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29. Glover, M., Morton, R. A., and Rosen, G. D. (1951), Biochem. J., 50, 425. 



30. Walls, G. L., and Judd, H. D. (1933), Brit. jf. Ophthalmol., 17, 641. 



31. Drummond, y. C, and MacWalter, R. J. (^1935), Jf. exp. Biol, 12, 105. 



32. Barua, R. K., and Morton, R. A. (1949). Unpublished observations. 



33. Wagner, K, H., and Vermeulen, M. (1939), Erndhrung, 4, 193. 



34. Jensen, H. B., and With, T. K. (1939), Biochem. Jf., 33, 1771. 



35. Marcussen, E. (1943), Dansk. Tids. Farm., 17, 73. 



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37. Fox, D. L. (1937), Proc. Nat. Acad. Sci., Washington, 23, 295. 



38. Fox, D, L., and Anderson, L. J. (1941), Proc. Nat. Acad. Sci., 27, 335. 



39. Fox, D. L., Updegraff, D. M., and Novelli, G. D. (1944), Arch. Biochem., 5, 1. 



40. SCHEER, B. T. (1940), Jf. biol. Chem., 136, 275. 



41. KOE, B. K., Fox, D. L., and Zechmeister, L. (1950), Arch. Biochem., 27, 449. 



42. Petracek, F. J., Fox, D. L., and ZECHMEISTER, L. (1951), Arch. Biochem., 30, 466. 



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