1. 1) Present series of experiments were financed by the Grant in Aid for Scientific Research from the Ministry of Education and the donation from the Kao Soap Co., Ltd. for which the authors express their deep gratitude.
2. 2) T. Mukai, M. Kunori, H. Kishi, T. Muroi, and K. Matsui: Proc. Japan Acad., 27, 410 (1951).
3. 3) Microanalyses were carried out by Messrs, Hirai, and Kawamoto of the Sankyo Co., Ltd.
4. Ad. Claus und J. Joachim: Ann., 266, 210 (1891);
5. R. Leuckart, Ber. 19, 175 (1886).