1. Gard, S., Arkiv för Kemi, 19, A, No. 21 (1944).
2. Weibull, C., and Tiselius, A., Arkiv för Kemi, 20, B, No. 3 (1945).
3. Weibull, C., Biochim. et Biophys. Acta, 2, 351 (1948).
4. See, for example, Astbury, W. T., Croonian Lecture (1945), Proc. Roy. Soc., B, 134, 303 (1947); also many communications in Nature.
5. MacArthur, I., Nature, 152, 38 (1943).