478 



EXPERIMENT STATION RECORD 



Pyridin— Continued. 



derivatives in soils, (32) 718. 

 detection in vinegar, (26) 209. 

 determination, (26) 709. 

 disappearance in soils, (36) 432, 725. 

 effect on plant growth, (30) 212. 

 effect on soil organisms, (31) 27; (38) 420. 

 in soils, studies, (38) 119, 129. 

 insecticidal action, (26) 758. 

 relation to aroma of coffee, (31) 165. 

 separation from ammonia, (26) 709. 

 sterilization of soils by, (32) 816. 

 vapor larvicidal value, (34) 359. 

 Pyrilla aberrans, studies, (38) 462. 

 Pyrilloxenos compactus n.g. and n.sp., description , 



(32) 851. 

 Pyrites, production and use in 1911, (29) 213. 

 Pyritic cinder, fertilizing value, (29) 129. 

 Pyrocatechin — 



effect on cyanogen formation in plants, (28) 527. 

 presence in plants, (38) 223. 

 utilization by plants, (30) 329. 

 Pyroderces— 

 rileyi— 



description, (37) 564. 

 notes, (27) 657; (36) 56; (40) 453. 

 studies, (35) 256. 

 spp., notes, (27) 862. 

 Pyrogallic acid, effect on action of soil organic 



compounds, (34) 127. 

 Pyrogallol— 

 effect on — 



cyanogen formation in plants, (28) 527. 

 nitrification in soil, (38) 119. 

 plant growth. (36) 212. 

 soils, (28) 123. 

 extraction with ether, (37) 414. 

 relation to soil "sickness," (28) 520. , 

 Pyrol, culture experiments, (31) 829. 

 Pyroligneous acid, production from wood, (28) 50. 

 Pyromucuric acid, cleavage by mold enzyms, (30) 



503. 

 Pyronia, description, (35) 743. 

 Pyronota festiva, notes, (28) 757. 

 Pyrophorus — 



luminosus, notes, (32) 555. 

 of America, revision, (40) 655. 

 Pyrophosphate— 



assimilation by plants, (29) 624. 

 Qiana, fertilizing value, (26) 42. 

 Pyrophosphoric acid- 

 esters of inosit, (27) 712. 



relation to toxicity of cottonseed meal, (29) 76. 

 Pyropolyporus — 



calkinsii, notes, (26) 751. 

 everhartii as a wound parasite, (32) 752. 

 ribis, notes, (32) 441. 

 Pyroracemic acid, decomposition by dead plants, 



(37) 201. 

 Pyrox— 



analyses, (26) 65. 



fungicidal value, (37) 447; (38) 235. 

 insecticidal value, (34) 147. 

 Pyrrhopyge sp., notes, (30) 657. 

 Pyrrhula europaca, feeding habits, (28) 450. 

 Pvrrolic acid, effect on chlorophyll formation, (35) 



435. 

 Pyrus— 



baccata, notes, (28) 436. 



malus, inflorescence and fruit of, (36) 331. 



rivularis as a stock for cultivated apples, (32) 



45. 

 sinensis, studies, (29) 541. 

 spp., host of apple aphis, (28) 251. 

 spp. inoculation experiments with brown rot 

 fungus, (33) 247. 

 Pythiacystis— 



citricola, notes, (29) 243. 

 citrophthora— 



description, (34) 353. 

 growth in cultures, (38) 757. 

 notes, (30) 51, 749. 

 studies, (33) 55, 5.50. 

 treatment, (35) 754. 

 sp. on avocado, (37) 555. 

 sp. on deciduous nursery stock, (34) 353, 646. 

 Pythium — 



debaryanum — 



description, (31) 51, 448. 

 detection in potato tissue, (39) 248. 



Pythium— Continued. 



debaryanum — continued. 



inoculation experiments, (28) 750. 



notes, (26) 548, 747; (27) 45, 544, 728; (28) 



246; (29) 549, 047; (31) 55; (37) 148. 

 on conifer seedlings, (40) 545. 

 relation to potato leak, (35) 751. 

 relation to sugar beet damping off, (33)246 . 

 treatment, (27) 655; (30) 846; (31) 448, 647; 

 (36) 547; (38) 149. 



gracile, notes, (27) 747; (28) 241. 



palmivorum — 



description and treatment, (32) 149. 

 notes, (27) 353, 751; (28) 241; (34) 643; (36) 

 47; (38) 354. 



sp., affecting cotton, (29) 749. 

 Pyxinia n.spp., descriptions, (37) 558. 

 Quack grass- 

 creeping rootstock of, (31) 37. 



description and eradication, (36) 638. 



destroyer, analyses, (30) 697. 



dissemination of fungi by, (28) 442. 



eradication, (27) 31; (28) 235, 834; (30) 738; (31) 

 438; (32) 530; (34) 339; (35) 35; (37) 227; (40) 

 734. 



identification, (29) 741. 

 Quail- 

 California, notes, (27) 355. 



California valley, destruction with poisoned 

 barly, (34) 850. 



California valley, notes, (31) 846. 



coccidiosis in, (26) 187. 



domestication, (33) 381. 



food habits, (39) 860. 



guano, analyses, (28) 523. 



propagation, (28) 752. 



valley, eating of alfalfa weevQ by, (31) 655. 

 Quamasia— 



spp., notes, (35) 730. 



walpolei n.sp., description, (35) 730. 

 Quarantine — 



laws, animal, (32) 679. 



regulations, discussion, (27) 400. 



regulations in Canada, (31) 80. 



service, federal, sanitary police work in, (27) 77, 

 576. 

 Quassia extract, insecticidal value, (38) 55. 

 Quassiin, insecticidal value, (32) 649; (34) 355. 

 Quaternary halids in dye making, (40) 711. 

 Quebec Society for the Protection of Plants from 



Insects and Fungus Diseases, (32) 151. 

 Quebrachia lorentzii, notes, (27) 347. 

 Quebracho — 



red, studies, (36) 745. 



wood, uses and substitutes, (27) 347. 

 Quercetin, determination in wine, (31) 412. 

 Quercus— 



agrifolia, Christmas-berry tingis affecting, (26) 

 148. 



emoryi, notes, (27) 647. 



garryana, notes, (27) 846. 



morehus, common name for, (36) 243. 



n.spp. of lower California, (34) 827. 



nigra, heart rot affecting, (26) 751. 



of eastern North America, (33) 646. 

 Quicklime — 



and calcium arsenate spray, (39) 311. 



effect on carbon dioxid content of soil air, (39) 

 516. 



effect on organic matter in soils, (35) 522. 



effect on soils, (30) 127. 



fertUizing value, (30) 839. 



treatment of wheat, (40) 337. 

 Quince — 



blight, notes, (31) 644; (34) 648. 



blotch, notes, (30) 541. 



blotch, studies, (27) 652; (33) 247. 



borer, notes, (38) 465. 



crown gall, notes, (28) 447. 



curculio, notes, (36) 856. 



diseases, notes, (33) 741; (37) 51; (38) 50. 



diseases, treatment, (33) 349; (34) 50. 



fire blight, description, (33) 447. 



fire blight, notes, (29) 348, 848. 



fruit spot, notes, (29) 547. 



Japanese, destruction, (26) 334. 



Japanese, fruit of, (34) 256. 



Japanese, petalization, (38) 446. 



juice, fermentation, (29) 116. 



leaf blight, investigations, (33) 347. 



