1. Ouchterlony, Ō., Ark. Kemi. Min. Geol., 26B, 1 (1948). Wilson, M. W., and Pringle, B. H., J. Immunol., 73, 232 (1954). Oudin, J., “Methods in Medical Research”, 5 (The Year Book Publishers, Chicago, 1951). Jennings, R. K., J. Bact., 67, 559 (1954).
2. Burtin, P., Bull. Sté. Chim. Biol., 36, 1021 (1954).
3. Billingham, R. E., and Medawar, P. B., J. Exp. Biol., 28, 385 (1951).
4. Frederick, G. L., and Begg, R. W., Proc. Amer. Assoc. Cancer Res., 1, 14 (1954).
5. Grabar, P., and Williams, J. A., Biochim. Biophys. Acta, 10, 193 (1953). Björklund, B., Proc. Soc. Exp. Biol. and Med., 85, 438 (1954). Korngold, L., and Lipari, R., Science, 121, 170 (1955).