980 



EXPERIMENT STATION EECORD. 



Plants— Continued. 



climatic relations 719 



collecting, U.S.D. A 327 



composition as affected by sodium salts, 



R.I 419 



denitrification in 325 



desert, root habits 626 



distribution of ions in 323 



experimental rooms for 167 



factors affecting susceptibility to disease. . 844 



flowering, notes 341 



forcing with radium 131 



formation of anthocyan pigments in 421 



nitrogen by 133 



green, respiratory quotient of 27 



herbaceous, culture in Alaska, Alaska. . . 743 



higher, assimilation experiments 732 



imports, U.S.D. A 524 



introduction, Ariz 440 



introductions at Kew botanic garden 441 



irritability in 421 



living, sterilization 40S 



manganese in 2S 



medicinal, improvement 31 



nitrogen nutrition in 628 



of Connecticut Valley, Mass., handbook. . 216 



ornamental, diseases aSecting, Can 242 



of New Mexico, N.Mex 842 



relation to salt spots 422 



soils 212 



resistant to insect attack 653 



respiration in gases 525 



seedling, tin cans v. pots for, Hawaii 236 



structure terminology 665 



symbiosis in 323 



tolerance toward sodium salts 625 



transpiration and water vapor retention 



in 524 



treatise 420 



utilization of ammonium salts by 133 



variations in 321 



water requirements, U.S.D. A 825 



wilting, studies and bibliography 523 



woody, of German East Africa 643 



Kentuckj^ Ky 41 



periodicity in 442 



recovery from hail wounds 131 



Plasmodia, photomicrographs of 47S 



Plasmodiophora brassicas. (See Cabbage club 

 root.) 



Plasmolysis, false, in eel grass 134 



in plant cells 627 



Plasmopara cubensis, notes 243 



viticola, germination of winter 



spores 350 



incubation period 350 



studies 155,249 



treatment 50 



Plaster, land. {See Gypsum.) 



Platyomus Uvidigaster, life history, Hawaii . . . 253 



Pleospora herbarum, notes 245 



Pleuro-pneumonia, contagious, in cattle, 



ultramicroscopic bodies in 587 



{See also Influenza, equine.) 



PlocxdcTUS Tuficornis, notes 457 



Plorabunda oculata, studies, Okla 355 



Plowing, animal v. mechanical power for. . . . 185 



Plowing by steam in Bombay Presidency . . . 692 



effect on soil bacteria 221 



moisture, N. Dak 211 



Plows, construction and operation 292 



motor, tests 86, 185 



use in Uruguay 87 



tests 390 



Plum black knot, notes and treatment 155 



curculio, notes 353 



fire blight, notes, Wash 848 



Plumbago scandens, notes, Ariz 441 



Plxuns, adaptation and variety tests, U.S. 



D.A 41 



composition as affected by irriga- 

 tion, Idaho 236 



cost of production 439 



culture in Alaska, Alaska 743 



new, descriptions, N.Y.State 838 



preservation 312 



reducing and nonreducing sugars in.. 503 



silver leaf disease affecting 845 



varieties, Can 235 



resistant to disease 246 



Plymouth Rocks, barred, color standard 372 



Pneumonia, equine. {See Influenza, equine.) 



Poa spp., germination experiments 143 



Podisus maculiventris, notes, U.S.D. A 455 



Pcecilocoris latus, notes 446 



Pogonomyrmex barbata, notes, Ariz 453 



Point Pleasant area, W.Va. soil survey, 



U.S.D.A 17 



Poisons, effect on seeds 529 



Poles, use in Canada 843 



Poliomyelitis in sheep 681 



relation to stable flies 559, 560 



Pollen, germination 437 



red clover, physiology of 829 



toxin, studies 377 



vitality 41,326 



Pollination, bibliography 437 



Polycaon confertus, notes 657 



Polychrosis botrana, remedies 655 



Polydrosus impressifrons, notes 252 



Poly gala butyracea, rot bacteria affecting 345 



Polyneuritis, experimental, treatment 463 



gallinarum, relation to food- 

 stuffs 865 



studies 180 



treatment 668 



Polyplax spinulosus, distribution on rats 755 



Polpporus berkeleyi, notes 852 



dryopMlus, notes 851 



lignosus, notes 547 



lucidus, notes 446 



vaporarius, notes 157 



Polystictus hirsutus, treatment 552 



Polytrichum commune, eradication, Vt 741 



Pomace fly, biological studies 457 



Pomelos, analyses 362 



changes in, diuing ripening, Fla... 641 



sugar and acid content, Fla 641 



Pomology, teaching 694 



Pond mud, fertilizing value 625 



weed, floating, growing for wild ducks. 373 



Ponds, fertilizer experiments 731 



Ponies, Mountain and Moorland, notes 573 



polo, breeding in England 874 



