340 



INDEX 



Trichobacterinae (higher bacteria), sub- 

 orders of, 1 09-1 1 1. 



Trophotropism, 141. 



Tuberculosis, distribution of, by bac- 

 teria in the air, 291-292 ; among 

 dairy cattle, 314-315. 



"Tyndallization," 80-81. 



Typhoid epidemics, 296-298; due to 

 milk, 316-317. 



Vaccines, 267. 



Vegetable kingdom, classification of 



bacteria in, 115-116. 

 Vegetables as culture media, 7172. 

 Vegetative forms of bacteria, 46-50. 

 Vinegar, acetic acid fermentation in 



manufacture of, 209. 

 Virulence, property of, 267-268. 



W 



Walls of bacterial cells, 52-53 ; chemi- 

 cal composition of, 63-64. 



Water, requisite for growth of bacteria, 

 129-131; germicidal action of sun- 



light on, 157-158; effect of motion 

 of, on bacteria, 1 63 ; bacterial pig- 

 ments soluble in, 194-195 ; pig- 

 ments insoluble in, 195-196; preva- 

 lence of bacteria in, 293-294 ; origin 

 of bacteria in, 294-295; species of 

 bacteria in, 295-298. 



Water analysis, bacteriological, 299- 

 301. 



Weight of average bacterium, 29. 



Will-o'-the-wisp phenomenon, 198-199. 



Wine, aid of acetic acid bacteria in mak- 

 ing, 209. 



Yeasts, relationship of, to bacteria, 

 121-122; concerned in fermentive 

 processes, 206. 



Zeit, quoted on effect of electricity on 



bacteria, 160-162. 



Ziehl's carbol fuchsin for staining, 97. 

 Zooglcea, formation of, 35-36, 37 ff . 

 Zymogenic bacteria, 202-215. 



