For, setting aside the artistic prejudices which would have led the Greeks to reject this idea of unlimited improvement, we may note that the modern conception of progress rests partly on the new enthusiasm and worship of humanity, partly on the splendid hopes of material improvements in civilisation which applied science has held out to us, two influences from which ancient Greek thought seems to have been strangely free. For the Greeks marred the perfect humanism of the great men whom they worshipped, by imputing to them divinity and its supernatural powers; while their science was eminently speculative and often almost mystic in its character, aiming at culture and not utility, at higher spirituality and more intense reverence for law, rather than at the increased facilities of locomotion and the cheap production of common things about which our modern scientific school ceases not to boast. And lastly, and perhaps chiefly, we must remember that the 'plague spot of all Greek states,' as one of their own writers has called it, was the terrible insecurity to life and property which resulted from the factions and revolutions which ceased not to trouble Greece at all times, raising a spirit of fanaticism such as religion raised in the middle ages of Europe.

These considerations, then, will enable us to understand first how it was that, radical and unscrupulous reformers as the Greek political theorists were, yet, their end once attained, no modern conservatives raised such outcry against the slightest innovation. Even acknowledged improvements in such things as the games of children or the modes of music were regarded by them with feelings of extreme apprehension as the herald of the DRAPEAU ROUGE of reform. And secondly, it will show us how it was that Polybius found his ideal in the commonwealth of Rome, and Aristotle, like Mr. Bright, in the middle classes. Polybius, however, is not content merely with pointing out his ideal state, but enters at considerable length into the question of those general laws whose consideration forms the chief essential of the philosophy of history.

He starts by accepting the general principle that all things are fated to decay (which I noticed in the case of Plato), and that 'as iron produces rust and as wood breeds the animals that destroy it, so every state has in it the seeds of its own corruption.' He is not, however, content to rest there, but proceeds to deal with the more immediate causes of revolutions, which he says are twofold in nature, either external or internal. Now, the former, depending as they do on the synchronous conjunction of other events outside the sphere of scientific estimation, are from their very character incalculable; but the latter, though assuming many forms, always result from the over-great preponderance of any single element to the detriment of the others, the rational law lying at the base of all varieties of political changes being that stability can result only from the statical equilibrium produced by the counteraction of opposing parts, since the more simple a constitution is the more it is insecure. Plato had pointed out before how the extreme liberty of a democracy always resulted in despotism, but Polybius analyses the law and shows the scientific principles on which it rests.

The doctrine of the instability of pure constitutions forms an important era in the philosophy of history.