And indeed it is apparent at first sight that the Platonic succession of states represents rather the succession of ideas in the philosophic mind than any historical succession of time. Aristotle meets the whole simply by an appeal to facts. If the theory of the periodic decay of all created things, he urges, be scientific, it must be universal, and so true of all the other states as well as of the ideal. Besides, a state usually changes into its contrary and not to the form next to it; so the ideal state would not change into Timocracy; while Oligarchy, more often than Tyranny, succeeds Democracy. Plato, besides, says nothing of what a Tyranny would change to. According to the cycle theory it ought to pass into the ideal state again, but as a fact one Tyranny is changed into another as at Sicyon, or into a Democracy as at Syracuse, or into an Aristocracy as at Carthage. The example of Sicily, too, shows that an Oligarchy is often followed by a Tyranny, as at Leontini and Gela. Besides, it is absurd to represent greed as the chief motive of decay, or to talk of avarice as the root of Oligarchy, when in nearly all true oligarchies money-making is forbidden by law. And finally the Platonic theory neglects the different kinds of democracies and of tyrannies. Now nothing can be more important than this passage in Aristotle's Politics (v. 12.), which may be said to mark an era in the evolution of historical criticism. For there is nothing on which Aristotle insists so strongly as that the generalisations from facts ought to be added to the data of the a priori method--a principle which we know to be true not merely of deductive speculative politics but of physics also: for are not the residual phenomena of chemists a valuable source of improvement in theory? His own method is essentially historical though by no means empirical. On the contrary, this far-seeing thinker, rightly styled il maestro di color che sanno, may be said to have apprehended clearly that the true method is neither exclusively empirical nor exclusively speculative, but rather a union of both in the process called Analysis or the Interpretation of Facts, which has been defined as the application to facts of such general conceptions as may fix the important characteristics of the phenomena, and present them permanently in their true relations. He too was the first to point out, what even in our own day is incompletely appreciated, that nature, including the development of man, is not full of incoherent episodes like a bad tragedy, that inconsistency and anomaly are as impossible in the moral as they are in the physical world, and that where the superficial observer thinks he sees a revolution the philosophical critic discerns merely the gradual and rational evolution of the inevitable results of certain antecedents.