Books, of which the principles are diseased or deformed, must be kept on the shelf of the scholar, as the man of science preserves monsters in glasses. They belong to the study of the mind's morbid anatomy, and ought to be accurately labelled. Voltaire will still be a wit, notwithstanding he is a scoffer; and we may admire the brilliant spots and eyes of the viper, if we acknowledge its venom and call it a reptile.