1. Howard, J. G. et al., Brit. J. Exp. Path., 40, 281 (1959). Suter, E., et al., Proc. Soc. Exp. Biol. (N.Y.), 99, 167 (1958). Uhr, J. W., et al., J. Exp. Med., 108, 891 (1958).
2. Webster, M. E. et al., J. Immunol., 74, 455 (1955).
3. Stetson, C. A. et al., Fed. Proc., 17, 536 (1958).
4. Johanovský, J., Fourth European Cong. Allergology (London, 1959); Folia Microbiol. (Prague), 5, No. 6 (1960).
5. Vejbora, O. et al., Folia Microbiol. (Prague) (in the press).