1. Adams, M. H., in Bacteriophages, 117 (Interscience Publishers, Inc., New York, 1959).
2. Gurvich, A. E., Kuzovleva, O. B., and Tumanova, A. E., Biokhimiya, 26, 934 (1961).
3. Hales, C. N., and Randle, P. J., Biochem. J., 88, 137 (1963).
4. Hughes-Jones, N. C., Gardner, B., and Telford, R., Immunology, 7, 72 (1964).
5. Miles, L. E. M., and Hales, C. N., Biochem. J. (in the press).