INDEX 



605 



Virulence, attenuation of, 459 

 exaltation of, 461 

 of bacteria, 150 



Water, bacteria in, 135 



contamination of by sewage, 138 

 examination of, 135 

 supplies, typhoid bacilli in, 345 

 Weichselbaum on pneumonia, 198 

 Weigert's method of dehydration, 93 

 modification of Gram's method, 100 

 Wertheim's medium, 220, 226 

 Whooping cough, bacteria in, 423 

 Widal on serum diagnosis, 485 

 Widal's reaction, synonym for agglu- 

 tination of b. typhosus, q.v., 

 109, 337 

 Winogradski, 23 

 Winter-spring fevers, 529 

 Wolff and Israel's streptothrix, 295 

 Woodhead on tuberculosis, 257 

 Woody tongue, 292 

 Woolsorter's disease, 311 

 Wright's, A. E., calibrated pipette, 



108 



diluting pipette, 66 

 method of counting dead 

 bacteria, 67 



Wright's, A. E., opsonic technique, 



112 

 vaccination against tuberculosis, 



261 

 vaccination treatment of pyo- 



genic infections, 194 

 Wright, J. H., on anaerobic strepto- 



thrices, 293 

 Romanowsky stain, 107 



Xerosis bacillus, 367 

 Xylol, 93 



Yaws, spirochaetes in, 234 

 Yellow fever, 451 



bacteria in, 452 



etiology of, 452 



mosquitoes in relation to, 453 

 Yersin (v. also Roux), on plague, 



435 et seq. 

 Yersin's anti-plague serum, 436 



Ziemanni, spirillum, 550 

 Ziehl-Neelsen stain, 101 

 Zoogloea, 3 

 Zygote (malaria), 328 



