REFERENCES 



343 



87. P. Karrer and A. Notthafft. Helv. chini. Acta 15 (1932) 1195. 



88. P. Karrer and E. Krause-Voith, Helv. chim. Acta 30 (1947) 1772. 



89. J. Tischer, Z. physiol. Chem. 250 (1937) 147. 



90. J. Tischer, Z. physiol. Chem. 252 (1937) 225. 



yi. H. Brockmann and O. Volker, Z. physiol. Chem. 224 (1934) I93- 



92. C. Grundmann and Y. Takeda, Naturwissenschaften 23 (1937) 27. 



93. Y. Takeda and T. Ohia, Z. physiol. Chem. 258 (1939) 6. 



94. Y. Takeda and T. Ohta, Z. physiol. Chem. 26y (1941) 171. 



95. C. F. W. Krukenberg and H. Wagner, Z. Biol. 21 (1885) 25. — Cf. Newbigin, 

 Colour in nature, a study in biology, London 1898 p. 1-344. 



96. H. V. EuLER, H. Hellstrom and M. Malmberg, Svensk Kem. Tidskr. 43 (1933) 151. 



97. A. Emmerie, M. van Eekelen, B. Josephi and L. K. Wolff, Acta. Brev. neerl. 

 Physiol. Pharm. Microbiol. 4 (1934) 139. 



98. H. V. EuLER and co-workers, Z. physiol. Chem. 22S (1934) 77- 



99. H. V. EuLER and co-workers, Z. physiol. Chem. 22 j (1934) 89. 

 100. F. RuBEL, Dissertation, Zurich 1936. 



loi. B. T. ScHEER, /. biol. Chem. 136 (1940) 275. 



102. L. Zechmeister and A. Polgar, /. biol. Chem. 140 (1941) i. 



103. H. H. Strain, W. M. Manning, G. Hardin, Biochem. Bull. 86 (1944) 169. 



104. F. Haxo, Arch. Biochem. 20 (1949) 400. 



