The investigation into the two great problems of the origin of society and the philosophy of history occupies such an important position in the evolution of Greek thought that, to obtain any clear view of the workings of the critical spirit, it will be necessary to trace at some length their rise and scientific development as evinced not merely in the works of historians proper, but also in the philosophical treatises of Plato and Aristotle.  The important position which these two great thinkers occupy in the progress of historical criticism can hardly be over-estimated.  I do not mean merely as regards their treatment of the Greek Bible, and Plato’s endeavours to purge sacred history of its immorality by the application of ethical canons at the time when Aristotle was beginning to undermine the basis of miracles by his scientific conception of law, but with reference to these two wider questions of the rise of civil institutions and the philosophy of history.