1. Partington, ” Origins and Development of Applied Chemistry”, London: Longmans, Green and Co., Ltd., 1935. 23, 181.
2. O. S. Johnson, ” A Study of Chinese Alchemy”, Shanghai, 1928. Wieger, ” Taoisme”, Hien Hien, 1911–13. W. A. P. Martin, ” The Lore of Cathay”, New York, 1901.
3. Berthelot, ” Collection des Alchimistes Grecs”, 3 vols., Paris, 1888. F. Sherwood Taylor, ” A Survey of Greek Alchemy”, J. Hellenic Studies, 50, 109–139; 1930.
4. Edkins, Trans. China Branch Roy. Asiat. Soc., Hong Kong, 1855, pt. 5, 83–89; a valuable paper; cf. Partington, NATURE, 120, 158; 1927. Johnson, ref. 2, curiously omits to mention it.
5. Lu-Chi'ang Wu and T. L. Davis, Isis, 18, 210–289; 1932. Davis, Scientific Monthly, Sept. 1930.