1. Poole, J. C. F., and Florey, H. W., J. Path. Bact., 75, 245 (1958).
2. Rannie, I., and Duguid, J. B., J. Path. Bact., 66, 395 (1953).
3. French, J. E., in “Lectures on General Pathology”, ed. H. W. Florey, 2nd edit (London, 1958).
4. Stewart, G. T., Brit. J. Exp. Path., 39, 109 (1958).
5. de Lalla, O. F., and Gofman, J. W., in “Methods of Biochemical Analysis”, 1 (ed. Glick) (New York, 1954).