68o 



Journal of Agricultural Research 



Vol. XV 



Sodium — Continued. Page 



cyanid — 



effect on cattleya orchids 267-268 



used to generate hydrocyanic-acid gas . , . 134 

 hydroxid — 



in alfalfa silage 586-590 



used to determine — 



catalase content of seeds 139 



water-soluble nitrogen in spinach . . • . 398-404 



nitrate, effect on plowsole 507 



oxid in normtal and blighted spinach 371-37S 



phosphate, effect on plowsole 507 



sulphate, used in alkali experiment 2S9-319 



Softrot in Ipomoea batatas — 



dissemination 342 



inoculation experiments 342-344 



symptoms 340-342 



Soil Acidity as Affected by Moisture Condi- 

 tions of the Soil (paper) 321-329 



Soil- 

 adobe, inorganic colloids 516 



colloids, relation to plowsole 505-519 



effect of carbon disulphid and toluol on 



nitrogen-fixing organisms 601-614 



Hagerstown silty loam, fertilizer potash 



residues in 59-81 



overwintering of Bacterium lachrymans in. 213 

 particles, effect of size on toxity of alkali. 290-301 

 salt content of, determination by freezing- 

 point method 331-336 



water content of, effect on fumigation with 



hydrocyanic-acid gas 1 133-136 



Soil Factors Affecting the Toxicity of Alkali 



(paper) 287-319 



Snlanum tuberosum — 



effect of farm manure on 494-503 



leafroll 559-57° 



Sorghum kalepensis — 



diameter of cells in seeds 145 



catalase and oxidase content of seeds 137-174 



hybridized with Tunis grass, catalase ac- 

 tivity of seeds 146-147 



Species, new 593-600 



SphacTonem.a fimbriatum, causal organism of 



blackrot of Ipomoea batatas 344 



Spinacia oleracea — 



deuitrification due to blight 401-404 



effect of blight on — 



ash content 371-375 



carbohydrate production 381-384 



nitrogen metabolism 385-404 



oxidase reaction 377-380 



Spinach-blight, physiological studies 369-408 



Sporobolus cryptandrus, source of Puccinia 



graminis in bridging-host experiment ;r8 



Sporoirichium. sp., fungus isolated from Ipc- 



moea batatas 364 



Spruce — 



Engelmann. See Picaa engeltnanni. 

 Norway. S^e Piceaeicelsa. 

 Squash — 



Hubbard. See Cucurbita maxima. 

 Japanese crookneck. See Cucurbita mos- 



chata. 

 summer . See Cucurbita pepo var . condensa . 

 Squirting cucumber. See Momordica elate- 

 rium. 



Page 



Stakman, E. C, Piemeisel, F. J., and Levine, 

 M. N. (paper): Plasticity of Biologic Forms 

 of Puccinia graminis 221-249 



Starch- 

 digestibility 271,282 



influence on digestibility of hay 27a 



in hardened and nonhardened cabbage.. 95-96, 



105-108 



in healthy and blighted spinach 381-384 



methane fermentation 274-275 



net energy value 269-286 



Storage, effect on oxidase activity of seeds. 165-166 



Storage-rots of Ipomoea batatas 337-368 



Straw, effect on alfalfa silage 574-590 



Studies in Inheritance of Certain Characters 

 of Crosses between Dairy and Beef Breeds 

 of Cattle (paper) 1-57 



Stutzer's nitrogen in silage 129-133 



Sucrose in — 



hardened and nonhardened cabbage 95-96 



healthy and blighted spinach 381-384 



Sudan grass. See Andropogon kalepensis su- 

 danensis. 



Sugar beets. See Beta vulgaris. 



Sugar, cane, effect on alfalfa silage 584-590 



Sugars in healthy and blighted spinach. . . . 381-384 



Sulphate — 



calcium, effect on plowsole 507 



copper, effect on Bacterium lachrymans . . . . 205 

 magnesium — 



effect on plowsole 507 



in solution used in experiments with 



greensand 486-492 



sodium, used in alkali experiment 289-319 



Sulphid, copper, used in determining nitrogen 

 in spinach 400-404 



Sulphur trioxid in — 



greensand 485 



normal and blighted spinach 371-375 



Sulphuric acid. See Acid, sulphuric. 



Sunflower. See Helianthus annuus. 



Swanson, C. O., and Tague, E. L. (paper): 

 Chemistry of Sweet-Clover Silage in Com- 

 parison with Alfalfa Silage ii3-i3a 



Sweet clover. See Me/i7o/M.r spp. 



Sweet-clover siiage compared with alfalfa 

 silage 113-132 



Sweet-Potato Storage-Rots (paper) 337-368 



Tague, E. L., and Swanson, C. O. (paper): 

 Chemistry of Sweet-Clover Silage in Com- 

 parison with Alfalfa Silage ii3-i3» 



Tarnished plant bug. See Lygus pratensis. 



Taxus — 

 canadensis, host of damping-off parasites . . 53 1-558 

 cuspidata, host of damping-off parasites. . 531-558 



Temperature — 

 effect on— 



Bacterium, lachrymans 204-205 



catalase activity of seeds 154-156 



relation to hardening of plants against frost 

 injury 93-94 



Terminalia catappa, host of puparia parasi- 

 tized by Diachasma iryoni 429 



Tetramethylparaphenylenediamin, used as a 

 test for oxidase in frozen cabbage leaves. . . 88 



