SUMMARY Infection of by phage λ in 0.02M-Sr(NO), CaCl or MnSO occurred as readily as in 0.02M-MgSO. The response of bacteria infected in the presence of Sr, Ca and Mg was predominantly lysogenic, but infection in 0.02 M-Mg gave a higher lysogenic response (90%) than with the other cations tested. With Mn in optimal conditions, at least 25% of the infected bacteria always gave the lytic response. When the newly infected bacteria were transferred to a growth medium, a period of about 40 min. had to elapse before the prophage could be detected by zygotic induction by mating with a non-lysogenic organism. A period of about 100 min. was required before all the bacteria giving the lysogenic response could be induced by ultraviolet radiation.


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