INDEX. 651 



Disinfectants— i'aKe. 



investigations 146 



manufacture and use, increase G07-609 



District of ('oluml)ia — 



cattle testing for tuberculosis 134 



plants and plant products, act for control of movement 630 



Ditches, irrigation, destruction by rodents 350 



Dog flea, remedies, investigations 612 



Dogs, imported, examination for worm infestation 152 



Dourine — 



diagnosis, use of complement-fixation test 138 



eradication work 129 



Drainage — 



farm inve-tigations, 1920 525-527 



study, and publications on 525-526 



Dried products, insects injurious, control studies 277 



Drought-stricken areas, saving live stock, work of Department 95 



Drug- 

 law enforcement 256, 257-265 



plants, production and utilization 191-192 



Drugs — 



crude, inspection for substitute 266 



imported, inspection for adulteration 265-267 



laboratory studies 274-275 



seizures on account of law violations 257, 264-265 



Drying, fruits and vegetables, investigations 277-278, 486 



Dry-land agriculture, experiments 186-187 



Ducks, wild, feeding grounds, improvement 360 



Duplicating Section, work of Publications Division 403-404 



Durum wheats, introduction, yields and value 32, 168 



Dust- 

 explosions and fires, control work, investigations 280-281, 554 



insecticides, experiments 315, 316, 330, 333 



preventives, researches 518 



Dusting — 



cotton plants, apparatus, public patents 528 



machinery, for insect control, on cotton and tobacco 331, 333 



Dyes, investigations by Chemistry Bureau 278 



Easter lilie.-, growing in District of Columbia and in Virginia 20-21 



Echinacea, therapy, experimental study 140 



Economics — 



home, studies 485-489 



land, investigations 571-572 



Editorial work — 



Pul)lications Division 396-398 



.States Relations Service 448-450 



Education — 



agricultural, in schools, investigations 450-452 



Bureau, cooperation of States Relations Service 452 



veterinary, requirements 152-153 



vocational, importance of home economics work 38 



Eelworm, disease of wheat 201 



Effluents, trade- waste, injury to shellfish 270 



Egg- 

 substitute — 



misbranding, cf)urt decision 595 



whey by-product 115 



substitutes, examination 261, 263 



Eggs- 

 cooking, studies 487 



frozen, examination 270 



investigations by Chemistry Bureau ». . . 270-271 



packing and loading 271 



preserving, experiments 104 



