[186] Caii Plinii Secundi, Naturalis Historia, ed. Harduin, Parisiis, 1741, vol. ii, p. 489.
[187] King, Catalogue of Engraved Gems, Metropolitan Museum of Art, p. 81, No. 302, 1885.
[188] Dissert. apol. de quibusdam Alexandri Severi numismat., p. 59. Cited in Dictionnaire de l’arch. chrét., vol. i, Pt. II, Paris, 1907, cols. 1789, 1790, where the amulet is figured.
[189] Camilli Leonardi, Speculum Lapidum, Venetia, 1502.
[190] Pitra, “Specilegium Solesmense,” Parisiis, 1885, vol. iii, pp. 326, 327.
[191] Camilli Leonardi, “Speculum Lapidum,” Venetia, 1502, ff. lvi-lvii.
[192] From an anonymous Italian treatise in a fourteenth century MS. in the author’s collection; fol. 40 verso, 41 recto.
[193] Hoernes, “Urgeschichte der bildenden Kunst,” Vienna, 1898, p. 338.
[194] Hoernes, “Urgeschichte der bildenden Kunst,” Vienna, 1898, p. 338.
[195] King, “The Gnostics and their Remains,” London, 1864, p. 238, figure opp. p. 115.