Jan. 6-Mar. 31, 1919 



Index 



355 



Page 



Nitric nitrogen in soil, effect on salts 107-135 



Nitrification of acid soils 27-42 



Nitrogen — 

 amino, in wheat, method for determining. . 7-13 

 in plants grown with barium and strontiiun 



compounds 189,191,193 



in wheat, determination with the hydro- 

 gen electrode 1-13 



^ ratio to organic matter in surface soil 266-269 



Nitrogen-fixing bacteria, effect of salts 107-135 



Nollau, E. H.,etal. (paper): Effect of Certain 

 Rations on the Growth of the White Leg- 

 horn Chick 305-312 



Nonglucoside in Andropogon sorghum 175-181 



Noyes, H. A., and Conner, S. D. (paper): Ni- 

 trates, Nitrification, and Bacterial Contents 

 of Five Typical Acid Soils as Affected by 



Lime, Fertilizer, Crops, and Moisture 27-42 



Oats. See Avena sativa. 



Oil, mustard, effect on germination of Irish 



potatoes 298 



Onion juice, effect on germination of Irish 



potatoes 298 



Optus guebecensis, parasite of Pegomyia 



calyptraia 237-238 



Organic matter — 

 effect on water-holding capacity of silt- 

 loam soil 263-278 



ratio to nitrogen in surface soil 266-269 



Oxid, ferric, in corn grown with barium and 



strontium compounds 192 



Oxygen, effect on apple-scald 203-204 



Oxyhemoglobin in fluid of Ascaris 253-258 



Pegomyia — 

 affinis — 



distribution 240 



life history 240-243 



hosts 240 



leaf-miner on dock 229-244 



calyptrata — 



distribution 230 



hosts 230 



leaf-miner on dock 229-244 



life history 230-237 



natural enemies 237-238 



hyoscyami, host of Nobis ferus 238 



Spp., leaf-miners on dock 229-244 



vicina. See Pegomyia affinis. 

 Pentoxid, phosphorus, in corn grown with 



barium and strontium compounds 193 



Pkleum pralense, host of Puccinia gramimis 



avenae 58-77 



Phosphate — 

 acid — 

 effect on — 



ash content of spinach 15-25 



nitrification of acid soils 27-42 



in spinach 18-25 



ammonium, effect on nitrification of acid 



soils 27-42 



Phosphorus — 



effect on nitrification of acid soils 27-42 



in plants grown with bariiun and strontium 



compounds 189, 191 



in wheat extracts, method for determining. 10-13 

 pentoxid in corn grown with barium and 

 Strontium compounds 193 



Page 



Physoderma Disease of Corn (paper) 137-154 



Physoderma zeae-maydis — 



control 152-153 



description of causal organism 144 



dissemination 150-152 



germination of sporangia 145-146 



hosts 142 



overwintering of sporangia 149 



symptoms 142-143 



Pine, Australian. See Casuarina equisetifolia. 

 Plant growth, effect of barium and strontiiun 



compounds 183-194 



Pollen, foreign, influence on development of 



vanilla fruits 245-252 



Potash— 

 in corn grown with barium and strontium 



compounds iga 



solubility in epidote, chrysolite, and musco- 



vite 259-261 



Potash-silica ratio in ash of spinach 18-25 



Potash-soda ratio in ash of spinach 23-25 



Potassium — 

 carbonate, effect on nitric nitrogen in soil. 112-135 

 chlorid — 



effect on nitric nitrogen in soil 112-135 



in spinach 17-25 



effect on nitrification of acid soils 27-42 



in plants grown with barium and strontium 



comjxjunds 189, 191 



nitrate, effect on nitric nitrogen in soil. . . 112-135 

 sulphate, effect on — 



ash content of silage 15-25 



nitric nitrogen in soil 112-135 



Potato, Irish. See Solanum tuberosum. 



Potato-wilt of potatoes tmder irrigation 279-303 



Protein — 

 in plants grown with barium and strontium 



compounds 189-191, 193 



Prussic acid. See Acid, prussic. 

 Pseudomonas — 

 aeruginosa — 



causing blue pus 334 



denitrifier 335-337 



caudalus — 



action on milk 346 



action on sugars and glycerin 344-345 



ammonifi cation of soil 329-332 



chromogenesis 343-344 



diastatic action on starch 346 



growth in sterilized manured soil 322-325 



liquefaction of gelatin 344 



morphology 342-343 



physiology 344 



production of indol 346 



reduction of nitrate 345 



relation to oxygen 344 



fiuorescens — 



action on milk 342 



action on sugars and glycerin 339-340 



ammonification of soil 329-332, 339 



cultural characters 338-339 



diastatic action on starch 341 



growth in sterilized manured soil 322-325 



liquefaction of gelatin 339 



morphology 338 



reduction of nitrate 340-341 



relation to oxygen 339 



