[22]. Konrad von Megenberg, “Buch der Natur,” ed. by Dr. Franz Pfeiffer, Stuttgart, 1861, p. 456.
[23]. Volmar, “Steinbuch,” ed. by Hans Lambel, Heilbronn, 1877, p. 24.
[24]. St. Hildegardæ, “Opera omnia,” in Pat. Lat., ed. J. P. Migne, vol. cxcvii, col. 1260.
[25]. D’Herbelot, “Bibliothèque Orientale,” La Haye, 1778, p. 230.
[26]. Clouston, “A Group of Eastern Romances,” Glasgow, 1889.
[27]. “Nützliche Versuche und Bemerkungen aus dem Reich der Natur,” Nürnberg, 1760; cited by Bolton.
[28]. Bolton, “Contributions of Alchemy to Numismatics,” New York, 1890, pp. 17, 18.
[29]. Ashmole, “Theatrum chemicum Brittanicum,” London, 1652, pp. 4–6.
[30]. Spencer and Gillen, “The Native Tribes of Central Australia,” London, 1899, pp. 525–529.
[31]. Rumphius, “D’Ambonische Rariteitskamer,” Amsterdam, 1741, p. 291.