1. Potter, E. L., "Rh, its Relation to Congenital Hæmolytic Disease" (Chicago, 1947).
2. Bessis, M., "La maladie hémolytique du nouveau-né" (Paris, 1947).
3. Levine, P., Blood, the Journal of HÅ"matology, Special Issue 2, 3 (1948).
4. Race, R. R., Blood, the Journal of HÅ"matology, Special Issue 2, 27 (1948).
5. Race, R. R., and Mourant, A. E., personal communication (1948).