1. Auerbach, C., and Robson, J. M., Nature, 157, 302 (1946).
2. Auerbach, C., and Robson, J. M., Proc. Roy. Soc. Edin., B, 62, 271 (1947).
3. Auerbach, C., and Robson, J. M., Proc. Roy. Soc. Edin., B, 62, 284 (1947).
4. Horowitz, N. H., Houlahan, M. B., Hungate, M. G., and Wright, B. Science, 104, 233 (1946).
5. Darlington, C. D., and Koller, P. C., Heredity, 1, 187 (1947.