1. Alexander, P., and Earland, C., Textile Res. J., 20, 298 (1950).
2. Bamford, C. H., Hanby, W. E., and Happey, F., Nature, 164, 751 (1949).
3. Happey, F., and Wormell, R. L., J. Text. Inst. (December 1949); Nature, 163, 17 (1949).
4. Bamford, C. H., Hanby, W. E., and Happey, F. (in course of publication).
5. Ambrose, E. J., Elliott, A., and Temple, R. B., Nature, 163, 859 (1949).