738 



Journal of Agricultural Research 



Vol. xn 



Nicotiana tabacum — Page 



host plant of Bacterium lahacuin 449-458 



infected seed of, factor in dissemination of 



tobacco wildfire 456 



use as anthelmintic 428-429 



wildfire of 449-462 



Nicotine, toxicity to insect eggs 581 



Nitrates — 



in Wisconsin soils, accumulation of 486-487 



in solution — 



influence of Azotobacter on 200-203 



influence of Bacillus radicicola 011 21 1-2 14 



influence on — 



alfaKa roots 222-226 



Azotobacter 187-208 



Bacillus radicicola 208-226 



fixation of atmospheric nitrogen by 



Bacillus radicicola 2 14-2 1 7 



fixation of nitrogen by Azotobacter 193-201 



formation of volutin bodies in Azoto- 

 bacter 205-208 



infection by Bacillus radicicola 220-222 



nitrogen-assimilating bacteria 1S3-230 



nodule formation 219-220, 222-226 



production of gum by Bacillus radi- 

 cicola 217-219 



production of pigment by Azotobacter. 203-205 

 Nitrification — 

 effect on solubility of tricalcium phosphate 



in soil 675-676 



gelatin, influence of — 

 calcium carbonate in Wisconsin soils on 489-449 



limestone in Wisconsin soils on 489-490 



magnesium carbonate in Wisconsin soils 



on 589-490 



raonocalcium phosphate in Wisconsin 



soils on 489-490 



Nitrobenzene, toxicity to insect eggs 5S1 



Nitrogen — 

 accumulation in Wisconsin soils, influence 



of calcium carbonate on 487-488 



fixation — 



in Wisconsin soils 490-491 



influence of nitrates by Azotobacter on . 193-201 

 influence of nitrates by Bacillus radicicola 



on 214-217 



in soil, effect of crop growth on 311-364 



in soil, effect of season on 311-364 



relation to plant life 183-230 



Nitromethane, toxicity to insect eggs 581 



Nitrotoluene, ortho, toxicity to insect eggs . . 581 



Nitroxylene, toxicity to insect eggs 581 



Nodular worm. See Oesophagostomum. 



Nodule formation, influence of nitrates on. . 222-226 



Noronhia emarginata, food plant of Ceratitis 



capitate 105 



Norton, R. P., et al. (paper): Digestion of 



Starch by the Young Calf 575-578 



Nut, areca. See Areca catechu. 



Oats. See Avena sativa. 



Ochrosia elliplica, food plant of Ceratitis capi- 



tata 105 



Oesophagostomum — 

 columbiantim, in sheep, effect of anthelmin- 

 tics on 404, 410, 412 



dentatum, in hogs, effect of anthelmintics 

 on 4ooff 



Oil— Page 



castor, use as anthelmintic 399 



chenopodium, use as anthelmintic 429-439 



Okra. S^e Abeimoschus esculentus. 



Okra-wilt 529-546 



Oleic acid. See Acid, oleic. 



Oleoresin aspidii, use as anthelmintic 414-416 



Opius humilis — 



cannibalism 286-290 



life cycle 294 



parasite of Ceratitis capitata 104, 286-296 



prolificness 295 



seasonal abundance 291 



Orange. See Citrus. 



Orange production — 



effect of mulch on 513-516 



relation of humus content of soil to 513-516 



Organic compounds — 



boiling point, index to toxicity 580-586 



toxicity to insect eggs 579-587 



volatility, index to toxicity 580-586 



Orobitidae 608-610 



Orobitinae, subfamily of Orobitidae 60S-610 



Ortho-brom toluene, toxicity to insect eggs. 581-582 



Ortho-cresol, toxicity to insect eggs 581 



Ortho-nitrotoluene, toxicity to insect eggs. . . 581 



Palaeopus dioscoreae, n. sp 611 



Palmitic acid. See Acid, palmitic. 



Para-cresol, toxicity to insect eggs 581 



Parasites, fruit-fly 103-108, 285-296 



Peach. See A mygdalus persica. 



Pelletierine tannate, use as anthelmintic. . . 417-418 



Pemberton, C. E., and WiUard, H. F. (pa- 

 per)— 

 Fruit-Fly Parasitism in Hawaii during 



1916 103-108 



Interrelations of Fruit-Fly Parasites in 

 Hawaii 285-296 



Petrolemn — 



benzin, use as anthelmintic 411-413 



ether, toxicity to insect eggs 581, 585-586 



Phenol, use as anthelmintic 413-414 



Phosphate. See Phosphorus. 



Phosphoric acid. See Acid, phosphoric. 



Phosphorus — 



in soil, effect of crop growth on 311-364 



in soil, effect of season on 311-364 



Pierce, W. Dwight (paper): Weevils Which 

 Affect Irish Potato, Sweet Potato, and 

 Yam 601-612 



Pig, toxicity of cottonseed to 89-100 



Pine. See Pinus. 



Pinene, toxicity to insect eggs 581 



Pinus — 



ponderosa, effect of mistletoe on 715-718 



spp., food plant of Porthclria dispar 459-460 



Plow bottom — 



forms of 150-173 



history of development of 173-183 



Plowing, motion of soil particles in 162-173 



Plmn, Brazilian. See Eugenia braziliensis. 



Plummer, J. K. (paper): Studies in Soil 

 Reaction as Indicated by the Hydrogen 

 Electrode 19-31 



Plymouth Rock, Barred, egg production 

 in winter 562-570 



Poisoning, cottonseed 83-102 



Polyporus spp., cultural characters of. . 45-47, 60-61 



