Oct. i, 1920-Mar. is, 1921 



Index 



903 



Potassium — Page 



chlorid — 



adsorption by plants 616-61 7 



effect on concentration of soil solution 393 



concentration in orthoclase solutions not a 

 measure of its availability to wheat seed- 

 lings 615-621 



fluorid, effect on yield of volatile oil from 



Chinese colza seed 130-131 



hydroxid, effect on yield of volatile oil from 



Chinese colza seed 130-131 



in cropped and uncropped soils 663-667 



in normal and mottled citrus leaves 1 66- 1 90 



in soil extract 387-394 



in southern poultry feeds 143 



oxid, absorption by plants 616-617 



sulphate, effect on concentration of soil 

 extract 38S-389 



Potato. See Solatium tuberosum. 



Poultry feed mixtures, potential acidity and 

 alkalinity 141-149 



Privet. See Ligustrum aurea. 



Prolin in potato protein 624 



Propionic acid. See Acid, propionic. 



Protein — 



calories in various poultry feeds 147 



crystals due to potato blackleg 326-330 



in Chinese colza seed 127 



in sugar beet top silage 538-540 



in sunflower and com silage 881-8S8 



Proteins, effect on freezing-point depression 

 of seeds 593 



Proteus bacilli in canned ripe olives 377-379 



Pruning — 

 influence in stimulating growth of plants. . 155 

 top, effect on hypertrophy of conifers 258 



Psecadia delliella. Syn. Ethmia delliella. 



Pseitdomon as — 

 citri, influence of temperature and hu- 

 midity 447-506 



japonica, possible name for cowpea-soybean 



nodule bacteria 551 



radkicola. Syn. Bacillus radicicola. 

 tumefaciens, causal organism of bacterial 

 crowngall 295 



Pterophoridac, similarity of one species to 

 Peclinophora gossypiella 827-828 



Pyralidae, similarity of certain species to 

 Pectinophora gossypiella 828-834 



Pyrausta — 

 ainsliei — 



control 843-844 



hosts 837 



seasonal history 839-840 



mibilalis, similarity of P. ainsliei 837 



obumbratalis. Syn. P. ainsliei. 



penitalis, similarity of P. ainsliei 837 



Pyraustinae, similarity of certain species to 

 Pectinophora gossypiella 829-S30 



Pyraustomyia penitalis, parasite of Pyrausta 



ainsliei 843-844 



Pyroderces rileyi, similarity to — 



Peclinophora gossypiella 820 



Telphusa mariona 813 



Zenodochium citricolella 818-819 



Ragweed. See Ambrosia trifida and A. arte- 

 misiaefolia. 



Ram, influence in dissemination of spores of Page 

 Gibber ella saubinetii 12-13 



Rattlesnake venin, inefficacy of echinacea 

 against 75-77 



Reaction, soil, effect on Fusarium-wilt of to- 

 bacco 528-529 



Red clover nodule bacteria cultures, effect on 



mi]k 550 



Red pine. See Pinus resinosa. 



Reducing sugars — 



in grapefruit 359-373 



in sugars in storage 638-653 



Relation of the Calcium Content of Some Kan- 

 sas Soils to the Soil Reaction as Determined 

 by the Electrometric Titration (paper). 855-868 



Relation of the Soil Solution to the Soil Ex- 

 tract (paper) 381-395 



"Resting," relation to chilling of plants 159 



Rhizobaclerium japonicum, name given by 

 Kirchner to soybean nodule bacterium 551 



Rhizopus — 



nigricans, similarity to R. trilici 761 



sp., attacking wheat treated with formalde- 

 hyde 215 



tritici, secretion and action of amylase. . . 761-789 



Rhoads, Arthur S., et al. (paper): Hypertro- 

 phied Lenticels on the Roots of Conifers and 

 Their Relation to Moisture and Aeration 253-266 



Rhus copallina, water lenticels 256 



Rhyncholus lalinasus. Syn. Caulophilus lat- 

 inasus. 



Rhynchophora attacking corn in storage. . 605-614 



Rhynchophorus linearis. Syn. Sitophilus line- 

 aris. 



Rice, growth on calcareous soil 38-58 



Rice Weevil, (Calandra) Sitophilus oryza (pa- 

 per) 409-422 



Ripening of sweetcorn, effect of climatic tem- 

 perature 795-805 



Robinia, host of Gibberella saubinetii 16 



Rootrot of cereals caused by Fusarium spp. 

 and Gibberella saubinetii 2 



Rottboellia exaltata, immunity to Sclerospora 

 spontanea 671 



Rubus, host of Gibberella saubinetii 16 



Rudbeckia — 

 pallida. Syn. Brauneria atrorubens. 

 purpurea. Syn. Brauneria purpurea. 



Rumex — 



britannica, host of Urophlyctis major 313 



crispus, food plant of Pyrausta ainsliei 838 



scutatus, host of Urophlyctis rubsaameni 313 



Rusk citrange, influence of — 



humidity on development of Pseudomonas 

 citri 494-497 



temperature on development of Pseudo- 

 monas citri 471-488 



temperature on growth 459-471 



Russian thistle. See Salsola kali var. tenui- 



folia. 

 Rye. See Secale cereale. 

 Saccharum spontaneum, host of Sclerospora 



spp 669-684 



Salobrana tecomae. Syn. Clydonopteron teco- 



mae. 



