1. Ball, S., Collins, F. D., Morton, R. A., and Stubbs, A. L., Nature, 161, 424 (1948).
2. Lythgoe, R. J., J. Physiol., 89, 331 (1937).
3. Hecht, S., "Annual Review of Biochemistry" 11, 465 (1942).
4. Broda, E. E., Goodeve, C. F., and Lythgoe, R. J., J. Physiol., 98, 397 (1940).
5. Dartnall, H. J. A., Goodeve, C. F., and Lythgoe, R. J., Proc. Roy. Soc., A, 156, 158 (1936); A, 164, 216 (1938).