[206] Nicols, “Faithful Lapidary,” London, 1659, p. 107.
[207] Kluge, “Edelsteinkunde,” Leipsic, 1860, p. 366.
[208] Fernie, “Precious Stones for Curative Wear,” Bristol, 1907, p. 109.
[209] The opal is said to preserve its wearer from disease; and hence, in the East, is much used in the form of amulets.
[210] From “Gems of Beauty,” by the Countess of Blessington, London, 1836.
[211] Sir Walter Scott, “Novels,” The Janson Society, New York, 1907, vol. xxiii, pp. 126-138.
[212] Plinii, “Naturalis historia,” lib. xxxvii, cap. 6.
[213] Plinii, l. c.
[214] Hesselquist, “Voyages and Travels in the Levant,” English trans., London, 1766, pp. 273, 274.
[215] Alberti Magni, Opera Omnia, ed. Borgnet, Parisiis, 1890, vol. v, p. 42.