1. Karpe, G., and Tansley, K., J. Physiol., 107, 272 (1947).
2. Granit, R., “Sensory Mechanisms of the Retina” (Oxford Univ. Press, 1947).
3. Adrian, E. D., J. Physiol., 104, 84 (1945).
4. Enroth, Ch., Proc. VII Scand. Physiol. Soc., Acta Physiol. Scand. (in course of publication).