1. Laug, E. P., Kunze, F. M., and Prickett, C. S., Arch. Indust. Hyg., 3, 245 (1951).
2. Dénes, A., 1963-Year-Book of the Institute of Nutrition (Budapest), 47 (1964).
3. Quinby, G. E., Hayes, jun., W. J., Armstrong, J. F., and Durham, W. F., J. Amer. Med. Assoc., 191, 175 (1965).
4. Durham, W. F., Armstrong, J. F., and Quinby, G. E., Arch. Environ. Health, 11, 76 (1965).
5. Durham, W. F., Armstrong, J. F., and Quinby, G. E., Arch. Environ. Health (in the press).