1. Utz, F., Apoth.-Zeit.,15, 28–29, 38–39 (1900).
2. American Oil Chemists' Society, Official and Tentative Methods, 2nd ed., 1946.
3. Tocher, J. F., Pharm. J. and Trans., 1890/91, 638–640.
4. Tocher, J. F., Pharm. J. and Trans., 1892/93, 700–702.
5. Villavecchia, V., and Fabris, G., Zeitschr. angew. Chem.,17, 505–506 (1893). See also J. Soc. Chem. Ind.,1894, 69.