1. R. Fahre, R. Truhaut, andS. Laham, C. r. acad. sci., Paris250, 2655 (1960).
2. R. Fabre, R. Truhaut, andS. Laham, Archs. mal. prof. m�d. trav.21, 314 (1960).
3. S. Laham, Proc. XIIIth Intern. Congress of Occupational Health, July 25?29, 1960. New York City. p. 735?738.
4. O. Schnitzen andC. Grabe, Arch. Anat. Physiol.1867, 166.
5. R. T. Williams, Detoxication Mechanisms. New York: Wiley. 1959.