[380] Cf. Clement, _Protrep._ 12; _Paed._ I, 6; _Strom._ II, 3. Although we cannot be quite certain that φωτισμός and σφραγίς were technical terms of the Greek mysteries, they undoubtedly corresponded to ideas and practices found in both Hellenic and oriental mystic religions. For a full list of authorities see the works of Hatch, Anrich, Wobbermin, and Clemen named, p. 368. [381] Cf. Celsus’ charges, Origen, _C. Cel._ 1, 1, and Origen’s reply, _ibid._, 1, 7. Origen defends an esoteric Christianity by the examples of philosophy and the pagan mysteries. [382] Justin, _Apol._ I, 66. [383] Iren., _Adv. Haer._ IV, 31, 4; frg. 36 Harvey. [384] Ignatius, _ad Eph._ 20. [385] Plin., _Ep._ X, 96. [386] _Apol._ 37. APPENDIX I BIBLIOGRAPHY GENERAL WORKS The relevant articles in the _Encyclopaedia Britannica_, 11 ed., are often valuable, being written by specialists. Of other encyclopedic works the following are most useful: Hastings: _Encyclopaedia of Religion and Ethics_, I-VIII, A-Mulla, 1908-. W. Roscher: _Ausführliches Lexikon der griechischen und römischen Mythologie_, A-Tan, 1884-. Pauly-Wissowa: _Real-Encyclopädie der classischen Altertumswissenschaft_, A-Imperator, Ra-Ryton, 1894-. Daremberg et Saglio: _Dictionnaire des antiquités grecques et romaines_, A-Via, 1887-. GREEK RELIGION.—L. R. Farnell: _The Cults of the Greek States_, 5 vols., 1896-1907. A comprehensive study of the greater divinities. Id.: _The Higher Aspects of Greek Religion_, 1912. L. Campbell: _Religion in Greek Literature_, 1898. J. Adam: _The Religious Teachers of Greece_, 2 ed., 1909. An interesting and valuable book for the period from Homer to Plato. A. Fairbanks: _A Handbook of Greek Religion_, 1910. An admirable treatment of the subject in moderate compass with excellent bibliographies. G. F. Moore: _History of Religions_, I, pp. 406-602, on Greek and Roman Religions, 1913. The work of a master in the entire field. Ed. Meyer: _Geschichte des Altertums_, II-V, 1893-1902. The religion of the Greeks is nowhere else so well treated from the historical point of view. G. F. v. Schoemann: _Griechische Altertümer_, 4 ed., by Lipsius, II, pp. 133-607, 1902. P. Stengel: _Die griechischen Kultusaltertümer_, 2 ed., 1898. The best treatment of the religious antiquities of the Greeks. O. Gruppe: _Griechische Mythologie und Religionsgeschichte_, 2 vols., 1897, 1906. This is the most comprehensive work dealing with the subject; its value is somewhat impaired by the author’s peculiar views. S. Wide: _Griechische und Römische Religion_, in Gercke und Norden: _Einleitung in die Altertumswissenschaft_, 2 ed., II, pp. 169-271, 1912. MYTHOLOGY.—_The Mythology of all Races_, I, _Greek and Roman_, by W. S. Fox, 1916. A modern presentation of the myths connected with the chief gods; the book is well illustrated and is provided with an ample bibliography. Preller: _Griechische Mythologie_, I, 4 ed., by Robert, 1894; II, 3 ed., by Plew, 1872.