Abstract
The rat is able to synthesize p-iodophenylmercapturic acid from iodobenzen; is unable to oxidize that mercap-turic acid to ethereal sulphate; and does not develop hemoglobinuria after the administration of that mer-capturic acid. The rabbit is unable to oxidize p-iodophenylmercapturic acid to ethereal sulphate. It does not develop hemoglobinuria after the administration of that mercapturic acid. It converts a very small fraction of injected iodobenzene into p-iodophenylmercapturic acid.