io 5 8 



Journal of Agricultural Research 



Vol.VI 



Soil— Continued. Page 

 conditions, mottle-leaf of Citrus trees in re- 

 lation to 721-740 



constituent, a, a-crotonic acid 1043-1046 



method of — 

 analysis of, in manure experiments. . . . 895-896 



sampling, in manure experiments 895 



nitrogen-fixing organisms of, stimulating 



influence of arsenic upon 3S9-416 



organisms — 

 and plant growth, relation of carbon bisul- 



phid to 1-20 



effect of carbon bisulphid on — 



activity of 4-5 



number of 2-4 



production of nitric nitrogen 908-910,916-917 



reinoculated, effect of carbon bisulphid on 



plant growth in 16-17 



sodium salts in, effect of, on plant growth . 857-869 



soluble nonprotein nitrogen of 61-64 



subjected to different systems of cropping 



for 25 years, bacteriological studies of a . 953-975 

 various, effect of carbon bisulphid on plant 



growth in 10-n 



Soja max — 



impermeable seeds in 762 



influence of calcium and magnesium on the 



growth of 605-615 



Solatium tuberosum — 



analyses of 185-186, 191-195 



disinfection of, before storing 827-831 



control of dryrot of 817-832 



effect of — 



planting infected seed of 307-308 



Spondylocladium atrovirens upon 345-346 



experiments with clean seed of, on new land 



in southern Idaho 573 - 575 



field inoculations of, with Fusarium radici- 



cola 302-304 



host plant of — 



Fusarium radicicola 297-310 



Fusarium spp % 183-196 



Pylhium debaryanum 629-636 



Rhizopus nigricans 628-629 



Spondylocladium atrovirens 339-35° 



infection of tubers of, from soil 635-636 



inoculations of, with Fusarium radicicola 300-302 



"leak" of 627-640 



silver-scurf of, caused by Spondylocladium 



atrovirens 339-35° 



storage experiment with 306-307 



a western fieldrot of tubers of 297-310 



Soluble Nonprotein Nitrogen of Soil (paper) . . 61-64 

 Some Properties of the Virus of the Mosaic 



Disease of Tobacco (paper) 649-674 



Sorghum — 

 comparison of the root systems and leaf 



areas of, with corn 3"~33 2 



effect of climatic factors on the hydrocyanic- 

 acid content of 261-272 



water requirement of 473-484 



See Andropogon sorghum and Sorghum vul- 

 gare. 

 Sorghum vulgare — 



hydrocyanic-acid content of 263-264 



conditions of growth of 264-268 



Sorghum vulgare — Continued. Page 



effect of — 

 moisture on hydrocyanic-acid content 



of 268-269 



rate of growth on hydrocyanic-acid con- 

 tent of 270 



temperature on the hydrocyanic-acid con- 

 tent of 269 



varietal differences on hydrocyanic-acid 



content of 270 



variation in glucosid content of 271 



Soybean. See Glycine hispida and Soja max. 



Species, new. 86,277-278,358-360,459,466 



Spikelets, sterile, occurrence of, in wheat. . 235-250 

 Spondylocladium atrovirens — 

 cause of silver-scurf oiSolanum tuberosum . 339-350 



control of 348-349 



effect of upon Solanum tuberosum 345-346 



histology of 344-345 



methods of dissemination of 346-347 



morphology of 339-341 



parasite of Solanum tuberosum 339 - 35° 



reaction of — 



to light 341 



to media 343~344 



to moisture 341-342 



to temperature 342-343 



Squash bug. See Anasa tritis. 

 Stakman, E. C, and Piemeisel, F.J. (paper) 

 Infection of Timothy by Puccinia gram- 



inis 813-816 



Stearic acid — 

 amount of, in the insoluble acids of — 



butter fat 1 10-1 n 



various oils 109-112 



crystallization of, from various solutions. . . 106 



determination of, in butter fat 101-113 



influence of different fatty acids on precipi- 

 tation of 107-112 



solubility of 103 



Stevens, Neil E, (paper) Pathological His- 

 tology of Strawberries Affected by Species 



of Botrytis and Rhizopus 361-366 



Stimulating Influence of Arsenic upon the 

 Nitrogen-Fixing Organisms of the Soil 



(paper).- 389-416 



Storage, experiments with Solanum tubero- 

 sum 306-307 



Storage-Rot of Economic Aroids (paper) .... S49-572 

 Strawberry. See Fragaria spp. 



Streptococcus lactis, life cycle of 688-694 



Studies of the Physiology of Reproduction in 

 the Domestic Fowl. XV.— Dwarf Eggs 



(paper) 977-1042 



Sulphate, effect of carbon bisulphid on accu- 

 mulation of, in soil 17 



Sweet potato. See Ipomoea batatas. 

 Sympiesis — 



dolichogaster, parasite of Omix geminatella. . 295 



meteori, parasite of Omix geminatella 295 



nigrifemora, parasite of Omix geminatella ... 295 



tischerae, parasite of Omix geminatella 295 



Syncephalastrum sp., effect of heat on. . 155, 159, 161 

 Syringa sp., host plant of Dialeurodes citri 469 



