[172] Oneirocritica, lib. ii, cap. 5.
[173] F. H. Marshall, “Catalogue of the Finger Rings, Greek, Etruscan, and Roman, in the Departments of Antiquities, British Museum,” London, 1907, p. xxxvii; see plate xxiv, Nos. 1621, 1624.
[174] Figured in Leviticus, “Geillustreerde encyclopedie der diamantnijverheid,” Haarlem, 1907, p. 229.
[175] “The Heber R. Bishop Collection of Jades,” New York, vol. ii, p. 259, illustration.
[176] Science, vol. iv, No. 82, pp. 172, 173, with cut of the ring; vol. iv, No. 85, pp. 270, 271, communication by Edward S. Morse on the subject; vol. vi, No. 126, July 3, 1885, reply of George F. Kunz, citing letter of Lieut. G. C. Foulke, U.S.N., of U. S. Legation at Seoul, Corea.
[177] Communicated by Stewart Culin, Brooklyn Institute.
[178] Heinrich Fischer, “Nephrit und Jadeit,” Stuttgart, 1880, pp. 39, 334, fig. 52 on page 39.
[179] George H. Pepper, “The Exploration of a Burial Room in Pueblo Bonito, New Mexico,” Putnam Anniversary Volume, New York, 1909, p. 244, fig. 7.
[180] F. H. Marshall, “Catalogue of the Finger Rings, Greek, Etruscan and Roman, in the ... British Museum,” London, 1907, p. xxxii.
[181] A natural or artificial mixture of gold and silver found native at Vorospotak, Transylvania, and elsewhere, mentioned by Herodotus. The electros, ἧλεκτρος, of Homer and Strabo; Pliny, xxxiii, 23; although this word was most frequently used to designate amber. Varying in specific gravity from 15.5 to 12.5. The ratio of gold to silver is 1:1. Specific gravity of gold, 19.33; silver, pure, 10.5; correspond to 35.3 per cent. of silver, gold 64.7 per cent. Pliny states that when the proportion of silver to gold is 1:4 (20 per cent.), it is called electra.