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2. Chauffard, A., and Troisier, J. (1908). Sem. mid., Paris, 28, 345, 539. (Also Bill. Soc. mid. H6p.
3. Paris, 1908, p. 94.) and Vincent, C. (1909). Ibid., 29, 601.
4. Coombs, R. R. A., Mourant, A. E., and Race, R. R. (1945). Brit. J. exp. Path., 26, 255.
5. Dacie, J. V. (1949). Blood, 4, 928.