1. 1) M. Shibata, E. Higashide, T. Kanzaki, H. Yamamoto and K. Nakazawa, This Journal, 25, 171 (1961).
2. 2) T. Araki, Y. Oka and K. Tsuchiya, Annual Reports of the Takeda Research Laboratory, 19, 131 (1960).
3. 3) H. Hitomi, S. Horii, T. Yamaguchi and A. Miyake, J. Antibiotics in press.
4. 4) N. Ishida and J. Miyazaki, Annual Reports of the Takeda Research Laboratory, 5, 481 (1952).
5. 5) W. Gasson and S. A. Waksman, Proc. Nat. Acad. Science, 34, 232 (1948).