670 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE. 



rage. 



Screw worms, injuries to animals and control 150, 331-33r) 



Sea foods, utilization studies 209-270 



Secretary, report 3-62 



Seed- 

 adulteration 266 



coni^re-isional, distribution 193 



imp jrtition regulations 631-634 



oil, crops investigations 192 



oils from, composition, studies and publications 268 



potatoes, tosting and storage 176-177 



wheat, treatment for disease, precaution 200, 206, 207. 208 



Seeds — 



interstate commerce regulations 56 



new and rare, distribution 194-195 



Seismology, investigations and registrations 86, 87 



Septic tmlcs, plans 527 



Serums, examination and testing 139-140 



Sewage, irrigation, experiments 527 



Sewerage, systems for fann homes 527 



Shallu, digestion studies 487 



Sheep — 



breeding — 



and feeding experiments and extension work for 99-101 



experiments at Mississippi Coastal Plain Station 93 



grazing, National Forests, permits and nimiber 235 



losses from screw worm injiiries 334 



protection on ranges 345-346 



roundworms, investigations and control 148 



scabies, eradication work 129 



ShelUlsh, injury from trade-waste effluents 270 



Shorts, substitutes, losses to consumers 258-259 



Silage, investigations 117, 156 



Sirups, sources and uses, investigations 267 



Skins — 



imported, certificates 127 



injuiy by alum in curing 280 



Slags, furnace, investigations 517 



Smith- Lever Act, 1914, results 36-37 



Smut — 



leaf, of wheat, resistant varieties and control work 207 



stinking of wheat, seed treatment for control 206 



Smuts, wheat, causes and control 206-208 



Smyrna figs, growing in United States ] 81 



Sneezeweed, western, investigations 141 



Snowfall, mountain, measurements by Weather Bureau 73 



Soaps, nicotine, investigations 11 



Soda nitrate, supply to farmers, work of solicitor 578 



Soils- 

 acidity, determination method 273 



Bureau — 



cooperation with States and with departments 288. 290 



report of chief 285-305 



chemical examination, results 291 



erosion, control, investigations 526 



fertilizer requirements, studies 197 



foreign countries, data, importance 291 



maps, preparation 290 



permanency as agricultural asset 290-291 



physical properties, studies 292-293 



surveys, areas by States, 1920 286-287 



types, plant-food requirements 197 



Solars- 

 heat, use in insect control 323, 334 



radiation, investigations 87-88 



Solicitor — 



library', work in 1920 440 



report, 1920 577-605 



