Index 



709 



Virulence, increase of, by passage 



through animals, 77 

 by use of collodion sacs, 77 

 number of bacteria influencing, 



78 



Von Pirquet's dermo-tuberculin 

 reaction, 378 



WALKER and RideaFs method of 

 testing germicidal value of solu- 

 tions, 271 

 Washed leukocytes in testing 



opsonic value of blood, 277 

 Water, bacteria in, method of 



determining number, 253 

 Winslow and Willcomb's 

 method of direct enumera- 

 tion of, 254 

 bacteriology of, 253 

 colon bacillus in, 572 



MacConkey's medium for 



detecting, 574 

 Wiirtz's medium for detect- 

 ing, 573 

 typhoid bacillus in, Starkey's 



method of isolating, 546 

 Welch and Nuttall's method of 

 staining Bacillus aerogenes cap- 

 sulatus, 662 

 Welch's method of staining dip- 



lococcus pneumoniae, 330 

 Wertheim's method of cultivation 

 of micrococcus gonorrhoeas, 313 

 Wesbrook's types of Bacillus 



diphtherias, 473 

 Whey, Petruschky's, as culture 



medium, 207 

 Widal reaction, 130, 558 

 Winslow and Prescott's method of 



preparing litmus, 206 

 Winslow and Willcomb's method 

 of direct enumeration of bacteria 

 in water, 254 



Wplfhiigel's apparatus for count- 

 ing colonies of bacteria upon 

 plates, 253 

 Wooden apparatus, sterilization 



of, 176 



tongue, 431, 438, 439 

 Wound as avenue of infection for 



tubercle bacillus, 367 

 disinfection of, 185 

 infection, 284 



Wright's method of cultivation of 

 micrococcus gonorrhoeae, 



of enumerating bacteria in 



fluid, 255 

 of making anaerobic cultures, 



231, 234 



Wiirtz's medium for detecting 

 colon bacillus in water, 573 



X-RAYS, influence of, on growth 

 of bacteria, 42 



YELLOW fever, 583 



bacillus of, 583 



mosquitos and, 590 



prophylaxis, 592 

 Yer sin's serum, 637 

 Young's method of cultivating 

 micrococcus gonorrhoeae, 313 



ZENKER'S fluid, 158 

 Ziehl's carbol-fuchsin, 167, 353 

 method of staining Bacillus of 



typhoid, 537 

 tubercle bacillus, 353 

 Zieler's method of staining, 165 

 Zopf's bacterium pneumoniae, 342 

 Zymogens, 47 



