316 



SUBJECT INDEX 



Pathogenes in water, 74. 



Pathogenic bacteria, 74. 



Peptone, importance of, 44. 



Petri dishes, 105. 



Phenol agar, 105. 



Phenol broth, 119. 



Phenol dextrose broth, 108. 



Plate method, 105. 



Plating, 40. 



Polluted shellfish, effect of cook- 

 ery on, 248. 



Polluted waters, isolation of B. 

 coli from, 107. 



Pollution, progressive, 223. 

 of shellfish, 245. 

 temporary, 225. 



Porous tops, 64, 105. 



Precipitation of typhoid bacilli, 

 81, 83, 84. 



Preliminary enrichment, 106. 



Presumptive test, no. 



Presumptive tests, various, 126. 



Presumptive tests with bile media, 

 124. 



Progressive pollution, detection 

 of, 223, 



Prototrophic bacteria, 29. 



Protozoa, reduction of bacteria 



by, 15- 



Pumping, effect of on bacteria, 35. 



Quantitative bacteriological de- 

 termination, 29. 

 interpretation of, 51. 



Quantitative results, expression 

 of, 49. 



Rainfall, effect of on bacteria, 7. 

 Reaction, importance of, 43. 

 Reaction of culture media, 267. 

 Reaction, optimum, 43. 



Reducing bacteria, importance of, 

 242. 



Relation between room tempera- 

 ture and body temperature 

 counts, 61, 67, 71. 



Room temperature counts, 61. 



Saccharose, fermentation of, 180. 

 Samples, dilution of, 40. 

 Samples, icing of, 39. 

 Sampling, 33. 

 Sand filtration, 57. 

 Sanitary chemical analysis, sig- 

 nificance of, 216. 

 Sanitary inspection, 215. 

 importance of, 172. 

 Seasonal variation, 72. 

 Sedimentation, 7. 

 Sedimentation of bacteria, 14. 

 Self-purification, 20. 

 Selective media, 219. 

 Selective temperatures, 219. 

 Sewage, bacteria in, 214. 

 bacteriology of, 228. 

 colon bacilli in, 231. 

 Sewage eflfluents, bacteriology of, 

 228. 

 colon bacilli in, 231. 

 standards for, 239. 

 Sewage examination, use of bile 



medium in, 231. 

 Sewage sampling, error of, 231. 

 streptococci, 134, 201. 

 as index of pollution, 202. 

 isolation of, 204. 

 Sewage streptococci and B. coH, 

 growth in dextrose broth, 205, 

 206. 

 detection of, 206. 

 Sewage and sewage elHuents, 228, 



229. 

 Shallow wells, bacteria in, 36. 



