A virulent bacteriophage was isolated from lysates of Bacillus stearothermophilus strain NU-10 induced either by treatment with mitomycin C or by shifts in temperature. Optimum conditions for induction, morphology and other properties of the virus are described. Chloroform treatment and shifts in temperature of producer cells released approximately similar amounts of phage as did mitomycin induction, suggesting an effect on release rather than on synthesis of the virus.
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