1. Patt, H. M., and Brues, A. M., “Radiation Biology”, edit. by Hollaender, 1 (2), 940 (McGraw-Hill, 1954).
2. Baldwin, W. F., and Salthouse, T. N., Rad. Res. (in the press).
3. Evans, J., Neary, G. J., and Tonkinson, S. M., Nature, 181, 1083 (1958).