Jan. 7-Mar. 25, 1918 



Index 



739 



Page 

 Polyslictus kirsutus, hymenium, influence of 



substratum on character of 76 



Porlhetria — 

 dispar — 



distribution 459 



factor in dissemination of white-pine 



blister-rust 459-462 



infestation of Pinus spp. by larvae of . . . 459-460 

 infestation of Ribes spp. by larvae of . . . 459-462 



spp., injury to Ribes spp 461-462 



Posey, G. B., and Gravatt, G. F. (paper): 

 Gipsy-Moth Larvae as Agents in Dissemi- 

 nation of the White- Pine Blister-Rust. . . 459-462 

 Potash. See Potassium. 

 Potassium — 

 chlorid, effect on hydrogen-ion concen- 

 tration of soils 146 



in soil — 



effect of crop growth on 311-364 



effect of season on 311-364 



nitrate — 



influence of Bacillus radicicola on 21 1-2 13 



influence on — 



alfalfa nodules 224-226 



alfalfa roots 222-224 



fixation of nitrogen by Azotobacter. . 193-196 

 fixation of nitrogen by Bacillus radici- 

 cola 214-217 



growth of Azotobacter 188, 191 



growth of Bacillus radicicola 208 



nodule formation 223-226 



sulphate, effect on soil reaction 1 . 26-27 



Potato beetle. See Lepiinotarsa decemlincala. 

 Potato- 

 Irish. See Solanum tuberosum. 

 sweet. See I pomoea batatas. 



Poultry, egg production in winter 547-574 



Premnotrypes solani 602 



Propyl acetate, toxicity to insect eggs 581 



Prunus persica, syn. Amygdalus persica. 



Psaliduridae 602 



Pseudotsuga iaxifolia — 



effect of mistletoe on 716-718 



host plant of Razoumofskya spp 716-718 



Psidium — 



cattleianum, food plant of Ccratitis capitala . . 105 

 guajaxa, food plant of Ccratitis capitala .... 105 



Pimky disease 132 



Pure Cultures of Wood-Rotting Fungi on 



Artificial Media (paper) 33-82 



Purgative, use as anthelmintic 399-401 



Pyridin, toxicity to insect eggs 581 



Rabbit— 



toxicity of cottonseed to 88-89 



toxicity of gossypol to ^ 88-89 



Rahm, W. L-, plow bottom, description. . . 178-179 

 Rain, wind-blown, factor in dissemination of 



tobacco wildfire 456 



Rat, toxicity of cottonseed to «3-io4 



Razoumofskya spp., parasite of Psevdotsuga 



taxifolia 716-718 



Reed. H. S., and Batchelor, L. D. (paper): 

 Relation of the Variability of Yields of 

 Fruit Trees to the Accuracy of Field 

 Trials 245-283 



Page 

 Relation of Carbon Dioxid to Soil Reaction 

 as Measured by the Hydrogen Electrode 



(paper) 139-148 



Relation of Kinds and Varieties of Grain to 



Hessian-Fly Injury (paper) 519-527 



Relation of the Variability of Yields of Fruit 

 Trees to the Accuracy of Field Trials 



(paper) 245-283 



Respiration of Stored Wheat (paper) 685-713 



Rhigopsidius iucumanus 602 



Rhode Island Red, winter cycle of egg pro- 

 duction in 547-574 



Ribes spp. — 



food plants of Porlhetria dispar 459-462 



Rose-apple. See Eugenia jainbos. 

 Rosy-aphis stigmonose, resemblance to 



bitter-pit no-iii 



Rot, identification by cultural characters. . . 63-64 

 Roimd-worm. See Ascaridia perspicillum. 

 Rye. SeeSecale cereale. 



Salicylic aldehyde, toxicity to insect eggs 581 



Salmon, S. C, and McColloch, J. W. (paper): 

 Relation of Kinds and Varieties of Grain to 



Hessian-Fly Injury 519-527 



Salt, Epsom, use as anthelmintic 400-401 



Sand. See Soil. 



Santonin and calomel, use as anthelmintic. 420-422 



Santonin, use as anthelmintic 419-420 



Season — 



effect on soil extract 31 1-368 



freezing-point method as index of variations 



in soil solution due to 369-395 



relation to abundance of Diachasma tryoni. . 291 



relation to abundance of Opiiis humilis 291 



variation of concentration of soil solution 



with. 371-382 



Secale cereale, relation to injury by Mayetiota 



destructor 519-527 



Seed, dissemination of tobacco wildfire by. . . 456 



Sharp, L. T., and Hoagland, D. R. (paper): 



Relation of Carbon Dioxid to Soil Reaction 



as Measured by the Hydrogen Electrode. 139-148 



Shaw, R.H., Woodward, T. E., and Norton, 



R. P. (paper): Digestion of Starch by the 



Young Calf 575-578 



Sherman, J. M., and Bechdel, S. I. (paper): 



Corn-Stover Silage 589-600 



Silage, corn-stover 5S9-600 



fermentation 591-599 



imix)rtance of water in production of . . . . 590-591 



Small, James, plow bottom, description 175-177 



Sodium nitrate — 

 effect on hydrogen-ion concentration of soil 



suspensions 26 



influence on — 



fixation of nitrogen by Azotobacter 197 



fixation of nitrogen by Bacillus radi- 

 cicola 214-217 



growth of Azotobacter 188, 191, 207 



growth of Bacillus radicicola 209 



nodule formation 219-220 



Soil- 

 acidity, definition 139 



solubility of calcium in, effect of — 



ammonium sulphate on 674 



calcium carbonate on 674 



tricalcium phosphate on 674 



