to Isis and Osiris, in which the mythical history of the goddess is as thickly covered with allegorical interpretations as the statue dedicated to her by the Spanish lady was with emeralds and pearls. Another form of naturalistic religion, fitted for universal acceptance by its appeals to common experience, was the worship of the Sun. It was probably as such that Mithras, a Syro-Persian deity, obtained a success throughout the Roman empire which at one time seemed to balance the rising fortunes of Christianity. Adoration of the heavenly bodies was, indeed, very common during this period, and was probably connected with the extreme prevalence of astrological superstition. It would also harmonise perfectly with the still surviving Olympian religion of the old Hellenic aristocracy, and would profit by the support which philosophy since the time of Socrates had extended to this form of supernaturalist belief. But, perhaps, for that very reason the classes which had now become the ultimate arbiters of opinion, felt less sympathy with Mithras-worship and other kindred cults than with the Egyptian mysteries. These had a more recognisable bearing on their own daily life, and, like the Chthonian religions of old Greece, they included a reference to the immortality of the soul. Moreover, the climate of Europe, especially of western Europe, does not permit the sun to become an object of such excessive adoration as in southern Asia. Mithras-worship, then, is an example of the expansive force exhibited by Oriental ideas rather than of a faith which really satisfied the wants of the Roman world.