SUMMARY: By the use of seven phage preparations, forty-one of fifty smooth strains of were classified into eleven types. The remaining nine strains were insusceptible to all the test phages; mouse passage did not render them susceptible. Acquired phage resistance was responsible for many of the strains being regarded as different phage types. A study of phage-resistant variants cast doubt on the complete validity of Bail's cross-resistance tests. The danger of using lysogenie cultures for the propagation of phages for the study of phage mutation were noted. Most of the phages were fully active against strains of but not for other sp. that were tested.


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