He makes him ask Alcibiades whether it is “in the class of nobles or in the class of plebeians that natural superiority is to be found;” to which the proficient pupil unhesitating makes answer, “Undoubtedly, in the class of nobles,” or “in those nobly born.” Aristotle is still more emphatic than Plato in laying down the theory of human inequality. In one place he goes so far as to call children “the animated tools of their parents,” signifying by that, that children are by birth the natural slaves of their fathers. In his “Treatise on Politics,” he tells us, roundly, that at the very moment of their birth all created beings are naturally fashioned, some to obey, and some to command--or, rather, some _to be commanded_, and the others to command; for it is the same verb he makes use of in both cases, using the _passive_ mood for the slaves and the _active_ for the slave-owners. In the same treatise he tells us, further on, that nature actually makes the bodies of freemen (genteel folk) different from those of slaves; that the latter are purposely made robust and hardy for the necessities of labour, whilst those of gentlemen are made so slight and upright as to be unfit for physical labour, but well qualified for the business of government. In citing this passage, we have given an almost literal translation of the Greek--a translation more expressive of the author’s sense than a strictly verbal translation would be. The very terms made use of by Aristotle show clearly his belief that slaves were made to be slaves, and their masters to govern them. The words we have rendered by the free translation, “qualified for the business of government,” mean, “_literally_, availably useful for political life,” which, if not so intelligible, is stronger and of wider signification than our translation. At all events, there can be no doubt as to Aristotle’s meaning. Like Homer and Plato, he was a firm believer in the _duality_ of human nature--that is to say, that slaves were born with one nature, and their masters with another. Indeed, Plato carried this creed so far, that he made slavery to consist in the moral and mental man himself, and not in the servility of his condition as a slave. A wise man, he contended, could not be made a slave of: the natural superiority of such a man would rise superior to any, or all, conditions that might be imposed upon him. Plato lived to have his doctrine tried in his own person. Dionysius, the tyrant of Sicily, had him sold for a slave by one Pollio, a Lacedemonian chief; but history does not say whether Plato the slave held the same opinions on slavery as Plato the freeman and philosopher. It was one of his maxims that “a wise and just man could be as happy in a state of slavery as in a state of freedom.” Dionysius took him at his word, and, tyrant though he was, we think he served Plato right. The sage who believed in two natures, one for slaves and another for freemen, and who taught that a