1919] 



INDEX OF SUBJECTS. 



977 



Poanuts — Continued. 



seed weight and abortiveness, N..T., 88. 

 selection experiments, 636. 

 variety tests, Tex., 35. 

 Tear — 



blight, breeding for resistance, S.Dak., 



238. 

 blight, disink-etants for, 452, 65.S. 

 blight, dissemination, 111., 147. 

 blossom bacillus, studies, 841. 

 diseases and pests in Northwetst, con- 

 trol, U.S.D.A.. 836. 

 powdery mildew, notes, 657. 

 psylla, studies, N.J., 58. 

 rust in Oregon, 152. 

 tree borer, sinuate, in New Jersey, 549. 

 Pears — 



Bartlett, pollination, Cal., 240. 

 breeding experiments, S.Dak., 238. 

 drying, 557. 

 Pea.s — 



aerial fertilization with carbon dioxid, 



Vt., 833. 

 and oats as spi'ing forage, Mo., 6."7. 

 and oats for silage. Mo., 334. 

 and oats, yield, N.J., 35. 

 and pea products, analyses. Can., 565. 

 as affected by sodium arsenite, 625. 

 culture in West Indies, 528, 825. 

 fertilizer exptn-iments, N.Dak., 823. 

 field— 



and Sudan grass, comparative 



yields, Nev., 227. 

 as affected by alkali salts, 623. 

 as affected by iron compounds, 



430. 

 culture experiments, 333 ; Alaska, 



31 ; Can., 528 ; N.Dak., 824. 

 culture in Idaho, Idaho, 37. 

 hogglng-off, U.S.D.A., 72. 

 in rotation with wheat, Idaho, 38, 



226. 

 inoculation, Alaska, 30; Idaho, 



38. 

 seed production maps, U.S.D.A., 



236. 

 variety tests, Alaska, 30, 31 ; 

 Ariz., 331 ; Idaho, 38, 225, 226. 

 frost injury, 335. 



garden, strain for Alaska, Alaska, 31. 

 in silage crop mixtures, 676, 732. 

 inoculation tests, 523. 

 nematode injurj% 51. 

 pods and seeds in relation to section 



of plant. N..I., 43. 

 rotation experiments, N.Dak., 139, 



823; R.I., 434. 

 toxic point of alkali salts for, 320. 

 variety tests, 237, 825. 

 zinc content, 464. 

 Peat — 



absorptive power for liquid manure 



and ammonia, 722. 

 and peat-forming plants, Il-ion con- 

 centration, 19. 

 deposits of Minnesota, 517. 



Peat — Continued. 



fertilizers from, 722. 



industry in America, 131. 



soils, management, 624. 



soils of Ohio. Ohio, 212. 



treated, fertilizing value. Can., 516. 



treatises, 518, 814. 



(See aIf:o Moor soils.) 

 Pecans, varieties, 837. 

 Pectinophora and Platyedra, synonymy, 



258. 

 Pectinophora poxsypiella. (t<ee Cotton 



bollworm, pink. ) 

 Pediculus. (See Lice.) 



Pegomyla fusiceps on Lima beans, N..T., 58. 

 Pelenomus sulcicoliis, notes, 758. 

 Pellagra — 



relation to excess of acid, 364. 



studies, 469, 470, 562, 765. 

 Penicillium- — • 



glaucum, gold absorption by, 329. 



f/laucum, practical cultivation, 80. 



sp. on pin(>apple, 4.^0. 



spp., distinguishing between, 842. 

 Ptnnisctum spp. as forage crops, Fla., 37, 



528. 

 Pennsylvania — 



College and Station, xiotes, 4!»9, 700, 

 900. 



Institute of Animal Nutrition, notes, 

 600. 

 Pcntatoma sayi, studies. U.S.D.A., 355. 

 Pentatomoidea of Illinois, 456. 

 Peony pollen, preservation, 343. 

 Pepper — 



anthracnose, studies, 543. 



beetle attacking, N.Mex., 159. 



diseases, notes, 745. 



improvement in India, 522. 



leaf spot, notes, Fla., 543. 

 Perchlorates, estimation, 411, 803. 

 Percgrinus maidis, resistant com varieties, 



Hawaii, 137. 

 Pergandea, new genus, erection, 259. 

 Pnidermium pimi, life history, 752. 



(See aJfso Cronartium and White pine 

 blister rust.) 



Perilla, culture experiments, Ariz., 331. 

 Permeability — 



conductivity as measure, 631, 819. 



relation to availability of plant food, 

 Del., 132. 



relation to geotropic response, 725. 



studies, 329, 525, 631, 819. 

 Pcrmutit for softening water, N.Dak., 89. 

 Peromyscus, variations in, 175. 

 Peroxid associated witli oxidizing systems 

 in plants, 203. 



Peroxidase activities of plants, Del., 132. 

 Peroxidases — 



of fresh and dried vegetables, 202. 



of milk, 616. 



PestaJozzia palmarum, notes, 758. 

 Petroleum, genesis of, 711. 

 Petunias, Phytophthora disease, 656. 



