INDEX. 647 



Chemistry — Continued. Page, 



field stations reptjrt for 1920 267 



plant, investigations 273-274 



soils, investigations by Soils Bureau 291-292 



Chenopodium oil, investigations 274 



Cherriei — 



brown rot, control 219 



destruction by robins 357 



Chickens — 



lice and mites, remedies, investigations 612 



mites, control 335 



Chill rooms, eggs and poultry, construction advice 270-271 



China, cotton growing, varieties and production 164-165 



Chinch bugs, control work 311 



Chlorin, disinfectants investigations 146 



Cholera, hog — 



cause and spread 144-145 



investigation-^ and control 30, 90, 94, 135-136, 142-146 



transmission by insects, investigations 335-336 



Citrus- 

 bud selection, and fertilizer experiments 171-172 



canker, eradication 220 



fruits — 



breeding and diseases 181-182, 218 



insect control 337-338 



marketing and distribution 56& 



Climatology, work and stations 80-83 



Clothing, selection and care, studies 489 



C/lover — 



nematode, investigations and control 210 



sweet, seeding tests 190 



Clovers, hop, grazing value 190 



Clubs- 

 boys and girls — 



enrollment and work 470^72, 481-483 



work in Guam, results 463 



poultry, numbers and products 105 



Coast Guard Service, cooperation with Weather Bureau 75, 76, 77 



Coastal Plains Experiment Station, Mississippi, live stock work 93, 95, 96, 99 



Cobs, corn, utilization studies 36, 268, 282 



Codling moth, investigations and control 314-315 



Coffee-bean plant, investigations 142 



Cold storage, investigations and reports (see also Storage) 562 



Collar-blight, apple, control 217 



Colorado, forest-cover studies at Wagon Wheel Gap station 73, 250 



Colors, investigations by Chemistry Bureau 278-279 



Commission men, prosecution for illegal charges 18-19 



Community — 



improvement by home demonstration work 469, 470, 481 



programs of work 476-477 



Compsilura concinnata, parasite of gipsy moth 327 



Concrete — 



investigations in Roads Office 516 



pipes, for irrigation improvement 524 



Condensed milk, investigations, and results 115 



Condenser, camphor, description 193 



Congress- 

 Act- 



Adams, response by States 454 



Container, enforcement 545 



Federal-aid road — 



passage, amendment, and results 48-49 



work of Solicitor 583, 589-590 



Food control, work of Solicitor 603-604 



Grain Standards, amendment and enforcement. 55, 551-553, 580, 581, 584, 602 

 Hatch, response by States 454 



