Abstract
EIGHTY-SIX strains of Alcaligenes faecalis were investigated. Five of these were N.C.T.C. cultures. The remaining strains were isolated from faeces and correspond to the description in Bergey's Manual of Determinative Bacteriology1. Media adopted were those previously2 used. Lysogeny was investigated by growing organisms singly and in mixtures in broth for 10 days and by ultra-violet induction. These methods have been described2. Thirty of the organisms proved lysogenic for one or more of the 86 strains. Thirteen strains were inducible by ultra-violet light. Moore and Pickett3 investigated 40 strains of A. faecalis-like organisms and found 3 of them to be lysogenic for other members of the group.
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