1. Dainton, F. S., and James, D. G. L., J. Chim. Phys., 48, 1 (1951).
2. Dainton, F. S., and Logan, S. R., Proc. Roy. Soc., A (in the press).
3. Dainton, F. S., and Fowles, P., Proc. Roy. Soc., A (in the press).
4. Airey, P. L., and Dainton, F. S. (to be published).
5. Czapski, G., and Schwarz, H. A., J. Phys. Chem., 66, 471 (1962).