Subject Index. 



257 



Sewage, bacteriological examina- 

 tion of, i86. 



bacteriology of, 184. 



determination of B. coli in, 187. 



disposal, object of, 184. 



diurnal variation in bacterial 

 content of, 189. 



effluents, bacteriology of, 184. 



number of bacteria in, 188. 



sterilization of, 196, 197. 



streptococci, 152. 



streptococci, agar streak of, 

 100. 



streptococci, overgrowth by, 91. 

 Shellfish, 185. 

 Significance of B. coli, 112. 

 Snow, bacteria in, 6. 

 Soil, effect of depth on number of 



bacteria, 22. 

 Soil, removal of bacteria by, 22. 

 Springs, bacteria in, 24. 

 Spring waters, bacteria in, 23. 

 Standard methods, 28. 



importance of, 40, 



methods, procedure, 97. 



methods, test for B. coli, 103. 



procedure, 66. 

 Standards, arbitrary 46, 47. 

 Standing water, bacteria in, 10. 

 Staphylococci, 153. 

 Storage, effect of, 10, 11. 

 Streptococci, 99. 



agar streak of, 100. 



and B. coli, detection of, 158. 



and B. coli, relation to sewage 

 pollution, 158. 



and B. coli, relative growth of, 

 in dextrose broth, 156, 157. 



as index of pollution, 153. 



fermenting power, 160. 



Streptococci — Continued 



from intestinal tract, 160. 



in polluted rivers, 153, 



isolation of, 155. 



significance of, 175. 

 Streptococcus pyogenes, 152. 

 Subsidence of bacteria, 14. 

 Sugar broths, 207. 

 Sugar agar, 209. 

 Sunlight, bactericidal action of, 17 



18. 

 Sunlight, effect of, 17, r8. 

 Surface pollution, effect on num- 

 ber of bacteria, 9, 10. 



wash, 7. 

 Surface water, 7. 



waters, B. coli in, 130. 



Temperature, effect of, 14. 

 effect on colon bacilli, 17. 

 effect on presumptive test, 



I4S- 

 relation to bacterial life, 17. 



Thames River, B. coli in, I3r. 



Thermophilic bacteria, 185. 



Time, effect of, on self-purifica- 

 tion, 2r. 



Time, effect on sample, 36. 



Toronto water supply, increase of 

 bacteria in, 55. 



Total count, 57. 



Toxic products, effect of, 16. 



Trickling filters, 192. 



Tubular wells, 23. 



Typhoid bacilli, direct isolation of, 

 69._ 

 badlli, effect of dissociated 



hydrogen on, 19. 

 bacilli, effect of other organisms 

 on viability of, 16. 



