SUMMARY: In twelve strains, comprising three species of saprophytic and two of , a life cycle was observed in which small gonidia, resembling very tiny bacteria, sometimes motile by means of polar flagella, were formed within enlarged mother-cells. After a period of reproduction in this phase, the gonidia became progressively enlarged to reconstitute the original form. In one species of , the cycle was induced by the addition of penicillin to the medium, and in this and certain other respects was reminiscent of the L-cycle.


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