonseed. 285-295 
Seed, cotton, examination for gossypol con¬ 
tent.. 287-289 
Simpson, D. M., Martin,-R. D., and Ballard, 
W. W.: Growth of Fruiting Parts of Cot¬ 
ton Plants. 195-208 
Skouby, Charles I., and Hr-gan, Albert G.: 
Determination of the Surface Area of Cattle 
and Swine...4*9"430 
Slag.basic,efficiency in PortoRican soils. 174-183,187 
Soil- 
cultures, buckwheat-growing experiments. 20-24 
effect of climate on, studies... 13-30 
efficiency of phosphatic fertilizers in Porto 
Rico.......... 171-194 
oxygen - supplying power, indication 
method. 133-140 
treatment for control of wheat “take-air* 
disease, experiments. 354 _ 356 
Soil Temperature as a Factor Affecting the 
Pathogenicity of Corticium vagum on the 
Pea and the Bean: B. L. Richards. 43 * 
Some Relations of the Crowngall Organism to 
Its Host Tissue: A. J. Riker.. v 119-13* 
South Carolina, cotton, growth of fruiting 
parts under humid conditions. i 95 » 
196,197.198, 205-206 
Specialized Varieties of Puccinia gluiHa min 
and Hosts for var. tritici: Charles W. Hunger- 
ford and C. E. Owens.363-409 
Spelt, susceptibility to wheat stripe rust in¬ 
fection, experiments.380,387*396 
Spindling sprout, potato, relation to leaf- 
roll. 260-262 
Spindling tuber, potato disease, description 
and transmission. 55-60,61 
Spot, bacterial of Dima bean, cause and de¬ 
scription. 141-154 
Sprays, apple-blotch control on leaf and 
twig. 409 “ 4 ** 
Sprouts, potato, apical dominance, relation to 
foliage condition. 263-265 
Squares, cotton, growth methods in different 
varieties. 198-202 
Stomata, Rubus, development and distribu¬ 
tion, relation to orange rusts. 495-501 
Streak, potato disease, description and trans¬ 
mission experiments. 53-54*6 i 
Stripe rust, wheat, varietal susceptibility 
nursery and greenhouse studies....371-399 
Sulphur compounds in dry lime-sulphur, 
determinations. 3*3-336 
Superphosphates, double, efficiency in Porto 
Rican soils. 172-183,187 
Sweet potatoes— 
decay produced by RhizoPus spp. and 
Botrytis cinerea . 155-164 
decaying, acid production by Rhizopus 
tritici . 9“** 
Systemic Infection of Rubus with the Orange 
Rusts: B. O. Dodge. 209-242 
Take-all wheat disease, relation to weakened 
plants, and control. 35*~358 
Temperature Effects in Plant Metabolism: 
W. R. Tottingham.. 13-30 
Temperature, soil, relation to pathogenicity 
of Corticium vagum. .. 431-450 
Tetrastlchus gijfardianus, parasite of fruit fly, 
in Hawaii... 1,4-7 
Texas cotton, growth of fruiting parts under 
drought conditions. 195,196,197,198, aoi-204 
Thiosulphate, determination, by carbonic- 
acid method. 325-327*330-33* 
Tisdale, W. B.. and Williamson, Maude M.: 
Bacterial Spot of Lima Bean. i4*”*54 
Tobacco, inoculation with potato mosaic-86-89 
Tomato— 
crowngall infection, studies and experi¬ 
ments .. 119-132 
infection with coconut budrot. 270 
