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Following 8 CER training days, 18 rats were given second-order conditioning trials under one of two conditions. Control Ss had the response lever present during all 10 SOC days. Experimental Ss had the lever absent during the first 3 SOC days (CS, was noise, CS, was a flashing light). A second experiment with 16 rats reversed the first-and second-order stimuli and gave 5 days of SOC with the lever absent for half the Ss. In both studies, when the lever was returned for all Ss, subsequent SOC days showed no significant differences between groups with respect to either acquisition of SOC or extinction of FOC. These results offer no support to Kamil 's (1969) hypothesis that his failure to find a correspondence between first-and second-order conditioned suppression might be due to counterconditioning of CS, to the food reinforcement obtained during SOC.