THREE:Meanwhile the old principle of universal doubt could no longer be maintained in presence of the certainties already won by modern science. Man, in the time of Newton, had, as Pope tersely puts it, too much knowledge for the sceptic side. The problem was not how to establish the reality, but how to ascertain the origin and possible extent of that knowledge. The first to perceive this, the first to evolve criticism out of scepticism, and therefore the real founder of modern philosophy, was Locke. Nevertheless, even with him, the advantage of studying the more recent in close connexion with the earlier developments of thought does not cease; it only enters on a new phase. If he cannot, like his predecessors, be directly affiliated to one or more of the Greek schools, his position can be illustrated by a parallel derived from the history of those schools. What Arcesilaus and Carneades had been to Socrates and his successors, that Locke was, in a large measure, to Bacon and the Cartesians. He went back to the initial doubt which with them had been overborne by the dogmatic reaction, and insisted on making it a reality. The spirit of the Apologia is absent from Platos later dialogues, only to reappear with even more than its original power in the teaching of the New Academy. And, in like manner, Descartes introspective method, with its demand for clear ideas, becomes, in the Essay concerning Human Understanding, an irresistible solvent for 420the psychologyy and physics of its first propounder. The doctrine of innate ideas, the doctrine that extension is the essence of matter, the doctrine that thought is the essence of mind, the more general doctrine, held also by Bacon, that things have a discoverable essence whence all their properties may be deduced by a process analogous to mathematical reasoning,all collapsed when brought to the test of definite and concrete experience.This avowal in the royal speech called forth John Wilkes in No. 45 of the North Briton, destined to become a famous number indeed. Wilkes had ceased in the North Briton to employ mere initials when commenting on leading men in Parliament or Government; and he now boldly declared that the speech put into the king's mouth by the Ministers was false in its assertion, that the peace was neither honourable to the Crown nor beneficial to the country. This was regarded as a gross insult to his Majesty, though it was avowedly declared to attack only the Ministry; and on the 30th of April Wilkes was arrested upon a general warrant, that is, a warrant not mentioning him or any one by name, but applying to the authors, printers, and publishers of the paper in question. George Grenville, the new Minister, had, of course, the credit of this proceeding; though it was thought that Bute still secretly directed the movements of Government, and that he or the king might be the real author of the order.