28u 



I^ACniRFA IN Klir.ATfON 'JT) IT^ANT lUSEASIiS. 



rage. 

 Needles, platinum-irirliiuii, for making trans- 

 fers 43 



Negatives, 



development of 140 



records on 142 



Nessler's test, how used 61 



Neisser's sprire-stain TQ4 



Neumann, varialiility of pigment- formation. . . 23S 



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 rgo 



nutrient agar for isolation of 190 



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. too 



Nitrites, test for 63 



Nitro-bacteria 175 



Nitrogen-assimilating soil-bacteria, medium 



for 199 



Nitrogen-bacteria 17,=; 



Nitrogen-free media 51, 19^ 



Nitrogen, 



fixation of, by bacteria 64 



growth in, apparatus for testing sS 



removal of oxygen from S7 



Nitrogen-nutrition, a liasis for classification. . 175 



Nitrogen salts, in special media 51, 197 



Nitromonas 240 



Nitrous and nitrate bacteria I7,S 



Nomenclature 154 



Non-halation plates, uses of 136 



Novy, 



a new thermoregulator 22" 



jar for anaerobic cultu''cs 56. 57, ^S, 231 



Nucleus, existence i'>f, in bacteria. 159,216,217,219 

 Nutrient material, amount needed by bac- 

 teria 225 



Objectives, achromatic, 



disadvant.ages of 140 



of excellent definition 265 



Objectives, apochromatic, 



Spencer 16 mm 140 



Zeiss 130 



Occlusion of \'ascular system due to bacteria.. S, T2 



Oculars 130 



for pbotomicrogr.aphy T39 



Ohlmiiller, germicidal action nf ozone 251 



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 



spure readily stained by anilin dyes 22 



Page 

 Optimum reaction of medium for bacterial 



G-ro«'th 60 



Ontimum temneratiu'es 75. Rq 



Oria-in of bacteria 177 



Ortol develoner i/io 



Ostwald-Pfpffcr water-bath 7S 



Oven, paraffin ITO 



Oversteaming, efl^ect of 08 



Oxidases 67 



Oxidation, pigments due to 66 



Oxygen, 



compressed, where obtained St 



little, in deep layers of agar 230 



pigment-formation, dependent on 238. 230 



removal from hydrogen, nitrocen. and car- 

 bon dioxide 57 



Oxygen, relation of bacteria to, in, 



fermentation-tubes 52 



surface and deep growths 5t 



Ozone, action on bacteria 251, 252, 253 



Pacinia 172 



Piake, ruled counting-plate 36 



Paper, 



blue-print, for pen-and-ink work T50 



drawing-board 266 



salted silver, for pen-and-ink work T50 



P.ar.afi^n, 



infiltration with it8, 226 



melting point of that used for embedding. . . IT9 



recommended for cotton plugs 99, 263 



trueing edge of blocks T23 



Paraffin-oven TT9 



Parasite, 



relation of, to tissues of host 8, 10 



reaction of host to 8 



means of gaining access to tissues of host. 8,02 



Parasites, animal, harbored by plants 89 



Paratrophic bacteria T75 



Parenchi'ma, intercellular spaces of, occupied 



by bacteria 8 



Park, effect of freezing on B. typhosus 247 



Pasteur, 



culture-fluid 197 



definition of aerobe and anai;robc 230 



influence on bacteriology T52 



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-a^ar, composition of 22^ 



Pear-blight organism, 



action of light on 71 



blackening of foliage attacked by 65 



differentiated from B. coli by KNO... ... 51, 113 



hosts of 87 



natural infection 92 



result of moculations with 202 



Pedesis 10 



Peirce, mot-tuLicrcles of bur clover 64 



.I'elargonium, natural infection in 92 



Pencils foi' writing on glass 111 



Pepsin 60 



