1. A. Hunter, Z. physiol. Chem., 52, 526 (1907).
2. A. Kossel, “The Proteins and Histones”, Longmans, Green and Co., London, New York, Toronto, 1928.
3. H. G. Bungenberg de Jong, in “Colloid Science,” vol II, H. Kruyt, Editor, chapter 10, Elsevier, Amsterdam, 1949.
4. R. Kuhn and co-workers. Ber. d. Deutchen chem. Gesellschaft, 73, 1080 (1940).
5. L. B. Jacques, F. C. Monkhouse, and M. J. Stewart, Physiol., 109, 41 (1949).