1. Smithies, O., Biochem. J., 61, 629 (1955).
2. Lush, I. E., Nature, 189, 981 (1961).
3. Steven, F. S., Ph.D. thesis, University of St. Andrews (1958).
4. Steven, F. S., and Tristram, G. R., Biochem. J., 70, 179 (1958).
5. Romanoff, A. L., and Romanoff, A. J., The Avian Egg (J. Wiley, Inc., New York, 1949).