INDEX. 



365 



PAOB. 



Plant hygiene 188 



Plant inspection, sea ports 188 



Plant parasites, parasitic on animals 174 



Plasmodiophora brassicae, role of bacteria in devel- 

 opment of 1 70 



Plum, black-spot, 



(See black-spot of plum and Bact. pruni.) 



Podwyssotsky, kefir 161 



Polysphondylium violaceum, bacterial parasite 172 



Popenoe, aresnate of lead, insecticide 203 



Poplar, Lombardy, supposed bacterial disease of . . . 10 

 Potassium bichromate, 



effect on germination of oats 198 



effect on germination of wheat 198 



Potassium cyanide, effect on germination of corn ... 1 99 

 Potassium permanganate, effect on germination of 



corn 1 99 



Potassium sulphide, 



effect on germination of barley 200 



effect on germination of oats 198, 200 



effect on germination of wheat 200 



Potato, 



bacterial wet-rot of 9 



basal stem-rot, occulsion of vessels 4 



brown-rot, 



(See Bacterium solanacearum.) 



cellular-rot 9 



immunity of old tubers 48 



Potato-rot, Appel's, 



(See also Bacillus phytophthorus.) 



duration of disease 66 



reaction of host 90 



tissues attacked 69 



transmission of 1 89 



varieties susceptible 95 



Potato soft-rots, tissues attacked 69 



Potato, surface flora of tubers * . . . 31 



Potato-tubers, 



lenticellate infection 64 



resistant varieties, composition 48 



Potter, 



bacteria on the surface of leaves 35 



black-rot of cruciferous plants 306, 332 



cell-wall penetrated by bacteria 77 



effect of chloroform on turnip white-rot organism . 82 



enzym from soft-rot organism 78 



solution of middle lamella 76 



Potts, myxomycetes, bacteria in cultures of 169 



Prazmowski, 



root-nodule organism, Leguminosae, fixation of 



free nitrogen 107 



root-nodules. Leguminosae, 



bacteroid formation 126 



infection 114 



pure-culture inoculations 124 



Predisposition to disease 36 



Premature development of organs 90 



Prillieux, 



bacterial diseases of plants, views on 13 



contributions to plant bacteriology 7 



Protargol 193 



Protection of plants against bacteria 28 



Protective substances in plants 29 



Proteolytic enzyms 83 



Prucha, black-rot of crucifers 332 



Pruning, 



distribution of disease due to 190 



protection by 191 



Pseudomonas destructans, incubation period 65 



Pseudomonas radicicola 133 



(See also root-nodule organism, Leguminosae.) 



symbiosis with Azotobacter 172 



Pseudorhizobium ramosum 99 



Pumpkin-blight 209 



(See cucurbit wilt.) 



PAGB. 



Radiobacter 128 



Radish black-rot, 



(See black-rot of cruciferous plants.) 

 Rape, black-rot, 



(See black-rot of cruciferous plants.) 

 Ravaz, 



schizomycete in vine cuttings 70 



supposed vine parasite pathogenic to rabbits 181 



Reaction to parasitic attack 90 



literature 94 



Red spider 202, 203 



Reinke, symbiosis, Volvox and Azotobacter 153 



Reinke and Berthold, contribution to plant bacteri- 

 ology 9, 36 



Resistance, fertilizers, effect of 96 



Resistance, individual and varietal 95 



Resistant varieties, production of 95, 96 



Retting of flax 31 



Rhinanthus major, root-nodules 103 



Rhizobacterium japonicum 99, 100 



Rhizobium beijerinckii 99 



Rideal, disinfectants, testing methods 195 



Rideal-Walker test, disinfectants 195 



Ritzema Bos, black-rot of crucifers 311 



Rogna, saprophytes in 32 



Roots, protection against bacteria 30 



Root-galls, dwarfing of host 92 



Root-nodule bacteria, Leguminosae, groups and 



varieties 105, 129 



one or more species 99, 102, 115, 1 16, 129 



Root-nodule organisms, Leguminosae, 



acid vs. alkaline soils, effect of 108 



bacteroids 103, 104, 105, 115, 117, 118, 124 



bacteroids, effect of chemicals 126 



bacteroids, formation and nitrogen assimilation. . 128 

 bacteroids, formation, nuclear plasma, behavior of 126 



bacteroids, non-germination 136 



bacteroids, sporangial nature of 128 



branched forms 107, 1 13 



chemicals, effect of 126 



chemotropism 117 



classification 114 



cross-inoculations 115 



cultural characteristics 104 



culture media 124, 129, 130 



de Rossi's isolations 137 



desiccation 133 



entrance into host 103 



filaments no 



fixation of atmospheric nitrogen 106 



flagella 135 



Gram's stain 127 



growth in nitrogen 107 



infection, manner of 103, 105 



infection, mechanics of 119 



infection experiments 1 1 1, 1 14, 1 19, 135 



infection filament 103, 111,119 



infection through root hairs 103 



inoculations 97 



isolation in 



longevity 105 



medium free from combined nitrogen 98 



microscopic characters 113 



nitragin 1 13 



nitrogen assimilation 129, 132 



nitrogen determinations from cultures 133 



nutrition, effect of 1 17, 1 18 



parasitism 132 



pure cultures, effectiveness of 128 



saprophytes 1 07 



seed inoculation 132 



soil inoculations 99, 102, 1 16, 



120, 121, 122, 123, 130, 133 



sources of nitrogen 106, 107 



staining 109, 118, 127, 135 



