1. Discussions of the Faraday Society, “Crystal Growth”, 5 (1949).
2. Gibbs, J. W., “Collected Works” (1878), 1 (Longmans, Green and Co., 1928), footnote on p. 325.
3. Volmer, M., Physik. Z., 22, 646 (1921).
4. Stranski, I. N., and Kaischew, R., Physik. Z., 36, 393 (1935).
5. Becker, R., and Döring, W., Ann. Physik, 24, 719 (1935).