1. whose noses were colonized by the prevalent type;Henderson, R. J.; Williams, R. E. 0;Brit. med. J,1961
2. McNeill, I. F., Porter, I. A., and Green, C. A. (1961). Ibid., 2, 798.
3. Williams, R. E. O., Jevons, M. P., Shooter, R. A., Hunter, C. J. W., Girling, J. A., Griffiths, J. D., and Taylor, G. W. (1959). Ibid., 2, 658.
4. Williams, R. E. O., Jevons, M. P., Shooter, R. A., Hunter, C. J. W., Girling, J. A., Griffiths, J. D., and Taylor, G. W., Noble, W. C., Jevons, M. P., Lidwell, 0. M., Shooter, R. A., White, R. G., Thom., B. T., and Taylor, G. W. (1962). Ibid., 2, 275.