SUBJECT INDEX 



315 



Incubation period, 41, 47. 



for body temperature count, 



64. 

 Incubator, necessity for moisture 



in, 46. 



Indol test, 176. 

 Infusoria, destruction of bacteria 



by, 15- 



Interpretation of results, 51. 

 Intestinal bacilli, 103, 201. 

 Isolation of B. coli, 104, 132. 



by bile media, 122. 

 Isolation of cholera spirillum, 97. 

 Isolation of streptococci, 203. 



Lactose bile, 81, 122, 126. 

 action of bacteria on, 102. 

 advantage of, 127. 

 decomposition of, 64. 



comparison with dextrose 



broth, 125. 



preparation of, 269. 

 Lactose fermentation, 114. 



importance of, 115. 

 Lactose fermenting bacilli, 102. 



effect of storage on, 115. 

 " Lamirascsal," streptococci, 210. 

 " Larasacsal " streptococci, 210. 

 Light, destructive effect on bac- 

 teria, 16, 17. 

 Litmus lactose agar, 64, 104. 



counts, 65. 



incubation of, 132. 



preparation of, 272. 

 Liver agar, preparation of, 274. 



broth, 131. 



preparation of, 273. 

 Liver gelatin, preparation of, 274. 



Malachite green agar, 77. 

 McConkey's group in filtered 

 water, 198. 



McConkey's groups in raw waters, 



198. 

 McConkey's groups in stored 



waters, 198. 



Mechanical filtration, 57. 

 Methods of estimation, 48. 

 Middletown outbreak, 245. 

 Milk, preparation of, 278. 

 Mussels, 244. 

 Mutations in B. coli, 183. 



Nahrstoff agar, ratio, 31. 

 Nahrstoff gelatin, ratio, 31. 

 Nahrstoff-Heyden agar, 29. 

 Neutral red, 122. 

 Neutral red reaction, 121. 

 Neutral red test, 178. 

 Nitrate broth, preparation of, 287. 

 Nitrates, 3. 

 Nitrite test, 177. 

 Nitrogen cycle, 4. 

 Nitroso-indol reaction, 97. 

 Nutrient broth, preparation of, 



268. 

 Nutrose, 76. 



Obligate parasites, 29. 

 Overgrowth, effect of, 119. 

 Oysters, 244. 



B. coli in, 259. 



bacterial counts of, 258. 



bacteriological examination of, 



257- 



opened, examination of, 262. 

 rating for B. coli, 260. 

 sampling, 257. 

 Oysters and typhoid, 246. 



Para-colon bacilli, 187. 

 Para- typhoid bacilli, 94. 



