19. Lucian's authorship of the treatise [Greek: Peri tes Suries theou] has been questioned but wrongly; see Maurice Croiset, _Essai sur Lucien_, 1882, pp. 63, 204. I am glad to be able to cite the high authority of Noeldeke in favor of its authenticity. Noeldeke writes me on this subject: "Ich habe jeden Zweifel daran schon lange aufgegeben.... Ich habe lange den Plan gehabt, einen Commentar zu diesem immerhin recht lehrreichen Stueck zu schreiben and viel Material dazu gesammelt. Aus der Annahme der Echtheit dieser Schrift ergiebt sich mir, dass auch das [Greek: Peri astronomias] echt ist." 20. Cf. Frisch, _De compositione libri Plutarchei qui inscribitur_, [Greek: Peri Isidos], Leipsic, 1906, and the observations of Neustadt, _Berl. Philol. Wochenschr._, 1907, p. 1117.--One of Plutarch's sources is the [Greek: Ioudaika] by Apion.--See also Scott Moncrieft, _Journ. of Hell. Studies_, XIX, 1909, p. 81. 21. See ch. VII, pp. 202-203. 22. Cf. _Mon. myst. Mithra_, I, p. 75, p. 219.--For Egypt see Georges Foucart, "L'art et la religion dans l'ancienne Egypte," _Revue des idees_, Nov. 15, 1908. 23. The narrative and symbolic sculpture of the Oriental cults was a preparation for that of the Middle Ages, and many remarks in Male's beautiful book _L'Art du XIII^e siecle en France_, can be applied to the art of dying paganism. II. WHY THE ORIENTAL RELIGIONS SPREAD. BIBLIOGRAPHY: Boissier, _La religion romaine d'Auguste aux Antonins_, especially Bk. II, ch. II.--Jean Reville, _La religion a Rome sous les Severes_, Paris, 1886.--Wissowa, _Religion und Cultus der Roemer_, Munich, 1902, pp. 71 ff., 289 ff.--Samuel Dill, _Roman Society from Nero to Marcus Aurelius_, London, 1905.--Bigg, _The Church's Task Under the Roman Empire_, {219} Oxford, 1905.--Cf. also Gruppe, _Griech. Mythologie und Religionsgeschichte_, 1906, pp. 1519 ff.--Wendland, _Die hellenistisch-roemische Kultur in ihren Beziehungen zum Judentum und zum Christentum_, Tuebingen, 1907, pp. 54 f.--The monographs will be cited in connection with the different cults which they treat. 1. _Melanges Fredericq_, Brussels, 1904, pp. 63 ff. (_Pourquoi le latin fut la seule langue liturgique de l'Occident_); cf. the observations of Lejay, _Rev. d'hist. et litt. relig._, XI, 1906, p. 370. 2. Holl, _Volkssprache in Kleinasien_ (_Hermes_, 1908, pp. 250 ff.). 3. The volume of Hahn, _Rom und Romanismus im griechisch-roemischen Osten bis auf die Zeit Hadrians_ (Leipsic, 1906) discusses a period for the most part prior to the one that interests us. On the period following we have nothing but a provisional sketch by the same author, _Romanismus und Hellenismus bis auf die Zeit Justinians_ (_Philologus_, Suppl. X), 1907. 4. Cf. Tacitus, Annales, XIV, 44: "_Nationes in familiis habemus quibus diversi ritus, externa sacra aut nulla sunt._" 5. S. Reinach, _Epona_ (Extr. _Rev. archeol._). 1895.