Index 



647 



Vibrion septique, 600 

 Vibrionensepticaemia, 469 

 Virulence, 74 

 decrease of, 74 

 increase of, 75 



by addition of animal fluids 



to culture-media, 76 

 by passage through animals, 



75 



by use of collodion sacs, 75 

 number of bacteria influencing, 

 76 



WATER, bacteria in, method of 



determining number, 231 

 bacteriology of, 231 

 Welch and Nuttall's method of 

 staining Bacillus aerogenes cap- 

 sulatus, 604 

 Welch's method of staining dip- 



lococcus pneumoniae, 289 

 Wertheim's method of cultivation 

 of micrococcus gonorrhoeas, 274 

 Wesbrook's types of Bacillus 



diphtheriae, 420 

 Whey, Petruschky's, as culture 



medium, 187 

 Widal reaction, 126, 505 

 different forms, 511 

 dilution of serum for, 510 

 duration, 506 



relation between agglutina- 

 tion and germicidal ac- 

 tivity, 507 



to germicidal activity, 507 

 technic, 508 



time for appearance, 505 

 value of, for diagnosis, 505 



Wplfhiigel's apparatus for count- 

 ing colonies of bacteria upon 

 plates, 231 

 Wooden apparatus, sterilization 



of, 158 



tongue, 376, 383, 384 

 Wound as avenue of infection for 



tubercle bacillus, 325 

 disinfection of, 167 

 infection, 251 



Wright's method of cultivation of 

 micrococcus gonorrhoeas, 

 276 _ 



of making anaerobic cultures, 

 211, 213 



X-RAYS, influence of, on growth 

 of bacteria, 41 



YELLOW fever, 532 



bacillus of, 532 



mosquitos and, 539 



prophylaxis, 541 

 Yersin's serum, 580 

 Young's method of cultivating 

 micrococcus gonorrhoeas, 275 



ZENKER'S fluid, 142 

 Ziehl's carbol-fuchsin, 150, 311 

 method of staining Bacillus of 



typhoid, 487 

 tubercle bacillus, 3 1 1 

 Zieler's method of staining, 149 

 Zopf's bacterium pneumoniae, 301 

 Zymogens, 46 



