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AN example of the growth of coliform bacilli in water containing organic material was recorded by Houston in 1916. The water from a tap on a pressure main in the Metropolitan Water Board's works gave very unsatisfactory bacterial counts, the cause of which was eventually traced to a leather washer. The " leather bacillus " which was isolated from the washer was indistinguishable from B. capszclatus and B. bctis acerogenes except for the production of indole. These two organisms increased in numbers when seeded into bottles containing sterile water and a " susceptible " leather washer. Schobl and Ramirez (1925) reported upon 23 wells in Manila which were delivering water with large numbers of coliform

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