1. Gessler, A. E., Bender, C. E., and Parkinson, M. C., Trans. N.Y. Acad. Sci., 18, 701 (1956).
2. Epstein, M. A., Brit. J. Exp. Path. (in the press). Holt, S. J., and Epstein, M. A., ibid. (in the press).
3. Epstein, M. A., Brit. J. Cancer (in the press).
4. Epstein, M. A., Brit. J. Cancer, 11, 268 (1957).
5. Luft, J. H., J. Biophys. Biochem. Cytol., 2, 779 (1956).