ASSAY METHODS 73 



21. Schultz, A. S., Atkin, L., and Frey, C. N., Ind. Eng. Chcm., Anal. Ed., 14, 



35-9 (1942). 



22. Atkin, L., Schultz, A. S., and Frey, C. N., J. Biol. Chcm., 129, 471 (1939). 



23. Frey, C. N., and Hennessy, D. J., Cereal Chemists Bull., 2, 233 (1942). 



24. Eppright, M. A., and Williams, R. J., Ind. Eng. Chem., Anal. Ed., 16, 576-9 



(1944). 



25. Williams, R. J., and Roehm, R. R., J. Biol. Chem., 87, 581-90 (1930). 



26. Williams, R. J., McMahan, J. R., and Eakin, R. E., Univ. Texas Pub., 4137, 



31-5 (1941). 



27. Cheldelin, V. H., el al., Univ. Texas Pub., 4237, 15-36 (1942). 



28. Schopfer, W. H., Z. Vitaminforschung, 4, 67, 187 (1935). 



29. Meiklejohn, A. P., Biochem. J., 31, 1441-51 (1937). 



30. Sinclair, H. M., Biochem. J., 32, 2185-99 (1938). 



31. Sinclair, H. M., Biochem. J., 33, 2027-36 (1939). 



32. Niven, C. F., and Smiley, K. L., J. Biol. Chem., 150, 1-9 (1943). 



33. Sarett, H. P., and Cheldelin, V. H., J. Biol. Chem., 155, 153-60 (1944). 



34. Sarett, H. P., and Cheldelin, V. H., J. Nutrition, 30, 25-30 (1945). 



35. "Pharmacopoeia of the United States of America," 13th Revision, Mack 



Printing Co., Easton, Pa., 1947, p. 703. 



36. Smith, M. I., U. S. Pub. Health Repts., 45, 116-29 (1930"). 



37. Birch, T. W., and Harris, L. J., Biochem. J., 28, 602-21 (1934). 



38. Chase, E. F., and Sherman, H. C, J. Am. Chem. Soc, 53, 3506-10 (1931). 



39. Cowgill, G. R., "The Vitamin B Requirements of Man," Yale Univ. Press, 



New Haven, Conn., 1934, p. 33. 



40. Arnold, A., and Elvehjem, C. A., /. Nutrition, 15, 403-10 (1938). 



41. Jukes, T. H., and Heitman, H., J. Nutrition, 19, 21-30 (1940). 



42. Passmore, R., Peters, R. A., and Sinclair, H. M., Biochem. J., 27, 842-50 (1933). 



43. Scott, M. L., et al, J. Biol. Chem., 165, 65-71 (1946). 



44. Daniel, L., and Norris, L. C, Food Research, 9, 312-8 (1944). 



45. Daniel, L., and Norris, L. C, J. Nutrition, 30, 31-6 (1945). 



46. The Association of Vitamin Chemists, Inc., "Methods of Vitamin Assay," 



Interscience Publishers, New York, N. Y., 1947, pp. 102-110. 



47. Snell, E. E., and Strong, F. M., Ind. Eng. Chem., Anal. Ed., 11, 346-50 (1939. 



48. "Pharmacopoeia of the United States of America," 13th Revision, Mack Print- 



ing Co., Easton, Pa., 1947, p. 685. 



49. Feeney, R. E., and Strong, F. M., J. Biol. Chem., 133, xxxi (1940). 



50. Roberts, E. C, and Snell, E. E., J. Biol. Chem., 163, 499-509 (1946). 



51. Bauernfeind, J. C, Sotier, A. L., and Boruff, C. S., Ind. Eng. Chem., Anal. Ed., 



14, 666-71 (1942). 



52. Strong, F. M., and Carpenter, L. E., hid. Eng. Chem., Anal. Ed., 14, 909-13 



(1942). 



53. Kodicek, E., and Worden, A. N., Biochem. J., 39, 78-85 (1945). 



54. Isbell, H., Wooley, J. G., and Fraser, H. F., U.S. Pub. Health Repts., 56, 282-5 



(1941). 



55. Williams, R. J., McAlister, E. D., and Roehm, R. R., J. Biol. Chem., 83, 315-20 



(1929). 



56. Bourquin, A., and Sherman, H. C, J. Am. Chem. Soc, 53, 3501-5 (1931). 



57. El Sadr, M. M., Macrae, T. F., and Work, C. E., Biochem. J., 34, 601-7 (1940). 



58. Wagner, J. R., et al., J. Biol. Chem., 136, 357-64 (1940). 



59. Emmett, A. D., et al, Ind. Eng. Chem., Anal. Ed., 13, 219-21 (1941). 



60. Wilgus, H. S., Norris, L. C, and Heuser, G. F., J. Agri. Research, 51, 383-99 



(1935) 



61. Heiman, V., and Carver, J. S., Poultry Sci., 16, 434-7 (1937). 



62. Jukes, T. H., J. Nutrition, 14, 223-33 (1937). 



63. Konig, J., Prakt. Chem., 70, 19 (1904). 



64. Harris, L. J., and Raymond, W. D., Biochem. J., 33, 2037-51 (1939). 



