1. Bennett, E. L., Rosenzweig, M. R., Krech, D., Karlsson, H., Dye, N., and Ohlander, A., J. Neurochem., 3, 144 (1958).
2. Tryon, R. C., in “Yearbook Nat. Soc. Stud. Educ.”, 39, Part 1, 111 (1940).
3. Roderick, T. H. (unpublished doctoral dissertation, University of California, 1958).
4. Rosenzweig, M. R., Krech, D., and Bennett, E. L., in “Neurological Basis of Behaviour”, edit. by Wolstenholme, G. E., and O'Connor, C. M., 337 (Ciba Foundation Symposium : Churchill, London, 1958).
5. Crossland, J., J. Physiol., 114, 318 (1951).