576 



Journal of Agricultural Research 



Vol. IV 



Protozoa— Continued. Page 



soil — Continued, 

 development of — 



from compost soils S27 



in culture solutions 5i7~556 



effect of temperature on development 



of 542-SS7 



method for counting 511-516 



Pseudomonas citri, description of 99-100 



Pseudomonas Citri, the Cause of Citrus Can- 

 ker (paper) 97-100 



Pseudotsuga — 



douglasii, host plant of Rhizina infiata 93 



taxifolia — 



distillation of, comparison with Macro- 



cyslis pyrifera 55 



host plant of Rhizina inflaia 94 



Psidium g^iajava, food plant of Diaprepes 



spengleri spengteri 261 



Puccinia graminis — 



avenue, inoculation of i94 



growth of, in host plants 195-19^ 



histology of hyphal invasion of 195-198 



hordei, inoculation of i94 



hyphae of 195-198 



immunity of certain plants to 193-198 



resistance of certain plants to 193-198 



tritici, inoculation of i94 



Pythium debaryanum — 

 causal organism of damping-off of Beta 



vulgaris 159-161, 164 



resemblance of, to Rheosporangium aphani- 



derm aiuin 2 79 



Quality, inheritance of, in Vilis spp 323-324 



Quercus spp., distillation of, comparison -with 

 Macrocysiis pyrifera 55 



Radish. See Raphanus sativjts. 



Raphanus sativus, host plant of Rheosoporan- 



gium aphanidermatum 279-292 



Razoumofskya — 



americana, host plant of W allroikiella arceti^ 



thobii 372 



douglasii, host plant of W allroikiella arceu- 



thobii 372 



pusilla, host plant of Wallrothiella arceu- 



thobii 370-372 



Relation between Puccinia Gramixiis and 

 Plants Highly Resistant to Its Attack 



(paper) 193-200 



Rheosporangiutn — 



description of 291 



aphanidermatum — • 



description of 291 



life history of 279-2S3 



morphology of 279-2S9 



Tesemblance to Pythium debaryanuin 279 



taxonomy of 2S9-291 



Rheosporangium Aphanidermatum, a New 

 Genus and Species of Fungus Parasitic on 



Sugar Beets and Radishes (paper) 279-293 



Rhizina — 

 infiata — 



host plants of 93-94 



observations on 93-96 



parasitism of 93"94 



uiidulata, syn. Rhizina inflaia. 



Rhizoctonia sp. — Page 



causalorganismof diseases of Be/a i'«/<7ar!i. . 151- 



159.165 



conditions influencing infection by 155-159 



description of 153 



distribution of 154-155 



inoculation of Beta vulgaris with 153-154 



Rhizopus nigricans, causal organism of root 



sickness of Beta vulgaris 163-164 



Ricinus communis, food plant of Diaprepes 



spengleri festivus 262 



Rietz, H. L., and Roberts, E. (paper). De- 

 gree of Resemblance of Parents and Off- 

 spring with Respect to Birth as Twins for 



Registered Shropshire Sheep 479-510 



Ripening season, effect of heredity on, in Vitis 



spp 326-327 



Roberts, E., and Rietz, H. L. (paper) De- 

 gree of Resemblance of Parents and Off- 

 spring v.-ith Respect to Birth as Twins for 



Registered Shropshire Sheep 479-510 



Roberts, J. \V. (paper) Sources of the Early 



Infections of Apple Bittcr-Rct 59-64 



Root, production of, relation to antagonism 



between anions 211 



Root louse, sugar-beet, influence of soil mois- 

 ture upon increase of 241-250 



See also Peniphigus betae. 

 Root-rot, relation of, to seedling diseases of 



Beta vulgaris 135-168 



Root sickness — 



description of 135-136 



occurrence of, on Beta vulgaris 149- 



152,154,163-164 

 Rosa spp., food plants of Diaprepes spengleri 



spengleri 261 



Ross, E. L., Keith, M. H., and Grindley, H. 

 S. (paper) Phosphorus Metabolism of Lambs 

 Fed a Ration of Alfalfa Hay, Com, and Lin- 

 seed !Meal 459-473 



Rot- 

 bitter, of apple, sources of early infections of 59-64 

 crown, relation of, to seedling diseases of 



Beta vulgaris 135-168 



dry, of Solanum tuberosum, caused by 



Spongospora subterranea 272-273 



field, occurrence of, on Beta vulgaris 144-145 



fruit, of Lycopersicoti esculentum 1-20 



root, relation of, to seedling diseases of 



Beta vulgaris 135-168 



storage, occurrence of, on Beta vulgaris . . . 144-145 

 Ruehle, G. L. A. (paper ) Methods of Bacterial 



Analyses of Air 343-36S 



Rye. See Secale cereale. 



SaccharuTn officinarum — 



food plant of Diaprepes spp 255-264 



root disease of 561-568 



Salts- 

 effect of — 



on physical properties of soil 191-192 



on physical properties of soil solutions. . . 1S7 

 fertilizer, effect of, on moisture content of 



soils 1S9-191 



relation of — • 



to growth of plants 215 



to nitrification of soil 213-215 



toxicity of, for Hordeum spp 203, 214-216 



Sap, cell, color substance of 295-296 



