420 ANNUAL EEPORTS OF DEPARTMENT OF AGRIOULOTtrBE. 



Moths, gipsy and brown-tail — ^^^ 



control work, 1915 211-213 



quarantine 354, 361 



Motion-picture work, Publications Division 268-269 



Mountain beaver, injuries to small fruits and crops 236 



Mules — 



exports, 1914-1915, value, per cent of supply (with horses) 4, 5 



See also Horses. 



Mutton, imports condemned 110 



Naphthalene balls, use for control of insects in stored products 228 



National — 



Forests. See Forests, National. 



park roads, work of year 318-319 



parks, beetle control, demonstration work 225 



Navy butter, packing, keeping qualities, etc 100 



Nebraska, Niobrara game reservation, work of year 243 



Nematodes, plant-infesting, control studies 147 



Net weight, cooperative experiments and studies 195-196 



Nevada, Anaho Island, bird reservation 241 



New England, gipsy-moth control work 211-212 



New Hampshire, gipsy and brown-tail moth, control work 211, 212, 213 



New Jersey, gipsy-moth invasion 212 



New York, gipsy-moth control, progress, 1915 212 



News, market, investigations and experiments 372-374 



Nitrates, surface deposits in United States 208 



Nitric acid, production in Europe 207 



Nitrogen — 



fixation methods, investigations 207 



sources for fertilizer use, investigations 207-208 



North Carolina — 



cotton marketing, investigations 381 



splenetic fever, areas released from quarantine Ill 



Nose fly, investigations 220 



Nxu-sery stock — 



distribution, by States, 1914-1915 356 



importations, inspection and control 355-358, 360 



Nursery trees, insects, investigations. 215 



Nut insects, studies 215 



Oats — 



adulteration, investigations 195 



crop, 1914 3 



exports, 1914-1915, increase 12 



poisoned, use in eradication of prairie dogs 234 



root diseases, studies 147 



Object-lesson, roads construction, 1915, location and type 314 



Observatory buildings, status and number 58-59 



OflBce of Markets and Rural Organization — 



establishment 7 



See also Markets OflBce. 



Ohio, gipsy -moth control, progress, 1915 212 



Oil— 



chenopodium, remedy for worms in hogs 136 



mills, cooperative, studies 384 



plants, utilization investigations 155 



Oil-coralUne road, construction, Florida 315, 324 



Oklahoma, splenetic fever, areas released from quarantine Ill 



Onion, Denia, production from American-grown seed 153 



Onions, insect pests, studies 226 



Oranges, precooUng experiments in Florida 156 



Orchards, insecticides, work 215 



Oregon, bird reservations 242 



Ostrich raising, investigations and work 90-91 



Overflowed land, drainage projects 310 



Oxytropis lamberti, cause of loco poisoning, studies 148 



Oyster industry, cooperative study by Federal and State officials 196-197 



Oysters, destruction by wild ducks 237 



