280 



BACTERIA IN RELATION TO PLANT DISEASES. 



Page. 



Needles, platinum-indium, for making trans- 

 fers 43 



Negatives, 



development of 140 



records on M 2 



NYssler's test, how used 61 



Neisser's spore-stain 194 



Neumann, variability of pigment- formation. . . 238 



Neutral red 230 



Nicolle, modification of Gram's method 222 



Night-blue, 



capsule-stain 221 



stain for fiagella 220 



Nitrate bacteria, 



fluid culture-medium for isolation of 199 



nutrient agar for isolation of 199 



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 



N i I rogen-bacteria 175 



Nitrogen-free media S r J 9S 



Nitrogen, 



fixation of, by bacteria 64 



growth in, apparatus for testing. . 



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 '4 



i . I excellent definition 265 



Objectives, apochromatie. 



Spencer lO mm 14 



Zeiss .....130 



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



Oculars r 3O 



for photomicrography 139 



Ohlmuller, germicidal action of ozone ^51 



Oleomargarine, bacteria in 259 



Olive-knot organism, 



artificial inoculations JO 



crystals produced by 00 



optimum temperature for 85 



Omelianski, 



blocks lor nitrifying organisms 2OO 



isolation of hydrogen-cellulose ferment. 100,209 



sodium li'imute medium 5 



1>< >ie readily stained by anilin dyes 22 



Page. 

 Optimum reaction of medium for bacterial 



growth 69 



Optimum temperatures . 75. 5 



Origin of bacteria 177 



Ortol developer 140 



Ostwald-Pfeff er water-bath 78 



Oven, paraffin . H9 



Oversteaming, effect of 9 



Oxidases 67 



Oxidation, pigments due to 66 



Oxygen, 



compressed, where obtained 81 



little, in deep layers of agar. . . 230 



pigment-formation, dependent on 238, 239 



removal from hydrogen, nitrogen, and car- 

 bon dioxide 57 



Oxygen, relation of bacteria to, in, 



fermentation-tubes 5 2 



surface and deep growths 5 1 



Ozone, action on bacteria 251, 252, 253 



Pacinia T " 2 



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 I2 3 



Paraffin-oven T ! 9 



Parasite, 



relation of, to tissues of host.. 8, 10 



reaction of host to 



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



Parasites, animal, harbored by plants 89 



Paratrophic bacteria 



Parenchyma, intercellular spaces of, occupied 

 by bacteria 



Park, effect of freezing on B. typhosus 247 



Pasteur, 



culture-fluid J 97 



definition of aerobe and anaerobe 230 



influence on bacteriology '52 



Pathogenesis, rules of proof. . 9 



1'athogenicity, 



developed by association 



of plant parasites to animals. . 

 regeneration of 



Pane, Pneumococcus, origin of capsule 



Payen, agar-agar, composition of 223 



Pear-blight organism, 



action of light on 7 1 



blackening of foliage attacked by 65 



differentiated from B. coli by KNO 3 . ... 5', "3 



hosts of 8 7 



natural infection 9 2 



result of inoculations with 202 



Pedesis 



Peirce, root-tubercles of bur clover 64 



Pelargonium, natural infection in 



Pencils for writing on glass 



Pepsin 



in 

 00 



