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1. Of 585 strains of lactose-fermenting aerobes each isolated from faeces of a different person, 501 did not utilise citrate or ferment cellobiose; 20 were citrate negative and cellobiose positive; 27 were cellobiose negative and citrate positive; and 37 were positive to both tests.  2. Almost 10 per cent, of the strains isolated were indol negative.  3. One culture was methyl-red negative and Voges-Proskauer positive. Two were positive to both tests. The rest were methyl-red positive and Voges-Proskauer negative.  4. It is concluded that the results are not favourable to the use of the citrate or the cellobiose test in routine water analysis.  5. A discussion of the taxonomy of the lactose-fermenting aerobes is given. Only two species, Bacterium coli (Escherich) L. and N., and Bacterium aerogenes (Escherich) Chester, are recognised.

The Utilisation of Citrates and the Fermentation of Cellobiose by Strains ofBacterium ColiIsolated from Human Faeces