SUBJECT INDEX. 1 59 



PAGE 



Quantitative analysis, period of incubation 31 



, plating 28-29 



, procedure for 21 



, recording results 33 



, sampling 21-24 



, storage of samples 25 



bacteriological analysis, significance of Ill 



Rabbits, B. coli in 74, 75 



Rain, bacteria in 8, 47 



, contamination of surface water by 9 



Reaction of media 29 



Recording quantitative results 33 



Red colonies in litmus lactose agar 66 



Relation of B. coli to B. acidi lactici 80 



Rellingen, typhoid bacillus in well at 53 



Saccharose broth, preparation of. 122 



Salem tap-water, bacteria in 10, 47 



Sample bottles, cleaning of 22 



, handling 22 



, size of, effect of, upon multiplication of bacteria. ... 27 



, sterilization of 22 



Sampling, for bacteriological analysis 21-25 



, necessity for care in 37 



Sand nitration 40 



Sangamon River, B. coli in 90 



Sanitary inspection 109 



Research Laboratory, bacteria in Boston sewage 45 



Sea-water, bacteria in 10 



Seasonal distribution of bacteria in surface waters 9 



variation of bacterial content in surface waters 9, 38 



Sedimentation of bacteria n 



Seine, bacteria in 39 



Self-purification of lakes and ponds 10 



of streams 8, 13, 39, 113 



Severn River, colon bacilli in 45, 85 



Sewage, B. coli in 89 



, bacteria in 45 



, distribution of, in water 116, 117 



pollution, bacteria in relation to 39 



