REFERENCES 217 



105. R. WiLLSTATTER and W. MiEG, Ann. 355 (1907) i. 



106. L. Zechmeister and P. Tuzson, Ber. 61 (1928) 2003. 



107. R. PuMMERER and L. Rebmann, Ber. 61 (1928) 1099. 



108. P. Karrer, a. Helfenstein and H. Wehrli, Helv. chim. Acta 13 (1930) 87. 



109. P. Karrer and co-workers, Helv. chim. Acta 13 (1930) 709, 1099, 1102. 

 no. P. Karrer and co-workers, Helv. chim. Acta 13 (1930) 1103. 



111. P. Karrer, A. Zubrys and R. More, Helv. chim. Acta 16 (1933) 977. 



112. P. Karrer and co-workers, Helv. chim. Acta 14 (1931) 631. 



113. P. Karrer and co-workers, Helv. chim. Acta 13 (1930) 270, 1094. 



114. R. NiLssoN, and P. Karrer, Helv. chim. Acta 14 (1931) 843. 



115. P. Karrer, H. Koenig and U. Solmssen, Helv. chim. Acta 21 (1938) 445. 



116. L. Zechmeister and P. Tuzson, Ber. 6g (1936) 1878. 



117. For quantitative extinctions measurements see R. Kuhn and A. Smakula, Z. 

 physiol. Chem. igj (1931) 163; K. W. Hausser and A. Smakula, Z. angew. Chem. 

 4j (1934) 663; 48 (1935) 152; K. W. Hausser, Z. Techn. Phys. 15 (1934) i3- For 

 X-ray diffration pattern see G. Mackinney, /. Am. Chem. Soc. 56 (1934) 4^8. 



118. R. Kuhn and H. Brockmann, Z. physiol. Chem. 206 (1932) 43. 



119. H. V. EuLER, P. Karrer and A. Zubrys, Helv. chim. Acta ly (1934) 24. 



120. L. Zechmeister and P. Tuzson, Ber. 61 (1928) 2003; Ber. 62 (1929) 2226. 



121. P. Karrer and S. Ishikawa, Helv. chim. Acta 13 (1930) 709, 1099. 



122. R. WiLLSTATTER and H. H. Escher, Z. physiol. Chem. 64 (1910) 47. — H. Escher, 

 Dissertation, 1909 Zurich. 



123. L. Zechmeister and P. Tuzson, Ber. 62 (1929) 2226. 



124. R. PuMMERER, L. Rebmann and W. Reindel, Ber. 62 (1929) 1411. 



125. R. WiLLSTATTER and W. MiEG, Ann. 355 (1907) i. 



126. P. Karrer and O. Walker, Helv. chim. Acta ly (1934) 43. 



127. P. Karrer and S. Ishikawa, Helv. chim. Acta 13 (1930) 709, 1099. 



128. R. Kuhn and A. Winterstein, Naturwissenschaften 18 (1930) 754. — R. Kuhn, E. 

 Lederer, a. Winterstein, Z. physiol. Chem. igy (1931) 147, 150. 



129. P. Karrer and S. Ishikawa, Helv. chim. Acta 13 (1930) 1099. 



130. R. Kuhn and H. Brockmann, Z. physiol. Chem. 206 (1932) 43. 



131. P. Karrer and S. Ishikawa, Helv. chim. Acta 13 (1930) 713. 



132. P. Karrer and B. Jirgensons, Helv. chim. Acta 13 (1930) 1103. 



133. P. Karrer, H. Koenig and U. Solmssen, Helv. chim. Acta 21 (1938) 445. 



134. L. Zechmeister and P. Tuzson, Ber. 6g (1936) 1878. — ■ P. Karrer and co-workers, 

 Helv. chim. Acta 20 (1937) 682. 1020. 



135. .P. Karrer and E. Jucker, Helv. chim. Acta 28 (1945) 300. 



135a. P. Karrer, E. Krause-Voith and K. Steinlin, Helv. chim. Acta 31 (1948) 113. 



136. D. Hey, Biochem. J. 31 (1937) 532- 



137. P. Karrer and J. Rutschmann, Helv. chim. Acta 28 (1945) 1526. 



138. R. Kuhn and H. Brockmann, Z. physiol. Chem. 213 (1932) 192. 



139. P. Karrer and J. Rutschmann, Helv. chim. Acta 25 (1942) 1144. 



140. P. Karrer and E. Jucker, Helv. chim. Acta 28 (1945) 300. 



141. P. Karrer, E. Jucker and J. Rutschmann, Helv. chim. Acta 28 (1945) 1156. 



142. P. Karrer and J. Rutschmann, Helv. chim. Acta 25 (1942) 1144. 



143. P. Karrer and E. Jucker, Helv. chim. Acta 26 (1943) 626. 



144. P. Karrer and E. Jucker, Helv. chim. Acta 27 (1944) 1585. 



145. P. Karrer and E. Jucker, Helv. chim. Acta 28 (1945) 300. 



146. P. Karrer and E. Jucker, Helv. chim. Acta 26 (1943) 626. 



147. P. Karrer and E. Jucker, Helv. chim. Acta 27 (1944) 1585. 



148. P. Karrer and E. Jucker, Helv. chim. Acta 28 (1945) 300. 

 T49. P. Karrer and E. Jucker, Helv. chim. Acta 27 (1944) 1585. 



150. P. Karrer, E. Jucker and J. Rutschmann, Helv. chim. Acta 28 (1945) 1156. 



151. L. Zechmeister and L. v. Cholnoky, Ber. 69 (1936) 422. 



