430 
Journal of Agricultural Research 
Vol. IX 
Pectinophora gossypiella — Page 
characters. 346 
control. 356-362 
description. 346-351 
dissemination. 358 
food plants. 358-359 
identification. 3 46-3 51,362-366 
life history. 35* - 354 
origin. 345-340 
parasites of. 359-301 
reaction to light. 354-356 
resemblance to Pyroderces rileyi . 362 
Pedicuioides ventricosus, parasite of Pectino- 
phora gossypiella . 361 
Phleum praiense , host plant of Cerodonta 
femoralis . 18 
Pig— 
effect of heat of sun on temperature of... 167-183 
effect of muscular exercise on temperature 
of. 167-183 
morphology of blood. 131-140 
Pimpla hawaiensis, parasite of Pectinophora 
gossypiella . 359 
Pink Bollworm, The (paper). 343-370 
Pink bollworm. See also Pectinophora gossy¬ 
piella. 
Plant— 
absorption of nutrients by roots. 73-95 
“ Pod corn.” See Zea tunicata. 
Potassium- 
absorption by roots. 83-84 
salts, effect on the fixation of ammonia by 
soils. 151 
Potato. See Solanum tuberosum. 
Poultry, use in control of Pectinophora gossy¬ 
piella . 361-362 
Privet. See Ligustrum aurea . 
Pyroderces rileyi — 
description. 362-366 
resemblance to Pectinophora gossypiella .. 362-366 
Rainfall, effect on the distribution of nitrates 
in Citrus soils. 244-248 
Ramsey, G. B. (paper): A Form of Potato 
Disease Produced by Rhizoctonia.421-426 
Relation of the Transformation and Distribu¬ 
tion of Soil Nitrogen to the Nutrition of 
Citrus Plants (paper). 183-252 
Relation of Water-Retaining Capacity of a 
Soil to Its Hygroscopic Coefficient (paper).. 27-71 
Rhizoctonia — 
solani — 
occurrence on Solanum tuberosum .413-419 
comparison with Rhizoctonia crocorum . 418-419 
spp., causal organisms of a disease of Sola¬ 
num tuberosum . 421-426 
Rice. See Oryza sativa. 
Root, absorption of nutrients by. 73-95 
Rootrot— 
black, of Malus sylvestris. Syn, Xylaria 
rootrot. 
Xylaria— 
cultural characters. 2 74-2 75 
description. 270-272 
distribution. 269-270 
losses. 270 
Rootrot—Continued. Page 
Xylaria—Continued. 
occurrence on Malus sylvestris .269-276 
pathogenicity. 275-276 
Rosenbaum, J., and Shapovalov, M. (paper): 
A New Strain of Rhizoctonia solani on the 
Potato.413-419 
Scavenger bollworm. See Pyroderces rileyi. 
Schroeder, B. C. ( and Cotton, W. B. (paper): 
Some Facts about Abortion Disease. 9-16 
Seamans, H. B. (paper): Wheat-Sheath 
Miner. 17-25 
Season, influence on soil bacteria. 299-300 
Shantz, H. B., and Briggs, B. J. (paper): 
Comparison of the Hourly Evaporation 
Rate of Atmometers and Free Water 
Surfaces with the Transpiration Rate of 
Medicago sativa. 277-292 
Shapovalov, M., and Rosenbaum, J. (paper): 
A New Strain of Rhizoctonia solani on the 
Potato. 413-419 
Sheep- 
cause of trembles in...397-404 
effect of Eupatorium ageratoides on. 397-404 
Snakeroot,white. See Eupatorium ageratoides. 
Sodium— 
absorption by roots..... 83-84 
carbonate, effect on solubility of soil miner¬ 
als. 264 
salts, effect on fixation of ammonia by 
soils. 149-155 
Soil- 
bacteria. See Bacteria, soil. 
Citrus, formation of niter spots in. 235-239 
determination of ammonia in. 144 
effect of decomposing organic matter on sol¬ 
ubility of inorganic constituents. 2 53-268 
effect of organic matter on specific con¬ 
ductivity of. 265 
fixation of ammonia in. 141-155 
furrow-irrigated— 
effect on distribution of nitric nitrogen. 204-234 
seasonal variation in nitrates in.206-212 
production of ammonia in.321-337 
recovery of ammonia from. 143-146 
semiarid, effect of dried blood on the nitri¬ 
fying power. 200-204 
effect of salts on solubility of calcium in. 153-154 
effect of inorganic minerals on specific con¬ 
ductivity of. 265 
mineral, effect of decomposing organic mat¬ 
ter on solubility of. 253-268 
moisture distribution. 47-55 
recovery of nitrogen as ammonia in. 188-200 
recovery of nitrogen as nitrates in.188-200 
relation of moisture content to hygroscopic 
coefficient.35-66 
water-retaining capacity, relation to hygro¬ 
scopic coefficient. 27-71 
Solanum tuberosum — 
j host plant of Rhizoctonia solani .413-419 
Rhizoctonia disease of. 421-426 
I Some Facts about Abortion Disease 
| (paper). 9-16 
I Species, new. 3 
