980 



EXPERIMENT STATION RECORD. 



[Vol. 43 



Plums — 



blossomnlng period, U.S.D.A., 437. 



breeding oxperiments, 742. 



culture, Nebr., 644. 



hardy varieties, Minn., 833. 



in England, histories, 744. 



orchard survey, Colo., 144. 



pollination experiments, 541. 



spray calendar, N.J., 37. 



thinning experiments, Ohio, 341. 



variety tests, Minn., 833 ; U.S.D.A., 

 144. 



winter injury, U.S.D.A., 435. 

 Pneumococci, H-ion concentration of, 383. 

 Pneumococcus vaccine, preparation, 76. 

 Pneumonia — 



In Iambs, studies, Wyo., 179. 



verminous, in .sheep, 384. 



(See also Pleuropneumonia.) 

 PodoaphwrOi leucotricha, notes, 246, U.S. 



D.A., 549. 

 Poison baits for grasshoppers, 353. 

 Poisonous plants. (<S'ee Forage poisoning, 



Plants, poisonous, and specific plants.) 

 Polistes fMWCEnais, notes, 52. 

 Pollen — 



behavior of, studies, 328. 



development in Cinnamomum, 328. 



nutritive layer of, 525. 



types, phylogenetic significance, 328. 

 Pollination studies, 237. 



(See also specific plants.) 

 Polycotyledony, evolutionary status of, 133. 

 Polyneuritis of pigeons, new term for, 861. 



(See also Vitamin B.) 

 Polyporus — 



pargamenus, biolog^y of, 552. 



sp. on red gum, 243. 

 Polysaccharids, new fungus destroying, 523. 

 Polyzime, starch liquefying power, 503. 

 Pomegranate J\iice, manufacture, Calif., 717. 

 Popillia — 



japonica, life history and control, 558. 



japonica, notes, 362. 

 Poplar — ■ 



bacterial canker, treatment, 552. 



disease, Ariz., 749. 



disease, parasitic, 449. 

 Poppies — 



culture, 638. 



oriental, test of stock, 240. 

 Poppy — 



Iceland, disease, control, 49. 



seed cake as cattle food, 777. 

 Population, relation to agricultural produc- 

 tion, 693. 

 Poria hypolateritia^ (See Fames pseuclo- 



ferreus.) 

 Pork — 



cost and price indexes. Mo., 792. 



cost of production, 773. 



curing, shrinkage as affected by feed, 

 N.C., 465. 



production as affected by pastures, 773. 

 (See al^o Pigs.) 



soft, stuuies, Fla., 775. 

 PorosagroUs orthogonia, notes, Mont., 758. 



Porthetria dispar. (See Gipsy moth.) 

 Porto Rico Federal Station, notes, 100, 600. 

 Potash — 



American sources, 519. 



content of oats as affected by fertil- 

 izers, 322. 



deposits of Eritrea, 428. 



deposits of Spain, 728. 



determination, 115. 



exploration in New Jersey greensands, 

 817. 



fertilizers in England, 26. 



fertilizing value, Tex., 33. 



from feldspar, processes for separa- 

 tion, 519. 



from greonsand as affected by manure- 

 sulphur composts, 517. 



from kelp, 630. 



from wood ashes, 324. 



German v. American, Ind., 325. 



in Texas lakes, 127. 



methods of separation from Chilean 

 nitrate, 25. 



production and use in 1918, 26. 



production in United States during the 

 war, 728. 



resources of Italy, 728. 



soil, factors affecting availability, Md., 

 121. 



Troua, fertilizing value, S.C, 126. 

 Potassium — 



ammonium nitrate, action and use, 125. 



ammonium nitrate, fertilizing value, 

 221. 



carbonate, fertilizing value, 23. 



chlorate as standardizing substance, 12. 



chlorid, effect on composition of soil 

 extracts, Mich., 124. 



chlorid, fertilizing value, Wis., 336. 



content of marsh soils, 22. 



potassium cyanid, use against subsoil 

 nematodes, 47. 



cyanid, use for fumigation of oranges, 

 5-4. 



determination, 112, 803. 



iodid for invert sugar determination, 

 314. 



magnesium sulphate, fertilizing value, 

 126. 



nitrate, preparation, 126. 



nitrate, production in Chile, 25. 



permanganate, use in nitrogen deter- 

 mination, 116. 



salts, control of importation, 26. 



salts, effect on soil structure, 516. 



salts, fertilizing value, 630. 



salts, refined, production in United 

 States, 26. 



soil, as affected by sulfoflcation, 517. 



soil, liberation, 127. 



soil, utilization by intermediary crops, 

 218. 



sulphate, fertilizing value, 126 ; Tex., 

 37; Wis., 336. 



thiocyanate for Invert sugar determi- 

 nation, 814. 



