[272] C. Drury Fortnum, “Notes on Some of the Antique and Renaissance Gems and Jewels in Her Majesty’s Collection at Windsor Castle,” London, 1876, pp. 26, 27.
[273] George Frederick Kunz, “The Etiquette of Gems,” Saturday Evening Post, June 27, 1908, p. 5.
[274] Augusta Huiell Seaman, “The Sapphire Signet,” New York, The Century Co., 1916.
[275] C. W. King, “The Natural History of Precious Stones,” London, 1870, p. 254; Duffield Osborne, “Engraved Gems,” New York, 1912, p. 293. First published by Ducange, in the seventeenth century.
[276] From letters of Ex-President Taft and of Private Secretary Tumulty to the author.
[277] Chabouillet, “Catalogue général et raisonné des camées et pierres gravées de la Bibliothèque Nationale,” Paris, 1858, p. 388, 389; Nos. 2636, 2639.
[278] M. Deloche, “Étude historique et archéologique sur les anneaux sigillaires et autres des premiers siècles du moyen âge,” Paris, 1900, pp. 90–92, figure.
[279] “The Gulistân or Rose Garden,” trans. by Edward B. Eastwick, London, 1880, p. 148.
[280] Francisci Petrarchæ, “De remediis,” Genevæ, 1613, p. 151.
[281] Francisci Petrarchæ, op. cit., p. 147.