INDEX. 493 



Page. 



Mouiilaiii re^aoii, agriculturul prol)lem.s 479 



Multigra])h work, Pulilicalions DLvi.sioii, siiiiimary 2!J I 



Muscadine grapes, breeding experiments 110 



National Park, roads im])rovcMnent: 3()7 



Naval stores, work of ( !h(;misl ry 1 >ureau 204-205 



Navy Department, cooperation of Agricullun- i )c|)arl nicnt itiinnius 34-30 



Nebraska — • 



marketing work 449 



Niobrara Reservation, report, 1917 259-200 



Negroes, extension work, South 344 



Nelson, E. W., report as (Ihief of l>ur(>au of Uiologiral Survey, 1917 251-260 



New York, Essex ( ounty, experimental fur farm, work on fur bearers 255 



Nitrogen fixation, studies and experiments. Soils Bureau 223-224 



North Carolina, frost and temperature studies 04 



North Dakota- 

 marketing work 449 



Sullys Hill Game Preserve, report, 1917 200-201 



Northwest, apple storage investigations 158-159 



Nurseries, National Forests, location and stock on hand 170 



Nursery stock — 



importations, by States and by countries of origin 423-425 



inspection, foreign countries maintaining 423 



quarantine 429, 430 



Nuts, insects infesting, studies and control work 231 



Oak brush, poisoning of live stock, investigations Ill 



Oats, seed treatment for prevention of smut, demonstration 347 



Observatory buildings, Weather Bureau, location, etc 52 



Oidiomycosis, cattle, investigations 107 



Oklahoma, marketing work 449 



Oranges, mandarin, exception from quarantine 417, 430 



Orchard management, records, value 474 



Orchards — 



frost warnings, work of Weather Bureau 63-64 



spraying, insecticides and machinery 231-232 



Oregon — 



bird reservations, report, 1917 261 



marketing work 449 



Ostriches, breeding investigations 79 



Ostwald process of ammonia oxidation 22-3 



Ox warble, control, studies 236 



Oysters, investigations by Chemistry Bureau, results 204, 206, 213 



Pacific coast, agricultural problems, studies 479 



Pack, L. W., report as Director of the Office of Public Roads and Rural Engi- 

 neering : 359-380 



Paper making — 



casein supply for, 85 



use of cotton stalks, hemp hurds, and flax straAV, studies 154-156 



utilization of waste barks, etc., various methods 197 



Parasites — 



animal, investigations 117-128 



internal, treatment and control, ex])eriments 120-121, 122-124 



of— 



fruit insects, studies 231 



gi])sy and brown-tail moths, work, 1917 227-229 



Parcel post, marketing, studies , 439-440 



Parexorista chelonix, ])arasite of gipsy moth, establishment 229 



Pastures, irrigated, on reclamation projects 153 



Patents, letters, applications for inventions of employees 383, 384, 406-408 



Peach insects, investigations 230-231 



Pecan rosette, control, studies 136 



Pecans, gro\ving, latitude and other problems 144 



Periodicals, work of Library, and statistics 314-315 



Perishables, conservation, Department work 16-17 



