1. The metabolism of cisand trans-acenaphthene-1,2-diol has been studied after the administration of these compounds to rats by subcutaneous injection and by stomach tube. 2. 1,8-Naphthalic acid has been isolated as its anhydride from the urine of the dosed animals. 3. A spectrophotometric method for the determination of free and conjugated 1,8-naphthalic acid in urine has been developed and ha...