'664 ANNUAL, REPORTS OF DEPARTMENT OF AGRICULTURE. 



Motor— Pa**- 



transportation, progress 41 



vehicles, nuraher, increase, etc 41 



Mountains, snowfall measurements by Weather Bureau 73 



Mules, raising, cost in South 157 



Multigraph work. Crop Rstimates Bureau 40() 



Muscle Snoal8, nitrogen fixation plant, discussion and needs 40, 294, 300 



Xapier grass, pasture value 191, 194 



.\avel orange, introduction and value 32 



Xavy. aviation work, aid by Weather Bureau forecasts and warnings 66-G7, 68, 80 



Nebraska, Niobrara Reservation for game and birds, conditions 366, 369 



Necrotic enteritis, hog disease, similarity to cholera 145 



Negroes, benefits from extension work in the South 471, 473 



Nelson. E. W., report as chief of Bureau of Biological Survey 313-378 



Nemas, importation from foreign countries 216 



Nematode disease of wheat 201 



Nematodes, investigations 210, 205-207 



New — 



England, gipsy and brown-tail moth control work 20-22 



Jersey, gipsy-moth occurrence 328-329 



York, gipsy-moth occurrence 329 



News, market, service on various commodities 538, 541, 542-544, 555 



Nicotine, soaps and papers, investigations 611 



Nitrate of soda, supply to farmers, work of Solicitor 578 



Nitrocellulose, pulp for, determination by Forest Laboratory 249 



Nitrogen — 



fixation, studies and work 40, 292, 294-296 



sources, studies of chemical changes 197 



supply development importance 40 



Norfolk- Hatteras telegraph station, service 76 



North Dakota — 



grasshoppers, outbreak and control 309-310 



Sullys ffill Game Preserve, conditions, 1920 368-3G9 



Northhead-Portland, telegraph station, service 78 



Nursery stock, importations, regulations 631-634 



Nutrition, proteins, chemistry and food value 269 



Nuts- 

 insects, investigations 316-317 



production investigations 172-173 



Oats- 

 acreage and production, 1914-1920, and exports 5, 6, 9 



breeding experiments, and diseases 169, 199 



crop, 1920, remarks by Secretary 3 



Observers, weather, cooperative work and stations 81 



Ocean meteorology. Weather Bureau work 83 



Offshoots, date, importation from Egvpt 180 



Oil— 



com, injury by mold 192 



soy bean, substitute for linseed oil 146 



wintergreen, adulteration, court decision 262 



•Oils- 

 birch and ^vinterg^een, adulteration, court decision 262 



hydrogenated, use in manufacture of tin plate 282 



investigations 268 



kelp, uses and value 304 



misbranding, court decisions 593 



Oil-seed crops investigations 192 



Oklahoma, cotton growing 162 



Olives, inspection for poison, and improved packing 260-274 



Onions, diseases, causes and control 209 



Orange — 



vinegar, manufacture 273 



Washington navel, introduction and value 32 



Oranges, Satsuma, growing in Alabama 175, 176 



Orchard spraying, development 219 



