Note 493 — XI On the Therapeutic Use of Precious and Semi-Precious Stones
Reading edition
Claudii Galeni, “De simplic. medicament., etc.,” lib. ix, cap. 19. “Opera Omnia,” ed. C. G. Kühn, Lipsiæ, 1826, vol. xii, p. 207. See also Duffield Osborne, “Engraved Gems,” New York, 1912, pp. 138, 139.