1. Gratia, A., C.R. Soc. Biol. Paris, 93, 1040 (1925).
2. Fredericq, P., C.R. Soc. Biol. Paris, 140, 1189 (1946).
3. Fredericq, P., Ann. Rev. Microbiol., 11, 7 (1957).
4. Adams, M. H., Bacteriophage, 381 (Interscience, London, 1959).
5. Jacob, F., Lwoff, A., Siminovitch, L., and Woollman, E. L., Ann. Inst. Pasteur, 84, 222 (1953).