IXDEX. 671 



Page. 



Sorfrhum. grain, crop of 1920, remarks by Secretary 3 



Sorghums — 



grain, acreage and production, 1914-1920 5, 6 



testing and breeding 188 



South America — 



agricultural resourcos, studies and maps 573 



live-stock conditions 534 



South Dakota. Wind Cave National Game Preserve, conditions 367, 368 



Southern States — 



crop acreages increase since 1909 467 



dairy extension 10G-] 11 



live-stock improvement 467. 468 



markets, growth of cooperation 468 



milk, use and improvement campaign 110 



mules, cost of raising 157 



Soy beans — 



introduction, variety tests, and value 32 



oil, substitute for linseed oil 146 



varieties, testing and breeding 189, 195 



Specialists, extension, cooperative work 468, 48.3-484 



Sphinx moths, injury to vineyards, and control 326-329 



Spoilage, food, investigations 272-273 



Spray gun, value in orchard spraying 9 



Sprayer, power, use on tobacco 332 



Spraying — 



alfalfa wee\'il. cost and saving 310-311 



chemical studies 276 



orchard mf'thods, development 219 



combined insecticide and fungicide, investigations 611-612 



Sprays — 



Pickering, experiment* 276 



Spruce, insects, investigations 321 



Sfiuirrels, ground, extermination 348-349 



St. Louis, milk supply, adulteration and control work 259-260 



Standards- 

 cotton, preparation and distribution and demonstrations 549-551 



grain, law enforcement 551-553 



Starch plant, cnvna edulis, grooving in Florida 186 



States Relations Service — 



cooperation in agricultural education 450-452 



librarj' work 440, 442 



oflBce, work of director 448-453 



organization and duties 447-448 



rej)ort of director 445-489 



Statistics — 



collecting and arranging, work of Crop Estimates Bureau 407-421 



dairy, collection 117 



library circulation 429-431 



market, compilation 533-534, 555 



"surplus and deficiency" work 411-412 



work of Crop Estimates Bureau, need 17-18 



Stock feed, sawdust utilization 248 



Stockyards, cattle testing, for tuberculosis 134 



Stone, road-building, investigations 517 



Storage — 



celery, calorimeter studies 487 



cold, investigations and report 562 



fruits — 



and vegetables, protection --_•--, 535, 563-564 



roots, and vegetables, investigations 175-177 



houses for sweet potatoes, plans 527 



Stored products, insects injurious, investigations 311 



Storms, 1919-1920 warnings by Weather Bureau 69 



Strawberry insects, investigations 321 



Strassfurt deposits, similar soils in United States 291 



Stream flow, relation to forest cover, studies 250 



