1. Crowley, L. V., and Hyland, F. R. (1962). Amer. J. clin. Path., 37, 244.
2. Personal communication to Crowley and Hyland;Griffitts, J.J.,1962
3. Moore, B. P. L., Linins, I., and McIntyre, J. (1959). Blood, 14, 364.
4. Vox Sang;Weiner, W.; L, Hallum J.;(Basel),1957
5. Tovey, G. H., Gillespie, E. M., Lewis, H. B. M., and Holliday, T. D. S. (1956). Ibid., 1, 279.