422 ANNUAL REPOBTS OF DEPARTMENT OF AGRICULTURE. 



Plant — Continued . 



diseases — ^ _ P*89- 



and insects, introduction in importations 358 



investigations 145-147 



Industry Bureau — 



cooperation with Forest Service 184 



cooperative work for Insecticide Board 349 



organization 143-144 



report of chief 143-158 



inspection, work of Horticultural Board 351-353 



quarantine act, enforcement 342-343 



quarantines, foreign and domestic 353-355 



Plant-breeding investigations 148-150 



Plants — 



covered by quarantines, list 359-361 



imported — 



countries of origin, 1915 357 



infestation with insects or diseases 358 



new crop, extension studies 152-154 



oil content, investigations 155 



poisonous — 



injury to live stock on ranges, control studies 148 



studies of 184 



Poison bait — 



for Argentine ant 218 



grasshopper control, cost per acre 222 



use in prairie-dog eradication 234-235 



Poisonous plant investigations — 



on stock ranges 148 



transfer 184 



Pollen, grapefruit, exportation from Florida to Japan 149 



Pork- 

 imports condemned 110 



production, investigations 85-86 



treatment for trichinosis 134 



Porto Rico Experiment Station, work and expenditures, 1915 301, 304-305 



Post roads, construction and maintenance, and economic studies 315, 317, 320 



Potash— 



from kelp, report, special appropriation for printing 255 



sources, investigations 205-207 



supply- 

 danger of exhaustion, possible sources, etc 24-26 



effect of European war, remarks 24-25 



Potassium — 



salts, sources, investigations 205-207 



sulphate production from alunite, discussion 206 



Potato, quarantines and infections 353, 354, 358, 359 



Potatoes — 



crop, 1914 3 



drying methods 192 



insect pests, investigations 225 



seed, improvement studies 157 



uses: 192 



Poultry — 



breeding — 



community, work i 90 



experiments 89 



clubs, work in South, note 10, 89-90 



diseases, investigations, work 121-122 



feeding 193 



investigations 88-91 



loss from diseases, annual 10 



Prairie dogs — 



control work 234-235 



distribution, maps 240 



Press notices, number issued, 1915 264 



Prickly pear, breeding experiments in Texas •« 150 



