Some of the Papers Presented to the Laboratory Section of the Association At ...
Some of the Papers Presented to the Laboratory Section of the Association At ...
American Public Health Association
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WiNSLOw The average results of the analyses of sewage are presented in Table 8 with the ratio which the count on each medium bears to the count on lactose gelatin at 20°. TABLE 8. Bacteria in Boston Sewage. SERIES A. Bacteria pes c.c. No. OF Samples On Lactose Gelatin at 20' On Lactose Agar at87* On Liquefiers Acid Formers Total Acid Formers Total Anafirobic A«ar 56 Ratio to Gelatin Count 365,000 7 1,670,000 31 5,430,000 100 1,670,000 31 3,760,000 69 2,440,000 45 SEBIES B. Bacteria per c.c. No.... OF Samples Microscopic Ck>unt Lactose Gelatin at 20* Lactose Agar at 37' N&hrstoff Anae- Liquefiers Acid Formers Total robic Gelatin 25 Ratio to Gelatin Count. . 29,000,000 1700 149,000 9 429,000 25 1,690,000 100 1,400,000 83 2,930,000 170 850,000 50 The total number of bacteria on lactose gelatin was three times as great in Series A as in Series B ; this is due to the fact that the first series included the autumn months in which the number of bacteria in sewage reaches a maximum. In Table 9, the monthly values obtained in the first set of experiments show clearly this autumnal maximum which is also manifest in the Lawrence and Ames results of Table 1.
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