1. Natelson, S. (1951). Amer. J. clin. Path., 21, 1153.
2. Rappaport, F., and Eichhorn, F. (1955). Amer. J. med. Tech., 21, 46.
3. Van Slyke, D. D., and Neill. J. M. (1924). J. biol. Chem., 61, 523.
4. Sixth International Blood Transfusion Congress and Sixth Intemational Hematology Congress This meeting will be held from Monday, September 3, to Wednesday, September 5, 1956, in Boston, Mass. The Sixth International Hematology Congress will meet from Monday,1956
5. International European Congress on Clinical Chemistry The Second International European Congress on Clinical Chemistry will take place in,August 19