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1. Styrene epoxide formation and styrene epoxide hydration have been studied in liver, lung, kidney, heart, spleen and brain of female and male rats. 2. Styrene epoxide formation is NADPH-dependent although it is enhanced when NADH is added together with NADP. This enzymic activity is inhibited by metyrapone and SKF 525-A but not by the effective inhibitors of epoxide hydrase, 1,2-epoxy-3,3,3-trichloropropene and cyclohexene oxide. 3. Known inducers of liver microsomal mono-oxygenases show a different activity on the two enzymes. Phenobarbital increases both formation and hydration of styrene epoxide; and carbamazepine increase the hydration but not the formation of styrene epoxide; a steroid contraceptive combination (lynestrenol+ mestranol) increases styrene epoxide formation while it inhibits epoxide hydrase; 3-methylcholanthrene does not affect either of the activities.