1. Shemin, D., and Rittenberg, D., J. Biol. Chem., 166, 627 (1946).
2. Finch, C. A., Wolff, J. A., Rath, C. E., and Fluharty, R. G., J. Lab. and Clin. Med., 34, 1480 (1949).
3. Bale, W. F., Yuile, C. L., De La Vergne, L., Miller, L. L., and Whipple, G. H., J. Exp. Med., 90, 315 (1949).
4. Hagen, P. S., Bull. Univ. Minn. Hosp., 23, 552 (1952).
5. Mollison, P. L., “Blood Transfusion in Clinical Medicine” (C. C. Thomas, Springfield, Ill., 1951).