1. Drumonde, D. C., Al-Ashari, S., Lawrence, H. I., and Thomas, L., Nature, 198, 598 (1963).
2. Mann, jun., L. T., Carson, J. M., and Dammin, G. J., Nature, 193, 168 (1962).
3. Faure, J. P., Arch. Ophthalm., 24, 502 (1964).
4. Payrau, P., Pouliquen, Y., and Faure, J. P., Annales Oculist., 194, 1 (1961).
5. Robert, L., Oudea, P., Zweibaum, A., Parlebas, J., and Robert, B., in Protides of Biological Fluids, edit. by Peeters, H., 12, 110 (Elsevier, Amsterdam, 1965).