1. Landsteiner, K., “The Specificity of Serological Reactions” (Cambridge, Mass., 1947).
2. Bird, G. W. G., J. Immunol., 69, 319 (1952).
3. Boyd, W. C., and Reguera, R. M., J. Immunol., 62, 333 (1949).
4. Liener, I. E., and Pallansh, M., J. Biol. Chem., 197, 29 (1952).