836 



INDEX OF SUBJECTS 



Nephrotoxin, 201 



Neufeld and Rimpau's discovery of 



opsonic substances, 282 

 Neurotoxin, 201 

 Neutral-red medium for colon-typhoid 



differentiation, 138 

 "New tuberculin" (Koch), 491 

 "New tuberculin-bacillary emulsion," 



492 



Nitrate-solution broth, 126 

 Nitrifying bacteria, 57 



action of, 58 



agricultural importance of, 58 

 Nitrogen, for preparation of anaerobic 



conditions, 151 



Nitrogen fixation by bacteria, 54 

 microorganism of, 54 



in root tubercles, 55 

 experimentation on, 56 

 microorganism of, 55 

 process of, 56 



in soil, 54 

 Nitrogen in nutrition of bacteria, 28 



sources of supply of, 28 

 Noguchi's modification of Wasser- 



mann test for syphilis, 269 

 Novy jar, 154 



Nucleus in bacterial cell, 10 

 Nutrient media. See Culture media 

 Nutrition of bacteria, 25 



carbon in, 25 



hydrogen in, 28 



nitrogen in, 25 



oxygen in, 25 



salts in, 29 



OBERMEIER, discovery of spirochaetes 



of relapsing fever by, 605 

 Obligatory aerobes, 25 

 Obligatory anaerobes, 26 

 Oi'dium albicans, 640 



discovery of, 640 



morphology of, 640 



varieties of, 640 

 "Old tuberculin" (Koch), 491 

 Opium production, bacteria in, 719 

 "Opsonic coefficient of extinction," 286 

 Opsonic index, finding of, 286 



Opsonic test, Wright's, 284. 



obtaining of bacterial emulsion for, 



284 



of blood serum for, 284 

 of leucocytes for, 284 

 opsonic index in, finding of, 286 

 parallel control test on normal 



serum in, 285 

 "pool" in, 285 

 technique of, 284 



Simon, Lamar, and Bispham's tech- 

 nique of, 286 

 dilutions in, 286 

 opsonic coefficient of extinction in, 



286 

 Opsonins, 281, 316 



decrease of phagocytic power upon 

 introduction of bacteria without, 

 282 



definition of, 282 

 increase of phagocytic power upon 



introduction of, 283 

 Neufeld and Rimpau's discovery of, 



282 



normal and immune, 282-283 

 specific for typhoid bacillus, 424 

 specificity of, 282 

 structure of, according to Hektoen 



and Ruediger, 283 

 Wright's test of. See Opsonic test 

 Wright's theory of, 282 

 Orthocresol as disinfectant, 78 

 Oscillaria malarise, 764 

 Osmotic properties of bacterial cell, 23 

 Oxydases, 50 

 Oxygen as disinfectant, 88 



in development of bacteria, 25 

 free, 26 



absence of, 26 

 indirect supply of, 26 

 in nutrition of bacteria, 25 

 Oysters, bacteriological examination of, 



718 

 Ozone as disinfectant, 88 



PALTAUF'S modification 



stain, 103 

 Pancreascytotoxin, 201 



of Gram's 



