1. 1) Sc. P. Inst. Phys. & Chem. Research Japan, 3 (1925), 81.
2. 2) Biochem. Zeitsch., 203 (1929), 370; Helv. Chim. Acta, 12 (1929), 278.
3. 3) Biochem. Journ., 13 (1919).
4. 4) Biochem. Journ., 19 (1925), 1065.
5. 5) Biochem. Journ., 14 (1920), 715.