1. Van Atta, G. R., Houston, D. F., and Dietrich, W. C., accompanying article.
2. Brice, B. A., Swain, M. L., Schaefer, B. B., and Ault, W. C., Oil and Soap,22, 219 (1945).
3. American Association of Textile Chemists and Colorists Yearbook,17, 216 (1940).