1. 1) H. Wieland and G. Reverey: Z. physiol. Chem., 140, 186 (1924).
2. 2) Y. Abe: J. of Bioch., 25, 181 (1937).
3. 3) Y. Abe and M. Nishimura: Jap. J. of Experimental Digestive Diseases, 13, 813 (1938).
4. T. Nagano: Jap. J. of Gastroenterogy, 39, 163 (1940);
5. Jap. J. of Bioch. Soc., 15, 168 (1940);