Index 



807 



Virulence, increase of, by addition of 

 animal fluids to culture-media, 

 81 

 by passage through animals, 80 

 by use of collodion sacs, 81 

 Viruses, filterable, 28 



invisible, 28 

 Von Pirquet cutaneous reaction for 

 diagnosis of syphilis, 726 

 dermotuberculin reaction, 679 



Wassermann's method of cultivation 

 of Micrococcus gonorrhoeae, 396 

 reaction, 139, 279, 726 

 amboceptor dose in, 286 



unit in, 286 

 antigen in, 279 

 blood-corpuscles for, 283 

 complement for, 282 

 fixation test of, 291 

 hemolytic amboceptor for, 284 

 titration of, 284 

 system in, 286 

 test of, 291 

 nature of, 294 



Noguchi's modification of, 294 

 obtaining blood for, 282 

 reagents employed, 279 

 serum to be tested in, 281 

 technic of, 279, 280 

 theoretic basis of, 280 

 titration of antigen in, 288 

 of guinea-pig serum for, 285 

 of hemolytic serum for, 285 

 of sheep corpuscles for, 285 

 validity of, 294 

 Water, Bacillus coli in, 239 



Smith's method of determining, 

 ,239 

 bacteria in, 50, 237 

 number of, 238 



method of determining, 237 

 bacteriology of, 237 

 drinking, colon bacillus in, 622 

 Water-bath, 254, 255 

 Welch's method of staining Diplo- 



coccus pneumoniae, 44s 

 Wertheim's method of cultivation of 



Micrococcus gonorrhoeas, 39S 

 Whey, Petruschkey's, 199 

 Whooping-cough, 441 

 Widal reaction, 123 



in typhoid fever, 603 



Wildseuche, bacillus of, 566 

 Willcomb's method of counting bac- 

 teria, 238 

 Williams and Lowden's method of 



staining Negri bodies, 368 

 Winslow's method of counting bacteria, 



238 

 Wires, platinum, for bacteriologic use, 



202 

 Wolfhiigel apparatus for counting col- 

 onies of bacteria on plates, 237 

 Wooden apparatus, sterilization of, 169 



tongue, 732 

 Wool-sorters' disease, 358 

 Wounds, disinfection of, 175 



tubercle bacillus, infection through, 

 671 

 Wright's blood-stain for protozoa, 163 

 method of counting bacteria in sus- 

 pension, 238 

 of making anaerobic cultures, 218, 

 220 

 Wiirtz and Kashida's method of culti- 

 vation of Bacillus typhosus, 606 



Xenopsylla cheopis, 552, 554, 561,562 

 Xerosis, bacillus of, 431 

 X-rays, influences on growth of bac- 

 teria, 53 



Y BACILLUS, 648 



Yaws, 729. See also Frambesia 



tropica 

 Yeasts, 38 

 Yellow fever, 536 



mosquitoes and, 537 

 prophylaxis, 539 

 rules for prevention, 538 

 Young's method of cultivation of 

 Micrococcus gonorrhcese, 395 



Zenker's fluid, 149 

 Ziehl's method of staining Bacillus 

 typhosus, 590 

 tubercle bacillus, 661 

 Zieler's method of staining, 155 

 Zinsser's method of making' anaerobic 



cultures, 218 

 Zopf's Bacterium pneumonia-, 457 

 Zur Nedden's bacillus, 409 

 Zygospores, 41 

 Zygote, 477 

 Zymogens, 57 



