1. Chernoff, A. I., New Eng. J. Med., 253, 322, 365 and 416 (1955).
2. Evans, J. V., King, J. W. B., Cohen, B. L., Harris, H., and Warren, F. L., Nature, 178, 849 (1956).
3. Cabannes, R., and Serain, C., C.R. Soc. Biol., Paris, 149, 7 (1955).
4. Jonxis, J. H. P., Barcroft Memorial Conference, 261, (Butterworths Scientific Publications, 1949).
5. Report of Milk Marketing Board. Report of Production Division, Milk Marketing Board, No. 6, Thames Ditton, Surrey (1955–56).