ACKNOWLEDGEMENTS 



We wish to express our thanks to Dr. R. R. Williams and to our former 

 colleague Professor E. E. Snell for critically reading substantial portions 

 of the manuscript. We also acknowledge gratefully the help and en- 

 couragement received from all of the members of the Biochemical Insti- 

 tute staff. Individual members have read portions of the manuscript, 

 helped in its final preparation and aided in numerous ways to make the 

 book possible. To all of these we express our sincere gratitude and thanks. 



Permission to use the following material is acknowledged with thanks: 

 Table 2, pp. 250-251, Table 3, p. 253 and Table 4, p. 253, from Williams 

 and Spies: Vitamin B t and Its Use In Medicine, copyright 1938, by the 

 Macmillan Company. Table 6, p. 257, Journal of Nutrition, L. J. Roberts, 

 Figure 3, p. 313, Indian Journal of Medical Research, P. S. Sarma. Table 

 20, pp. 324-325, Food and Nutrition Board, National Research Council. 

 Tables 29 and 30, pp. 366-367, Academic Press, C. W. Denko. Table 34, 

 p. 389, Proceedings of the Society for Experimental Biology and Medi- 

 cine, F. G. Brazda. Figure 17, p. 405, Journal of Nutrition, J. Salcedo, Jr. 

 and L. E. Holt, Jr. Figures 18-20, pp. 416-418, Lancet, T. D. Spies. 



