280 



BACTERIA IN RELATION TO PLANT DISEASES. 



Page. 



Needles, platinum-iridium, for making trans- 

 fers 43 



Negatives, 



development of 14 



records on 142 



Nessler*s test, how used 61 



Neisser's spore-stain 104 



Neumann, variability of pigment- formation . . . 238 



Neutral red 230 



Nicolle, modification of Gram's method 222 



Night-blue, 



capsule-stain 221 



stain for flagella 220 



Nitrate bacteria, 



fluid culture-medium for isolation of 199 



nutrient agar for isolation of 109 



Nitrate bouillon 63 



diphenylamin test 267 



Nitrates, reduction of, test for 63 



Nitrifying organisms, magnesia-gypsum blocks 



for 200 



Nitrite bacteria, fluid medium for isolation of. 199 



Nitrites, test for 63 



Nitro-bacteria 175 



Nitrogen-assimilating soil-bacteria, medium 



for 199 



Nitrogen-bacteria 175 



Nitrogen-free media 51, 198 



Nitrogen, 



fixation of, by bacteria 64 



growth in, apparatus for testing 58 



removal of oxygen from 57 



Nitrogen-nutrition, a basis for classification.. 175 



Nitrogen salts, in special media 51, 197 



Nitromonas 240 



Nitrous and nitrate bacteria 175 



Nomenclature 154 



Non-halation plates, uses of 136 



Novy, 



a new thermoregulator 228 



jar for anaerobic cultures 56, 57, 58, 231 



Nucleus, existence of, in bacteria. 159,216,217,219 

 Nutrient material, amount needed by bac- 

 teria 225 



Objectives, achromatic, 



disadvantages of 140 



of excellent definition 265 



Objectives, apochromatic, 



Spencer 16 mm 140 



Zeiss 130 



Occlusion of vascular system due to bacteria . . 8, 12 



Oculars 130 



for photomicrography 139 



Ohlmuller, germicidal action of ozone ^51 



Oleomargarine, bacteria in 259 



Olive-knot organism, 



artificial inoculations 10 



crystals produced by 66 



optimum temperature for 85 



Omelianski, 



blocks for nitrifying organisms 200 



isolation of hydrogen-cellulose ferment. 106, 209 



sodium-formate medium 50 



spore readily stained by anilin dyes 22 



Page. 

 Optimum reaction of medium for bacterial 



growth 69 



Optimum temperatures 75, 85 



Origin of bacteria 177 



Ortol developer 140 



Ostwald-Pfeffer water-bath 78 



Oven, paraffin no 



Oversteaming, effect of 98 



Oxidases 67 



Oxidation, pigments due to 66 



Oxygen, 



compressed, where obtained 81 



little, in deep layers of agar 230 



pigment- formation, dependent on 238. 230 



removal from hydrogen, nitrogen, and car- 

 bon dioxide 57 



Oxygen, relation of bacteria to, in, 



fermentation-tubes 52 



surface and deep growths 51 



Ozone, action on bacteria 251, 252, 253 



Pacinia 172 



Pake, ruled counting-plate 36 



Paper, 



blue-print, for pen-and-ink work 150 



drawing-board 266 



salted silver, for pen-and-ink work 150 



Paraffin, 



infiltration with 118, 226 



melting point of that used for embedding. . . 119 



recommended for cotton plugs 99, 263 



trueing edge of blocks 123 



Paraffin-oven 1 19 



Parasite, 



relation of, to tissues of host 8, 10 



reaction of host to 8 



means of gaining access to tissues of host. 8,92 



Parasites, animal, harbored by plants 89 



Paratrophic bacteria I7S 



Parenchyma, intercellular spaces of, occupied 



by bacteria 8 



Park, effect of freezing on B. typhostis 247 



Pasteur, 



culture-fluid 197 



definition of ae'robe and anaerobe 230 



influence on bacteriology IS 2 



Pathogenesis, rules of proof 9 



Pathogenicity, 



developed by association 72, 215 



of plant parasites to animals 88 



regeneration of 237 



Pane, Pneumococcus, origin of capsule 221 



Payen, agar-agar, composition of 223 



Pear-blight organism, 



action of light on 7 l 



blackening of foliage attacked by 65 



differentiated from B. coli by KNO 3 51, 113 



hosts of 87 



natural infection 9 2 



result of inoculations with 202 



Pedesis i 



Peirce, root-tubercles of bur clover 64 



Pelargonium, natural infection in 92 



Pencils for writing on glass m 



Pepsin 66 



