1. Hašek, M., and Hašková, V., presented at the Conference on the Biological Basis of Tissue Transplantation, Prague, 1957, see Transpl. Bull., 5, 69 (1958).
2. Terasaki, P. J., Cannon, J. A., and Longmire, W. P., J. Immunol., 81, 246 (1958). Billingham, R. E., and Brent, L., Phil. Trans. Roy. Soc., B, 242, 439 (1959).
3. Hašek, M., Hraba, T., and Hort, J., Nature, 183, 1199 (1959).
4. Brent, L., Brown, J. B., and Medawar, P. B., “Biological Problems of Grafting”, 64 (Liège, 1959). Stetson, C. A., ibid., 79.