In proportion as the sphere of philosophy in the Hellenistic world narrowed to the consideration of the Useful and the Practicable, the sphere of its influence widened. Alexander’s expedition had thrown the East open to Greek civilisation, and the assiduous and subjective temperament of the youth of the Semitic peoples was drawn to the wisdom of the Greeks. An active process of endosmosis and exosmosis set in between the countries of the West and East. During the period from the third to the first century B.C. this interchange created a new civilisation, destined to form the basis of the _Imperium Romanum_ in matters temporal and the _Imperium Christi_ in matters spiritual. But at this period the clear outlines of development tend to become blurred. As the Hellenic nation expands into the Hellenistic peoples, as the national language of Greece becomes the common medium of the East, nay, of the whole civilised world, the eclecticism which had been formed out of certain elements of the old Greek philosophy under the dominant influence of the Stoa gained ground on all sides. In the time of Christ, Greek philosophy is an indispensable requisite of the higher culture, and the university of Athens, with its professors, whose appointment the state soon took upon itself, is the one where the educated Roman and Cappadocian alike must have studied. The Greek private tutor, recommended by the head of some school or other at Athens, becomes a standing institution in Roman families of distinction, and is treated with the contempt due to such a _Græculus_, ranking first among the slaves of the household. Times soon change, however. Under the philosopher Marcus, philosophy gained admission to courtly circles, and presently became indispensable in the conflict with the increasing might of Christianity. After the Christian conception of the world had conquered under Constantine, the university of Athens became the bulwark of Paganism. Neo-Platonism, a new philosophy bred of the enthusiastic temperament of the East, the congenial philosophy of Plato and the erudition of Aristotle, fought the last fight with the courage of despair. But though its champions were, for the most part, superior in courage, moral character, and scientific learning to the bishops whom they withstood, philosophy and the ancient world had played out their part. In the latter end of the period of antiquity the overseer of any craft (as, for example, the overseer of the quarrymen in the _Passio Sanctorum IV Coronatorum_) was called in popular parlance _philosophus_ to distinguish him from the artisans. _Sic transit gloria mundi._ I