1. Bessey, 0. A., Lowry, 0. H., and Brock, M. J. (1946). J. biol. Chem., 164, 321.
2. Bodansky, A. (1933). Ibid., 101, 93.
3. Bray, J., and King E. J. Folin, O., and Ciocalteu, (1943). J. J. (1927).
4. Gottlieb, S., and Marsh, P. B. (1946). Ind. Engng Chem. Anal. Edit., 18, 16.
5. Grifols-Lucas, J. A. (1951). Brit. med..., 2, 295. (Communication to International Congress of Clinicsl Pathology.)