1. U. S. Pat. 2,190,593; 2,190,594, and others.
2. U. S. Pat. 2,000,274, and others.
3. “Le Raffinge des Corps Gras,” p. 60, G. Porchez-Dunod, Paris, 1938.
4. “Vegetable Fats and Oils,” G. S. Jamieson; pp. 400-02, Chemical Catalogue Co., New York, 1932.