1. Kitamura, T., Arch. Hist. Jap. (in the press).
2. Ito, T., Folia Anat. Jap., 22, 274 (1943).
3. Montagna, W., “The Structure and Function of Skin” (New York, 1956).
4. Sjöstrand, F. S., “Physical Techniques in Biological Research”, 3, (New York, 1956).
5. Maxwell, D. S., and Pease, D. C., J. Biophys. Biochem. Cytol., 2, 467 (1956).