1. Albert, K., Hoch, P., and Waelsch, H. (1946). J. nerv. ment. Dis., 104, 263.
2. Albert, K., Hoch, P., and Waelsch, H. (1951). Ibid., 114, 471.
3. Ayres, P. J., and Mcllwain, H. (1953). Biochem. J. In the press.
4. Barker, S. B., and Summerson, W. H. (1941). J. biol. Chem., 138, 535.
5. Castex, M. R., Camponovo, L. E., and Labourt, F. E. (1948). Pren. med. argent., 35, 1327.