REFERENCES 



19 



27. B. Ahmad and K. Malik, Indian J. Med. Research 20 (1933) 1033. 



28. H. Brockmann and M.-L. Tecklenburg, Z. physiol. Chem. 221 (1933) 117. 



29. Idem, ibid., see also H. Rosenberg, Chemistry and Physiology of the Vitamins, New 

 York 1945, p. 55. 



30. Th. Moore, Biochem. J. 25 (1931) 2131. 



31. Th. Moore, Biochem. J. 26 (1932) i. 



32. A. J. CooMBES, G. L. Ott and W. Wisnicky, North. Am. Veterinarian 21 (1940) 601. 



33. H. Rosenberg, cf. ref. 30. 



34. N. S. Capper, JM. W. McKibbin, J. H. Prentice, Biochem. J. 25 (1931) 265. 



35. H. Rosenberg, Chemistry and Physiology of the Vitamins, p. 50, 73, New York 1945. 



36. R. A. Morton and R. H. Creed, Biochem. J. 33 (1939) 318. 



37. P. Karrer, H. v. Euler and U. Solmssen, Helv. Chim. Acta ly (1934) 1169. 



38. P. Karrer and co-workers, Helv. Chim. Acta 15 (1932) 878; 17 (1934) 3. 

 49. L. Zechmeister and co-workers, Arch. Biochem. 5 (1944) 107; 7 (1945) 247. 



40. H. V. Euler, Helv. Chim. Acta 28 (1945) 1150. 



41. Cf. the review by P. Karrer, Dociimenta Ophthalmologica, 1938, p. 259. 



42. F. Boll, Arch. Anat. Physiol. Anat. Abt. 1877, 4. 



43. Blegvad, Dissertation, Kopenhagen, 1923. 



44. Block, 7. Dairy Sci. U.S.A. 7 (1924) i. 



45. Fridericia and Holm, Am. J. Physiol. 73 {1925) 63. 



46. H. V. Euler and E. Adler, Arkiv. Kemi Mineral. Geol. B 11 (1933), Nr. 20, 21. 



47. G. Wald, Nature 132 (1933) 316; 134 (1934) 65; /. Gen. Physiol. 18 (1934) 905- 



48. G. Wald, /. Gen. Physiol, jg {1935) 351. 



49. G. Wald and H. Zussman, Nature 140 (1937) i97- 



50. HoNiGMANN, Arch. Ges. Physiol. 189 (1921) i. Cf. G. Wald, Nature 140 (1937) 545- 



51. G. Wald, /. Gen. Physiol, ig (1935) 351. 



52. G. Wald, /. Gen. Physiol. 21 (1937) 93. •* 



53. G. Wald, Nature 136 (1935) 9i3- 



54. E. Kottgen and C. Abelsdorff, Z. Psychol. Physiol. Sinnesorgane 12 (1896) 161. 



55. G. Wald, Nature 139 (1937) 1017. 



56. S. Ball, T. W. Goodwin and R. A. Morton, Biochem. J. 40 (1946) Proceed. LIX. — 

 R. A. Morton, Nature, London 153 (1944) 69. — R. A. Morton and T. W. Goodwin, 

 Nature, London, 153 (1944) 405. — S. Ball, T. W. Goodwin and R. A. Morton, 

 Biochem. J. 42 (1948) 516. 



