On the Varieties ofBacillus Coliassociated with the House-fly (Musca Domestica)

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Abstract
1. A study of the natural bacterial flora of the house-fly appears to be essential in forming a correct estimate of the part played by flies in transmitting pathogenic bacteria.2. The house-fly may carry at least 27 varieties ofBacillus coli, by far the most frequent of which areB. coli communisand MacConkey's bacillus No. 71.3. As far as can be judged from the character of these colon bacilli the house-fly derives its bacterial flora equally from excremental matter and from other sources.4. Certain non-lactose fermenting bacilli appear to be capable of multiplying in the intestine of the house-fly. Of these Morgan's bacillus No. 1 is a not infrequent inhabitant of the fly's intestine andB. paratyphosus βhas been found on two occasions.