FORE:In the world of thought no less than in the world of action, the boundless license which characterised the last days of Roman republicanism was followed by a period of tranquillity and restraint. Augustus endeavoured to associate his system of imperialism with a revival of religious authority. By his orders a great number of ruinous temples were restored, and the old ceremonies were celebrated once more with all their former pomp. His efforts in this direction were ably seconded by the greatest poet and the greatest historian of the age. Both Virgil and Livy were animated by a warm religious feeling, associated, at least in the case of the latter, with a credulity which knew no bounds. With both, religion took an antiquarian form. They were convinced that Rome had grown great through faith in the gods, that she had a divine mandate to conquer the world, and that this supernatural mission might be most clearly perceived in the circumstances of her first origin.307 It is also characteristic that both should have been provincials, educated in the traditions of a201 reverent conservatism, and sympathising chiefly with those elements in the constitution of Rome which brought her nearest to primitive Italian habits and ideas. Now it was not merely the policy, it was the inevitable consequence of imperialism to favour the provinces308 at the expense of the capital, by depriving the urban population and the senatorial aristocracy of the political preponderance which they had formerly enjoyed. Here, as in most other instances, what we call a reaction did not mean a change in the opinions or sentiments of any particular persons or classes, but the advent of a new class whose ways of thinking now determined the general tone of the public mind.To understand Descartes aright, we must provisionally disregard the account given in his work on Method of the process by which he arrived at a new theory of the world; for, in truth, there was nothing new about it except the pro388portion in which fragments taken from older systems were selected and recombined. As we have already noticed, there is no such thing as spinning philosophies out of ones own head; and, in the case of Descartes, even the belief that he was so doing came to him from Plato; for, along with Aristotles dogmatic errors, his sound teaching with regard to the derivation of knowledge had fallen into oblivion. The initial doubt of the Discourse on Method and the Meditations is also Platonic; only it is manifested under an individual and subjective, instead of a universal and objective form. But to find the real starting-point of Descartes enquiries we must look for it in his mathematical studies. A geometrician naturally conceives the visible world under the aspect of figured extension; and if he thinks the figures away, nothing will remain but extension as the ultimate material out of which all determinate bodies are shaped. Such was the result reached by Plato in his Timaeus. He identified matter with space, viewing this as the receptacle for his eternal and self-existent Ideas, or rather the plastic medium on which their images are impressed. The simplest spatial elements are triangles; accordingly it is with these that he constructs his solid bodies. The theory of triangular elements was probably suggested by Atomism; it is, in fact, a compromise between the purely mathematical and the materialistic methods. Like all Platos fancies, this theory of matter was attacked with such convincing arguments by Aristotle that, so long as his physics remained in the ascendent, it did not find a single supporter; although, as we saw in the last chapter, Plotinus very nearly worked his way back to it from the Peripatetic definition. Even now, at the moment of Aristotles fall, it might have failed to attract attention, had not the conditions under which it first arose been almost exactly repeated. Geometrical demonstration had again become the type of all reasoning; there was again a sceptical spirit abroad, forcing men to fall back on the most elementary and universal con389ceptions; an atomistic materialism again threatened to claim at least the whole field of physical enquiry for its own. That Descartes followed the Timaeus in identifying matter with extension cannot be doubted; especially when we see that he adopts Platos analysis of body into elementary triangles; but the theory agreed so well with his intellectual predispositions that he may easily have imagined it to be a necessary deduction from his own priori ideas. Moreover, after the first two steps, he parts company with Plato, and gives himself up, so far as his rejection of a vacuum will permit, to the mechanical physics of Democritus. Much praise has recently been bestowed on his attempt to interpret all physical phenomena in terms of matter and motion, and to deduce them from the unaided operation of natural causes; but this is no more than had been done by the early Greek thinkers, from whom, we may observe, his hypothesis of an initial vortex was also derived. His cosmogony is better than theirs, only in so far as it is adapted to scientific discoveries in astronomy and physiology not made by Descartes himself; for where his conjectures go beyond these they are entirely at fault.
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