SUBJECT INDEX. 155 



PAGE 



Isolation of B. coli, examination of subcultures 71 



, from large samples 63, 64, 65 



, growth on agar streak 67 



, Mass. Inst Tech. record blank 69 



, Mass. State Board of Health methods 69 



, necessity of standard methods 69 



, percentage of cultures passing various tests 72 



; period of preliminary enrichment 62 



, phenol broth method 62 



, preliminary enrichment 61 



, separation of pure cultures 65 



, significance of large samples 87, 91 



, significance of quantitative results 8i 



, variations in cultural reactions 73 



streptococci 102 



Jewell filter, bacterial efficiency 41 



Kiel, bacteria in wells at 15, 16 



Lactic acid bacteria 79 



Lactose-agar plate as a presumptive test 97 



plates 44 



, use in isolation of B. coli 60, 65 



; preparation of 122 



broth, preparation of. 122 



, fermentation of, by B. coli 58, 59 



-fermenting bacteria in polluted waters 48 



-fermenting organisms in normal water 48 



Lake Champlain, bacteria in 10 



of Lucerne, bacteria in 10 



Zurich, bacteria in 38 



Lakes, bacteria in 10 



Lawrence city filter, bacterial efficiency of 40, 87 



Leitmeritz, bacteria in wells at 15 



Light, effect of, upon bacteria 11, 13 



in streams 13 



Liquefying bacteria 108 



, phenolated, for B. coli isolation 60 



Litmus lactose agar plate, incubation of 66 



plate, isolation of B, coli by 59 



