1. Ornstein, L. (in preparation).
2. Ornstein, L., and Davis, B. J. (personal communications).
3. A preliminary report of this work was presented at the 141st meeting of the American Chemical Society, Washington, D.C., March 24, 1962.
4. Longsworth, L. G., Electrophoresis, edit. by Bier, M., 101 (Academic Press, 1959).