974 



EXPERIMENT STATION EECOED. 



[Vol.35 



Page. 



Plows — 



development and utilization 391 



engine, adjustment and opera- 

 tion 189 



for tractor use 294, 391 



moldboard, draft of 494 



motor, management 494 



motor, tests 87, 585, 688 



Plum — 



brown rot, notes 351 



silver leaf disease, notes 650 



Plumbing, treatise 690 



Plums — 



breeding experiments 743 



crown gall resistance in 645 



culture in Now York 836 



preservation 367 



winter washes for 38 



Pneumonia — 



chronic catarrhal, In sheep 678 



equine. (See Influenza, equine.) 



Pogonomyrmex tarbata, remedies, 



Ariz 551 



Poliomyelitis — 



occurrence in lower animals 280 



transmission 55, 280 



Pollen — 



formation, studies 523 



grains, germination experiments- 731 

 sterility in relation to crossing- 731 



Pollinopsis t>ctce n.g. and n.sp., de- 

 scription 454 



Polycaon confertiis, notes 58 



Polychrosis — 



hotrana, notes 54, 257 



hotrana, parasites of 253, 659 



viteana. {See Grape berry 

 moth.) 



Polydrusus impressifrons, notes, Conn. 



State 54 



Polyneuritis — 



dietary factors in 166 



treatment 711 



Polyphylla decemlineata, notes. 



Wash 364 



Polyporus — 



ellisianus, notes 655 



igniarius, studies 655 



lignostis, notes 551 



spp. on apples in eastern United 



States 654 



Polysulphid solutions, analyses 678 



Polysulphids, insecticidal value 838 



Polysulphur, determination 207 



Pomelos. (See Grapefruit.) 



Pomological work at Pennsylvania 



Station 644 



Pomology extension work in Massa- 

 chusetts 592 



Poppies, breeding experiments 345 



Poppy seed, weed seeds in 444 



Pork — 



butchering and curing, Cal 569 



frozen, treatment and utiliza- 

 tion 858 



Page. 



Porometer, description and use 431 



Porthetria dispar. (See Gipsy moth.) 



Porto Rico — 



College, notes OS 



Insular Station, notes 400, 597 



Pot experiments — 



factors affiecting yield 215 



moisture control in 319 



Potash — 



deposits in Catalonia, Spain 24 



deposits in Texas 23 



deposits, mineralogy and geol- 

 ogy of 429 



evaporation from brines 219 



extraction from wyomingite 503 



fertilizers, comparison 323 



fertilizers, effect on water re- 

 quirements of plants 630 



for Kentucky soils, Ky 122 



from electrically-treated feld- 

 spar, fertilizing value 726 



from feldspar 326 



from fir wood mill waste 327 



from kelp 327 



German and other sources 24 



in loess soils 809 



in tropical agriculture 126 



loss from soils, Fla 812 



salts, sources and production 23 



supplies of Great Britain dur- 

 ing the war 126 



works waste water for irriga- 

 tion 637 



Potassium — 



chlorid, absorption by plants 435 



chlorid, fertilizing value, Ohio 535 



cyanid, insecticidal value 755 



determination 315 



determination in fertilizers 12 



iodid, therapeutic value 382 



liberation in soils, Ohio 429 



nitrate, absorption by plants 432 



permanganate, effect on moor 



soils 724 



permanganate, effect on plant 



growth 434 



salts, absorption by plants 433 



salts, hygroscopicity 631 



sulphate, fertilizing value, 



W.Va 22 



Potato — 



bacterial rots, studies 349 



beetle, Colorado, in Germany 57 



beetle, Colorado, remedies, Va. 



Truck 661 



black heart, studies 349 



corky scab, notes 650 



diseases in southern Idaho, U.S. 



D.A 751 



diseases, notes 48 



diseases, notes, N.J 455 



diseases, notes. Pa 455 



diseases, studies, N.Dak 48 



diseases, studies, "Wis 544 



diseases, treatment, Minn 652 



