1. 1) E. A. Hamm and E. van Norman: J. App. Phys., 19, 1097 (1947).
2. 2) N. Sasaki, R. Ueda, and Y. Kubota: Read at the Osaka Meeting of Society of Electron Microscope, Japan, Nov. (1950).
3. E. Suito and N. Uyeda: Read at the Kyoto Meeting of Chemical Society of Japan, May (1951);
4. Bull. Inst. Chem. Res., Kyoto Univ., 32, 83 (1954).
5. 4) E. Suito and N. Uyeda: J. Electronmicroscopy, 4 (1956) (in press).