Apr. i-Sept. 15, 1921 
Index 
883 
Page 
Oakley, R. A., and Evans, Morgan W. (paper): 
Rooting Stems in Timothy. 173-178 
Oakley, R. A., and Westover, H. L. (paper): 
Effect of the Length of Day on Seedlings of 
Alfalfa Varieties and the Possibility of 
Utilizing This as a Practical Means of Iden¬ 
tification. 599-608 
Oat silage. 771-775 
Observations on the Body Temperature of 
Dry Cows (paper). 1-28 
Ophyra — 
aenescens, dispersion by flight. 743-766 
leucostoma, disperson by flight. 743-766 
spp., dispersion by flight. 736-766 
Orange— 
satsuma. See Citrus nobilis var. unshiu. 
shoots, concentration of cell sap. p3~94 
sweet. See Citrus sinensis. 
trifoliata. See Poncirus trifoliata. 
Organic acids. See Acids, organic. 
Osmotic concentrations in potato wart disease 589- 
592 
Oxalic acid. See Acid, oxalic. 
Oxidase activity in potato wart disease. 589 
Oxygen- 
effect on wound-cork formation. 639-641 
requirements of Bacillus megatherium . 695 
Ox-warble. See Hypodcrma spp. 
Palm, date. See Phoenix dactylifcra. 
Paspalum dilaiatum, determinate stolon. 177 
Pathogenicity of Corticium vagum on the 
Potato as Affected by Soil Temperature 
(paper). 459-482 
Patterson, J. E. (paper): Life History of 
Recurvaria milleri, the Lodgepole Pine 
Needle-Miner, in the Yosemite National 
Park, California. 127-142 
Pea, Canada field, silage. 771-775 
Pear. See Pyrus communis. 
Pectinase, secretion by Rhizopus tritici .609-625 
Ptnicillium — 
africanun, inversion of cane sugar. 189 
brevicaule, inversion of cane sugar. 189 
luteum, effect on plant tissue.... 611 
oxalicum, production of organic acids. 223 
purpurdogenum, inversion of cane sugar.... 189 
sp.— 
cause of potato rot...... 211-226 
glucose as a souice of carbon. 189-210 
susceptibility of injured seeds.99-122 
spp., isolated from potatoes. 828-849 
Pepper, relation of bacterial spot to Bac¬ 
terium exitiosum.. . 125-126 
Periderm formation in sweet potato. 637-647 
Per iota sp., isolated from potatoes. 828 
Pestalozzia sp., isolated from potatoes. 828 
Phaseolus vulgaris, varietal susceptibility.. 385-404 
Phillips, W. J., and Poos, F. W. (paper): 
Life-History Studies of Three Jointworm 
Paiasites. 405 
Phoeniccococcus marlatti — 
control. 666-667 
distribution. 659-660 
natural enemies. 665-666 
stages. 660-662 
Page 
Phoenix daclylifera, host of Phoenicococcus 
marlatti . 669-676 
Phoma sp., isolated from potatoes. 828 
Phormia regina, dispersion by flight. 730-766 
Phosphate- 
calcium— 
crystals in condensed milk. 791 
in ration for pigs. 280-341 
ferric, source of iron for plants. 701-728 
potassium- 
effect on growth of storage-rot fungi. 190 
in ration for pigs. 280-341 
Phosphoric acid. See Acid, phosphoric. 
Phosphorus, assimilation by corn. 545 573 
Pigs, effect of— 
cucurbita seeds 011 metabolism. 528-539 
ration on development.. 279-341 
Pima cotton, variations. 227-242 
Pine— 
Austrian. See Pinus austriaca. 
Corsican. See Pinus laricio corsicana. 
Jeffrey. See Pinus juffreyi. 
lodgepole. See Pinus murrayana. 
Scotch. See Pinus sylvestris. 
tamarack. See Pinus murrayana. 
western yellow. See Pinus ponderosa. 
Pinus — 
austriaca, growth on calcareous soil. 154 
ccntorta, chlorosis. 155 
halepensis, growth on calcareous soil. 154 
jejfreyi, chlorosis. 153-171 
laricio corsicana, chlorosis. 153-171 
murrayana, host of Recurvaria milleri _127-142 
pinaster, poor growth on calcareous soil.... 154 
ponderosa, chlorosis. 153-171 
sylvestrus, calcifuge tendencies. 154 
Plot tests, technic. 483-500 
Poa pratensis, rhizome. i 77 
Polymorphonuclears in blood of horses.... 678-688 
Pomelo. See Citrus grandis. 
Poncirus trifoliata, susceptibility to Clado- 
sporium citri . 344 
Poos, F. W., and Phillips, W. J. ( paper): 
Life-History Studies of Three Jointworm 
Parasites. 405-426 
Populus tremuloides, chlorosis. 155 
Porte, W. S., and Pritchard, Fred J. (paper): 
Collar-Rot of Tomato. 179-184 
Relation of Horse Nettle (Solanum caro- 
linense) to Leafspot of Tomato (Septoria 
lycopersici). 501-506 
Potassium— 
assimilation by com. 545-573 
chlorid, effect on growth of storage-rot 
fungi. I90 
in irrigation water. a7s _ 277 
phosphate— 
effect on growth of storage-rot fungi. 190 
in ration for pigs. 280-341 
Potato aphis. See Macrosiphum solanifolii. 
Potato— 
Irish— 
wart disease. See Chrysophlyctis endobio- 
tica. 
See Solanum tuberosum. 
