1268 
Journal of Agricultural Research 
Vol. XXVIII 
Page 
Paratylenchus nanus infestation of zinnia 
roots.. 1064-1065 
Parosela arborescens, indicator of land value 
and possibilities.. 113,122 
Pasture, gains of steers, effects of winter 
rations.. 1215-1232 
Patellina fragaria, cause of tan rot of straw¬ 
berries.. 645 
crossing, gamete production. 1247-1252 
mutations in cross breeding. 1247-1252 
Pecan- 
scab, and sources of early spring infections 321-330 
trees, spraying, difficulties. 328 
Pecans— 
growing in Southeast, and distribution of 
scab... 321 
spraying for scab-control experiments_ 326-327 
varietal susceptibility to scab.. 322,325 
Peels, apple, quercetin isolation and identi¬ 
fication. 1243-1245 
Pellagra, relation to Oospora vertidlloides on 
com, discussion. 918 
Peltier, George L., and Frederich, William J.: 
Further Studies on the Relative Suscepti¬ 
bility to Citrus Canker of Different Spe¬ 
cies and Hybrids of the Genus Citrus, 
etc. 227-239 
Relation of Environmental Factors to 
Citrus Scab Caused by Cladosporium 
eitri Massee. 241-254 
Pests, grain, literature citations. 1116 
Pezizella lythri, cause of tan brown rot of straw¬ 
berries. 647,648 
Pharmacology, gossypol. 191-198 
Pharynx, apple maggot larvae... 8-15 
Phenol, effect on nitrification of cyanamid... 53-54 
Phlox, Cephalobus occurrence. 1059-1061 
Phosphorus- 
determination in meats... 340 
nitride, nitrification, comparison with am¬ 
monium sulphate. 1117-1118 
Photoperiodism of Tephrosia Candida . 445-460 
Physalospora malorum — 
comparison with Botryosphaeria ribis . 596-597 
on currant..... 583-588 
spores from apple and currant, comparison. 585- 
586 
Phytophthora cadorum, cause of leather rot of 
strawberries.. 357,358-366,646,647,648 
Pickleweed— 
association on Southwestern desert soils... 764- 
766,796-797,800 
indicator of land value and possibilities.... Ill, 
118,121,122,126,127 
Picric acid- 
effect on glucose and fructose. 480-481 
method of sugar determination, modifica¬ 
tions.... 479-488 
purifying for sugar tests. 485-486 
Pfemeisel, R. L., and Shantz, H. L.: Indica¬ 
tor Significance of the Natural Vegetation 
of the Southwestern Desert Region.. 721-802 
Pigeons, feeding with poultry flesh and eggs, 
experiments. 462-471 
Pima cotton- 
comparison with Upland varieties in Ari¬ 
zona... 938-954 
fiber, salt content. 293-295 
Pine- 
lands, central Idaho, growth and reproduc¬ 
tion of pine and Douglas fir__1139-1147 
lumber, growth in Douglas fir stands. 1237, 
1239,1240 
reproduction after logging_ 1152-1154,1157 
western- 
white, germination, relation to surfaces.. 1151- 
1154 
white, seed, fall sowing and delayed ger¬ 
mination.....- 1127-1131 
yellow, growth on cut-over and virgin 
lands in central Idaho....1139-1148 
yellow, losses in central Idaho, causes. 1143-1145 
Pines— 
blister rust infection at Kittery Point, 
Me v and effect of Ribes eradication... 1253-1258 
hard, immunity to blister rust... 74 
infection by blister rust, relation to size and 
density of stand. 1255-1257 
Page 
Plant- 
communities on desert soils, detailed de¬ 
scription .. 730-779 
growth, effect of varying the day length.. 451-453 
succession, relation to sap density. 892-895 
Plants— 4 j 
desert— j>g 
associated on southwestern desert region, J 
description.. 730-779 
list, with botanical names__ 731 
dioecious, sex reversal, discussion__ 1079 
food supply, seasonal variations- 891-892 
growth and reproduction, relation to sap 
density. 895-896 
semiarid, indicators of land values.100-127 
structure and physiology, variation with 
environment_ 896-89* 
susceptibility to curly-top disease.314-315 
Plasmodiophora brassicae , infection, relation of 
soil temperature and soil moisture. 549-562 
Platygaster vernalis — 
egg description and development. 830-833 
life history and embryonic development- 829-83* 
polyembryonic development.. 829-84* 
Plodia interpunctella , control in warehouses 
by fumigation .... 649,65* 
Pluchea sericea , indicator of land value. 113,122,127 
Poa spp., infection with Pucdnia graminis 
poae and inoculation experiments. 541-543 
Poisoning, gossypol, metabolism of animals. 192-194 
Polish wheat, crosses with vulgare species. 1019-1031 
Polyneuritis in pigeons, cause, feeding tests. 464-469 
Polysaccharides in sweet corn. 427-431 
Pomeroy, C. S.: Bud Selection as Related to 
Quality of Crop in the Washington Navel 
Orange. 521-52* 
Pondrus trifoliata, susceptibility to citrus 
canker............. 227,230 
Porcupines, injury to young trees, western 
yellow pine and Douglas fir.1143,1145 
Pore, formation in aecidiospores of Pucdnia 
podophylli . 925 
Pork, Ascaris-infected hogs, experiments in 
sensitization.... 579 
Posey, G. B., and Ford, E. R.: Survey of 
Blister Rust Infection on Pines at Kittery 
Point, Me., etc..*. 1253-1253 
Potassium— 
di-hydrogen phosphate, effect on wheat 
growth. 387-393 
effect on orange tree growth and composi¬ 
tion.... 278,281,283 
Potato beetle, insecticides... 398,400 
Poteriostomum spp., parasite of Equidae... 666,667 
Poultry- 
consumption per capita, comparison with 
other meats. 461 
flesh, vitamin content. 461-472 
Powder-post beetle, temperature fatal to, 
determination.. 1033-103* 
Powick, Wilmer C., and Hoagland, Ralph: 
The Chemical Composition of Edible Vis¬ 
cera from Meat-Producing Animals. 339-346 
Promycelia, orange rust on blackberries.. 1047-1050 
Protein, decomposition by Badllus larvae . 155-157 
Pucdnia— 
graminis— 
avena, races, resistance of oat varieties.. 705-720 
in the United States......... 541-548 
varieties, comparisons and hosts. 543-547 
podophylli— 
aecidiospores, description, and expulsion 
method. 923-926 
raayapple rust, expulsion of aecidio¬ 
spores... 923-926 
spp., rusts of rye and barley, aecial 
stages.. 1119-1126 
Quercetin— 
a flavonol pigment in apple peel... 1243,1245 
from apple peel, isolation and identifica¬ 
tion..:..... 1243-1245 
Rabbitbrush, indicator of land value. 109, 
117,118,120-126 
Rabbits, feeding with gossypol, experiments 191-196 
Rainfall- 
effect on spread of bean disease. 493-495 
relation to— 
curly-top. 302 
strawberry leather rot. 367-371 
