620 
Journal of Agricultural Research 
Vol. XXV 
Page 
Rhizokiutn leguminosarum , effect on reaction 
of culture medium. 332 
Rhopalosiphum persicae , agency in dissemina¬ 
tion of spinach blight. 11-56 
Ribes spp.— 
injury by Cronartium occidental# . 422-423 
inoculation with Cronartium occidentals .. 419-420 
Rice, wild. See Zizania palustris. 
Roberts, E. (paper): Correlation between the 
Percentage of Eat in Cow’s Milk and the 
Yield. 67-96 
Roripa sp., food plant of Pemphigus populi- 
transversus . 585 
Rose-apple. See Eugenia jarnhos. 
Ruppia rostellafa , host of Tetramyxa para¬ 
sitica . 569 
Rust- 
blister, pifion. See Blister-rust, pinon. 
stem. See Puccinia graminis tritici. See 
also Puccinia graminis tritici-compacti. 
Rutaceous plants. See Plant, rutaceous. 
Rye. See Secale cereale. 
Salix spp., susceptibility to desiccation. 526 
Sanninoidea opalescens, female, at light traps 146-148 
Sapodilla. See Achras sapota. 
Sapote, white. See Casimiroa edulis. 
Satin-leaf. See Chrysophyllum olivaeforme. 
Satsuma orange. See Citrus nobilis var. unshiu. 
Sawdust, use as bedding material. 187-190 
Schoening, H. W., and Reynolds, F. H. 
(paper): An Improved Method for Recover¬ 
ing Trypansomes from the Blood of Rats 
for Antigen Purposes in Connection with 
Complement Fixation. 573-576 
Sderotinia sp., casual organism of stem lesions 
of Sdanum tuberosum . 213-220 
Secale cereale , whitespot disease of. 598 
Seed, resistance to desiccation. 525-532 
Severinia buxifolia, resistance to Citrus-canker 341 
Shapovalov, M., and Edson H. A. (paper): 
Potato-Stem Lesions. 213-220 
Shavings, use as bedding material. 187-190 
Sheep, susceptibility to coccidioidal granu¬ 
loma. 536,538-539 
Shive, J. W., and Martin W. H. (paper): A 
Comparative Study of Salt Requirements 
for Young and for Mature Buckwheat 
Plants in Solution Cultures. 151-175 
Silage, acidity. 395“4°9 
Silver maple. See A cer saccharinum. 
Smith, L. B., and McClintock, J. A. (paper): 
True Nature of Spinach-Blight and Rela¬ 
tion of Insects to Its Transmission. 1-60 
Sodium hydroxid, influence on nitrogen- 
assimilating bacteria. 323-332 
Soil- 
acidity, influence on growth of legume 
bacteria. 319 
alkalinity, influence on growth of legume 
bacteria.. 319 
availability of potash in... 297-316 
deep tilling, effect in Great Plains. 505-517 
dynamiting, effect in Great Plains. 505-517 
effect of gypsum on solubility of potash in, 65 
loess, moisture content of— 
relation to hygroscopic coefficient.453-480 
relation of weather to. 454-457 
Page 
Soil—Continued 
reaction of— 
influence on legumes. 
relation to growth of Azotobacter. 265-271 
subsoiling, effect in Great Plains. 481-521 
Soil Reaction and the Growth of Azotobacter 
(paper)... 265-271 
Sdanum tuberosum — 
anatomy. 221-236 
gross morphology. 223-225 
ontogeny. 237-250 
secondary growth...;.. 249-250 
stem lesions of. 213-220 
Sorghum halepense t syn. Holcus halepensis. 
Sorghum. See Andropogon sorghum. 
Sorodiscus callitrichis t tissue invasion by. 569 
Sorospkaera veronica , tissue invasion by. 568 
South, Toxoptera graminum in. 97-110 
Soybean meal, toxicity. 428-448 
Species, new. 209-211,413-415 
Spinacea oleracea, blight of— 
cause of dissemination. 6 
control. 55-56 
description. 2-4 
history. 4-5 
insect transmission. 10-53 
relation of bacteria to. 7-8 
relation of drainage to. 6-7 
relation of fertilizer to. 7 
relation of fungi to. 7-8 
seed transmission. 55 
soil transmission. 53-54 
summering of. 46-50 
Spinach. See Spinacia oleracea . 
Spinach-blight. See Spinacea oleracea , blight 
of. 
Stahl, C. F., and Carsner, E. (paper): Ob¬ 
taining Beet Leafhoppers Non virulent as 
to Curly-Top. 393-394 
Stakman, E. C., Parker, J. H., and Piemei- 
sel, F. J. (paper): Can Biologic Forms of 
Stemrust on Wheat Change Rapidly 
Enough to Interfere with Breeding for 
Rust Resistance?. m-124 
Stem Lesions Caused by Excessive Heat 
(paper).... 595-604 
Stem lesions of Sdanum tuberosum — 
causal organisms of. 213-219 
inoculations with fungi from. 214-219 
isolation of fungi from. 213-214 
Stemrust. See Puccinia graminis tritici. See 
also Puccinia graminis tritici-compacti. 
Straw- 
barley, use as bedding material.. 187-190 
oat, used as bedding material. 187-190 
wheat, use as bedding material. 187-190 
Strawberry guava. See Psidium cattleianum. 
Subsoiling, Deep Tilling, and Soil Dynamit¬ 
ing in the Great Plains (paper).481-521 
Subsoiling, effect on crops in Great Plains. 481-521 
Sudan-grass hay- 
composition. 176-185 
digestibility. 176-185 
yield. 176 
See also Holcus halepensis sudanensis. 
Sugar beet. See Beta vulgaris. 
Sulphuric acid. See Acid, sulphuric. 
