1. L. D. Felton, J. Immunology, 21, 357 (1931), and other papers.
2. M. Heidelberger and F. E. Kendall, J. Exp. Med., (Aug. 1936).
3. See for example, T. Svedberg, Chem. Rev., 14, 1 (1934); Kolloid Z., 67, 2 (1934).
4. A. Tiselius, Nova Acta Reg. Soc. Scient. Upsaliensis, Ser. IV, 7, No. 4. See also Pedersen, K.O., Kolloid Z., 63, 268 (1933).
5. M. Heidelberger and F. E. Kendall, J. Exp. Med., 61, 559 (1935); P. 570.