Out of this situation emerged, if I mistake not, the entire tradition regarding the function and office of philosophy which till very recently has controlled the systematic and constructive philosophies of the western world. If I am right in my main thesis that the origin of philosophy lay in an attempt to reconcile the two different types of mental product, then the key is in our hands as to the main traits of subsequent philosophy so far as that was not of a negative and heterodox kind. In the first place, philosophy did not develop in an unbiased way from an open and unprejudiced origin. It had its task cut out for it from the start. It had a mission to perform, and it was sworn in advance to that mission. It had to extract the essential moral kernel out of the threatened traditional beliefs of the past. So far so good; the work was critical and in the interests of the only true conservatism--that which will conserve and not waste the values wrought out by humanity. But it was also precommitted to extracting this moral essence in a spirit congenial to the spirit of past beliefs. The association with imagination and with social authority was too intimate to be deeply disturbed. It was not possible to conceive of the content of social institutions in any form radically different from that in which they had existed in the past. It became the work of philosophy to justify on rational grounds the spirit, though not the form, of accepted beliefs and traditional customs. The resulting philosophy seemed radical enough and even dangerous to the average Athenian because of the difference of form and method. In the sense of pruning away excrescences and eliminating factors which to the average citizen were all one with the basic beliefs, it was radical. But looked at in the perspective of history and in contrast with different types of thought which developed later in different social environments, it is now easy to see how profoundly, after all, Plato and Aristotle reflected the meaning of Greek tradition and habit, so that their writings remain, with the writings of the great dramatists, the best introduction of a student into the innermost ideals and aspirations of distinctively Greek life. Without Greek religion, Greek art, Greek civic life, their philosophy would have been impossible; while the effect of that science upon which the philosophers most prided themselves turns out to have been superficial and negligible. This apologetic spirit of philosophy is even more apparent when Medieval Christianity about the twelfth century sought for a systematic rational presentation of itself and made use of classic philosophy, especially that of Aristotle, to justify itself to reason. A not unsimilar occurrence characterizes the chief philosophic systems of Germany in the early nineteenth century, when Hegel assumed the task of justifying in the name of rational idealism the doctrines and institutions which were