968 



EXPEKIMENT STATION EECOED. 



[Vol. 36 



Page. 



Plasmopara vUicola, notes 347 



Plaster, land. (Se« Gypsum.) 



Plastids, plant, role in cell protoplasm 730 



Plat experiments, calculating yields 827 



Plfctrodera scalator, studies, U.S.D.A 157 



PlectTothrips n.sp., from Jamaica 550 



Pleiospermium n.g. and n.spp., descriptions. . . 433 



Plenodomus fuscomaculans, studies, Mich 746 



Pleosphaeriilina on alfalfa 450 



Pleuro-pneumonia, contagious. (See Influ- 

 enza, equine.) 



PleurolTopis n.sp., description 557 



Plowing— 



experiments 288,389 



fall. Wash 195 



Plows- 

 draft tests 389 



motor, tests 189,588,589 



Plum- 

 diseases, notes 751 



leaf spot, investigations 149 



oil, composition 803 



pockets, treatment 849 



silver leaf, notes 541 



slug caterpillar, notes 654 



tree trunks, introduction of solutions into . 740 



wilt, studies 51 



Plumbing for farm kitchens 390 



Plums — 



breeding experiments 741 



crown gall resistance in 352 



localization of acids and sugars in 110 



pollination, Cal 139 



pollination by bees, Cal 536 



Pneumonia — 



contagious, in horses 85 



equine. (See Influenza, equine.) 



infectious, incattle 675 



lobar, in domestic animals 676 



Poa trivialis, composition and digestibility. . . 469 



Podoscsia syringx, notes 659 



Poison — 



ivy, constituents of 502 



oak, toxicity 501 



Pole holes, digging with dynamite 89 



Poles, industry in 1915, U.S.D.A 844 



Poliomyelitis, transmission by rats and in- 

 sects 354 



Pollen grain as a colloidal system 526 



Pollenia rudis — 



life history 359 



relation to fire blight 351 



Polyarthritis in pigs, notes 280 



Polydrusua — 



impressifrons, notes 456, 859 



spp. , habits 58 



Polyneuritis in pigeons 60 



Pomace wine, composition and detection 205 



Pomacefe of upper South CaroUna 140 



Pomegranates, culture, Cal 743 



Pond lily leaf spot rot, U.S.D.A 752 



Pontia rapx, notes, U.S.D.A 254 



Toplar— 



borer, imported, notes 456 



root weevil, notes 68 



rusts, notes, Conn.State 47 



Poplars for windbreaks, U.S.D.A 143 



Poppy- 

 alkaloids, latex, and oxidases in 127 



culture 743 



diseases, notes 449 



Population, rural and urban, in United 



States 591 



Pork- 

 preservation 509 



trichinaj in 662 



PoTthesia chrysorrhaa, larval disease of 754 



PoTthetria dispar. (See Gipsy moth.) 



Porto Rico — 



College, notes 100 



Federal Station, notes 599, C96, 797 



Station, report 396 



Potash— 



as a blast furnace by-product 625 



as a cement mill by-product 625 



availability in soils, Tex 625 



avaDability in soils as affected by Ume or 



gypsum, U.S.D.A 519 



deposits in Spain and Chile 26 



deposits In Utah 325 



determination in soils 299 



determination in soils, S.C 611 



extraction from alunite, U.S.D.A 17 



extraction from leucite 414 



from banana stalks 820 



in banana stalks and skins, analyses 1 23 



industry in United States 26, 820 



mineral sources 728 



salts. (See Potassium salts.) 



sources, Utah 621 



sources in United States 26, 124 



usein Germany 726 



Potassium— 



chlorid, fertilizing value, Mass 121 



determination Ill, 611, 299 



nitrate, fertilizing value. Wis 626 



salts, eHect on solubiUty of phosphates. . 626 



salts, to.xicity in soils 515 



sulphate, elTect on carnations 4 16 



sulphate, fertilizing value, Mass 121 



sulphate, fertilizing value. Wash 425 



Potato — 



blackleg, notes. Can 250 



blackleg, studies, U.S.D.A 648 



blight, notes 449 



cake, analyses. Can 65 



curly dwarf, studies, N. Y.State .• . . 530 



diseases, dissemination by seed 847 



diseases in Tasmania 846 



diseases, notes 541 



disaeses, notes, Mich 716 



diseases, treatment, Can 47 



diseases, treatment, Conn.State 49 



dry rot, description, U.S.D.A 250 



farms, profits on, N.J 492,893 



Fusarium tuber and stem rot 146 



ladybird beetle, notes 65-4 



late blight, notes 49 



late blight, notes, Can 250 



late blight, notes, Mass 145 



late blight, relation to weather 146 



late blight, studies 749 



