1136 ANNUAL REPORTS OF DEPARTMENT Of AGRICULTURE. 



Page. 



Plant quarantine law, mppape of act and regulations promulgated 395 



Plant -introduction garclonp, location, growth, and work. 422^24 



Plant-tiuarantinc law, status, ncceesity, etc ()49-G51 



Plants, diiHnisos and nutrition, physiological investigations 301, 412-413 



drug and poiaonous, investigations and problems 391, 408-412 



studies 139-140 



foreign, and seed, introduction 421-424 



Hawaiian, quarantine notice 247 



native, soil indicators, studies 420, 437 



oil and perfumery, studies 140 



poisonous, studies 140, 170, 391, 408-412 



propagation and distribution, department gardens 454 



tropical, growing in plant-introduction gardens 422, 423 



useful for bird f( 'od 666 



Plaster, use on Western soils, note 183 



Pleuropneumonia, control work 163 



Plumage hunting, efforts to control 84 



traffic, investigation and control 677-678 



Poison bait, for destruction of ground squirrels and other rodents 81, 660-663 



Poisoning, horse, by forage, control methods 170 



Poisonous plants, investigations, laboratory studies, etc 391, 411^12 



studies 140, 170 



on forest ranges 523 



Poisons, effect on insects, studies 631 



Polarization, sky, measurement studies 266 



Poles, telegraph, telephone, etc., injury by bark borers, control studies 631-632 



telephone, preservative treatment, experiments 544 



Pomological collections, fruit culture, nomenclature, etc 449-450 



Pomology, field investigations 393, 450-453 



progress 132 



Poplars, dry land , introduction and use, note 120, 123 



Pork production, investigations 323 



trichinae, microscopic inspection 307-308 



Portland laboratory, food and drug inspection work . . 584 



Porto Rico, agriculture board, cooperative study of bird life 665-666 



bird life, cooperative study 665-666 



Experiment Station, development and work, remarks by secretary. 105- 



106, 219-220 



work, 1912 834-836 



forest conditions, study 536-537 



hard fibers, growing experiments 417, 418 



Potash sources, investigations - 10, 73, 612 



Potassium sulphide spray, for control of cotton red spider 79 



Potato beetle, Colorado, control investigations in Virginia 642 



field station, Idaho, establishment 395 



investigations, variety tests, etc 456-457 



wilt, control work 138 



Potatoes crop, 1912, remarks 15 



diseases, cause, control work, etc 136 



growing in Alaska - 831 



improvement by breeding and introduction of new kinds 131 



price, 1912. 20, 21 



quarantine notice 247 



United States, quarantined by Canada 651 



Potato- wart disease, quarantine regulations 651 



Poultry breeding, for egg production, etc., experiments 44 



chemical studies and publications 563 



clubs, girls', organization in Virginia 446 



commercial exhibit and demonstration, Tennessee State Fair 561 



diseases, control studies 170 



industry, 1912, remarks by Secretary 19 



investigations 50-52, 321 



packing and marketing, investigations, Chemistry Bureau. . 560-562, 563, 601 



price, 1912 20 



Prairie dogs, destruction in National Forests, control methods, etc 660-661 



food consumed, etc 660-661 



injury to crops, and control methods 660-661 



