COMBINED FORMS— EXTRACTION 43 



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



ing Co., Easton, Pa., 1947, p. 669. 



54. Steele, H. K., Cereal Chem., 22, 448-54 (1945). 



55. Cheldelin, V. H., and Williams, R. R., Ind. Eng. Chem., Anal. Ed., 14, 671-5 



(1942). 



56. Krehl, W. A., and Strong, F. M., /. Biol. Chem., 156, 1-12 (1944). 



57. Krehl, W. A., Elvehjem, C. A., and Strong, F. M., /. Biol. Chem., 156, 13-19 



(1944). 



58. Kodicek, E., Biochem. J., 34, 712-23 (1940). 



59. Rohrman, E., Burget, G. E., and Williams, R. J., Proc. Soc. Exptl. Biol. Med., 



32, 473-4 (1934). 



60. Williams, R. J., et al, J. Am. Chem. Soc., 60, 2719-23 (1938). 



61. Waisman, H. A., et al., J. Nutrition, 23, 239-48 (1942). 



62. Willerton, E., and Cromwell, H. W., Ind. Eng. Chem., Anal. Ed., 14, 603-4 



(1942). 



63. Neilands, J. B., and Strong, F. M., Arch. Biochem., 19, 287-91 (1948). 



64. Williams, R. J., "The Biological Action of the Vitamins," Univ. Chicago Press, 



Chicago, 111., 1942, p. 122. 



65. Sarett, H. P., and Cheldelin, V. H., /. Biol. Chem., 159, 311-9 (1945). 



66. Lipmann, F., et al, J. Biol. Chem., 167, 869-70 (1947). 



67. Snell, E. E., Guirard, B. M., and Williams, R. J., J. Biol. Chem., 143, 519-30 



(1942). 



68. Snell, E. E., "Annual Review of Biochemistry," Vol. XV, Stanford Univ. Press, 



Stanford University, California, 1946, pp. 383-6. 



69. Gunsalus, I. C, Bellamy, W. D., and Umbreit, W. W., /. Biol. Chem., 155, 



685-6 (1944). 



70. Schlenk, F., and Snell, E. E., /. Biol. Chem., 157, 425-6 (1945). 



71. Green, D. E., et al, J. Biol. Chem., 161, 559-82 (1945). 



72. Lichstein, H. C, Gunsalus, I. C, and Umbreit, W. W., J. Biol. Chem., 161, 



311-20 (1945). 



73. Oser, B. L., "Annual Review of Biochemistry," Vol. XVII, Stanford Univ. 



Press, Stanford University, Calif., 1948, p. 419. 



74. Rabinowitz, J. C, and Snell, E. E., J. Biol. Chem., 169, 643-50 (1947). 



75. Schlenk, F., and Fisher, A., Arch. Biochem., 12, 69-78 (1947). 



76. Rabinowitz, J. C, and Snell, E. E., J. Biol Chem., 169, 631-42 (1947). 



77. Rubin, S. H., Scheiner, J., and Hirschberg, E., J. Biol. Chem., 167, 599-611 



(1947). 



78. Rabinowitz, J. C, and Snell, E. E., Anal. Chem., 19, 277-80 (1947). 



79. Rabinowitz, J. C, and Snell, E. E, J. Biol Chem., 176, 1157-67 (1948). 



80. Melnick, D., et al, J. Biol. Chem., 160, 1-14 (1945). 



81. Thompson, R. C, Eakin, R. E., and Williams, R. J., Science, 94, 589-90 (1941). 



82. Eakin, R. E., Snell, E. E., and Williams, R. J., /. Biol. Chem., 136, 801-2 



(1940). 



83. Eakin, R. E., Snell, E. E., and Williams, R. J., /. Biol. Chem., 140, 535-43 



(1941). 



84. Pennington, D. E., Snell, E. E., and Eakin, R. E., J. Am. Chem. Soc, 64, 469 



(1942). 



85. Hertz, R., and Sebrell, W. H., Science, 96, 257 (1942). 



86. Schweigert, B. S., et al, J. Nutrition, 26, 65-71 (1943). 



87. Wright, L. D., and Skeggs, H. R., Proc. Soc. Exptl. Biol. Med., 56, 95-8 (1944). 



88. Lampen, J. O. Bahler, G. D., and Peterson, W. H., J. Nutrition, 23, 11-21 (1942). 



89. Posternak, S., Compt. rend., 169, 138-40 (1919). 



90. Anderson, R. J., J. Biol Chem., 18, 441-6 (1914). 



91. Boutwell, P. W., J. Am. Chem. Soc, 39, 491-503 (1917). 



92. Anderson, R. J., J. Biol. Chem., 20, 483-91 (1915). 



93. Anderson, R. J., J. Am. Chem. Soc, 52, 1607-8 (1930). 



