How far Aristotle was justified in regarding the family as the ultimate unit, with the materials afforded to him by Greek literature, I have already noticed. Besides, Aristotle, I may remark, had he reflected on the meaning of that Athenian law which, while prohibiting marriage with a uterine sister, permitted it with a sister-german, or on the common tradition in Athens that before the time of Cecrops children bore their mothers’ names, or on some of the Spartan regulations, could hardly have failed to see the universality of kinsmanship through women in early days, and the late appearance of monandry. Yet, while he missed this point, in common, it must be acknowledged, with many modern writers, such as Sir Henry Maine, it is essentially as an explorer of inductive instances that we recognise his improvement on Plato. The treatise _περὶ πολιτείων_, did it remain to us in its entirety, would have been one of the most valuable landmarks in the progress of historical criticism, and the first scientific treatise on the science of comparative politics. A few fragments still remain to us, in one of which we find Aristotle appealing to the authority of an ancient inscription on the ‘Disk of Iphitus,’ one of the most celebrated Greek antiquities, to corroborate his theory of the Lycurgean revival of the Olympian festival; while his enormous research is evinced in the elaborate explanation he gives of the historical origin of proverbs such as _οὐδεῖς μέγας κακὸς ἰχθῦς_, of religious songs like the _ἰῶμεν ἐς Ἀθήνας_ of the Botticean virgins, or the praises of love and war. And, finally, it is to be observed how much wider than Plato’s his theory of the origin of society is. They both rest on a psychological basis, but Aristotle’s recognition of the capacity for progress and the tendency towards a higher life shows how much deeper his knowledge of human nature was. In imitation of these two philosophers, Polybius gives an account of the origin of society in the opening to his philosophy of history. Somewhat in the spirit of Plato, he imagines that after one of the cyclic deluges which sweep off mankind at stated periods and annihilate all pre-existing civilisation, the few surviving members of humanity coalesce for mutual protection, and, as in the case with ordinary animals, the one most remarkable for physical strength is elected king. In a short time, owing to the workings of sympathy and the desire of approbation, the moral qualities begin to make their appearance, and intellectual instead of bodily excellence becomes the qualification for sovereignty. Other points, as the rise of law and the like, are dwelt on in a somewhat modern spirit, and although Polybius seems not to have employed the inductive method of research in this question, or rather, I should say, of the hierarchical order of the rational progress of ideas in life, he is not far removed from what the laborious investigations of modern travellers have given us.