SUMMARY: One hundred and eighty-three strains of were examined for lysogeny and colicinogeny: 40.4 % were neither lysogenic nor colicinogenic; 31.1 % were only colicinogenic; 13.1% were only lysogenic; 15.2% were lysogenic and colicinogenic. Though the detection of lysogeny could almost certainly be increased by using a greater number of sensitive indicator strains or by using more sensitive methods, the results of this study suggest: () that lysogeny in is more frequent than found in earlier studies (Fredericq, 1952); () that lysogeny and colicinogeny are not correlated but occur independently in strains.


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