1. Hollander, D. H., and Nell, E. E., App. Microbiol., 2, 164 (1954).
2. Howard, D. H., J. Bacteriol., 71, 625 (1956).
3. Linscott, W. D., and Boak, R. A., J. Bacteriol., 80, 573 (1960).
4. Polge, C., and Soltys, M. A., in Recent Research in Freezing and Drying, edit. by Parkes, A. S., and Smith, A. U., 87 (Charles C. Thomas, Pub., Springfield, 1960).
5. Eyles, D. E., Coleman, N., and Cavanaugh, D. J., J. Parasitol., 42, 408 (1956).