1. Luria, S. E., Symposium on Virus Multiplication, Oxford, April 1952 (in the press).
2. Bertani, G., Conference on Bacteriophages, Paris, July 1952 (in the press).
3. Craigie, J., and Felix, A., Lancet, ii, 823 (1947).
4. Craigie, J., and Yen, C. H., Canad. Pub. Health J., 29, 448, 484 (1938).
5. International Committee for Enteric Phage Typing, Proc. Fifth Int. Congress Microbiol., Rio de Janeiro, 1950 (in the press).