1. Aslett, E., and Jarman, T. F. (1945).Lancet, i, 304.
2. Bailey, W. H. (1948).Amer. Rev. Tuberc., 57, 621.
3. Bishop, H. A. (1931). ——Ibid., 23, 90.
4. Blumberg, N., and Labowsky, L. W. (1940).Dis. Chest, 6, 211.
5. Bohorfoush, J. G. (1943).Amer. Rev. Tuberc., 47, 263.