1. Dubos, R. J., and Davis, B. D. (1946). J. exp. Med., 83, 409.
2. Fisher, M. W. (1948a). Amer. Rev. Tuberc., 57, 53.
3. Fisher, M. W. (1948b). Ibid., 57, 58.
4. Fisher, R. A., and Yates, F. (1948). Statistical Table for Biological, Agricultural, and Medical
5. Table VIII2;Research;Medical Research Council,1948