To discuss with any attempt at completeness the influence of the past upon the belief in magic in the Empire lies, however, outside the province of this essay. Pliny has shown us something of the union of magic with science in the literature before his day. Philo of Alexandria, Apuleius and the fame of Hermes Trismegistus may give us some notion of the influence of the East. In other writers of the period of which we treat one may discern further traces of the thought and learning of the past. In general such evidence must suffice. We shall, however, presently take occasion to support our contention that Pliny gives one a fairly good idea of science before his day, by a few citations from two writers of repute, one a Greek and one a Roman, of the period before the Empire. Moreover, the great historical importance of Greek philosophy and the fact that, besides playing a prominent part in Roman culture, it exercised a powerful direct influence on Christian Europe long after the fall of Rome, seem to justify some treatment of its doctrines. Especially may we mention Plato and Aristotle, who exerted great influence not only during classical times, but also the one in the Middle Ages, the other in the period following the decline of Scholasticism. We naturally incline to regard this earlier period of more or less distinctively Greek thought and learning as a golden age, comparatively speaking, characterized by sane thinking if not also by careful investigation of nature, and free from superstition, credulity and mysticism. The general opinion seems to be that magic entered science and learning and was accepted by men of intellectual prominence only when mental decay had set in and when Oriental influence had become a powerful force.