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The mutagenic action of certain organic peroxides was first shown in work of Wyss, Stone, et al.1 in 1947-1948 on Micrococcus pyogenes (Staphylococcus aureus) and, soon afterward, in work of Dickey, Cleland, and Lotz2 in 1948 on Neurospora crassa. Because of the importance of peroxides in the production of mutations in microorganisms and as intermediates in the production of mutations by ultraviolet

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HE effectiveness of long ultraviolet and visible light (photoreactivating light)T in reducing the number of mutations produced by mutagenic ultraviolet, when the light is applied as a posttreatment, has been demonstrated in a number of microorganisms (

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