I70 CAROTENOID HYDROCARBONS OF KNOWN CONSTITUTION X 



176. P. Karrer, E. Jucker, J. RuTSCHMANN and K. Steinlin, Helv. chim. Acta 28 

 (1945) 1150. 



177. A. PolgAr and L. Zechmeister, /. Am. Chem. Soc. 65 (1943) 1528. 



178. R. KuHN and H. Brockmann, Naiurwissenschaften 21 (1933) 44; Ber. 66 (1933) 407. 



179. R. KuHN and H. Brockmann, Ber. 66 (1933) 407- 



180. A. Winterstein, Z. physiol. Chem. 2ig (1933) 249. 



181. R. KuHN and H. Brockmann, Ber. 66 (1933) 407. 



182. Cf. communication of L. Zechmeister and W. A. Schroeder, Arch. Biochem. i 

 (1942) 231. 



183. R. KuHN and H. Brockmann, Ber. 66 (1933) 407. 



184. H. WiLLSTAEDT, Chem. Cenir. 1935, II, 707. 



185. A. Winterstein, Z. physiol. Chem. 215 (1933) 55. — R. Kuhn and H. Brockmann, 

 Chem. Centr. 1933, II, 1205; Z. physiol. Chem. 221 (1933) 131. — H. Brockmann 

 and M. L. Tecklenburg, Z. physiol. Chem. 221 (1933) 117. 



186. R. Emerson and D. L. Fox, Proc. Roy. Soc. (London) (B) 128 (1940) 275. — P. 

 Karrer and co-workers, Helv. chim. Acta 26 (1943) 2 121. 



187. L. Zechmeister and A. PolgAr, /. Am. Chem. Soc. 6y (1945) 108. 



188. L. Zechmeister and co-workers. Arch. Biochem. 5 (1944) 365. 



189. L. Zechmeister and W. A. Schroeder, Science 94 (1941) 609. — Cf. /. Am. Chem. 

 Soc. 64 (1942) 1 173. 



190. L. Zechmeister and W. A. Schroeder, /. biol. Chem. 144 (1942) 315. 



191. L. Zechmeister and R. B. Escue, /. biol. Chem. 144 (1942) 321. 



192. L. Zechmeister and W. A. Schroeder, Arch. Biochem. i (1942) 231. 



193. L. Zechmeister and W. A. Schroeder, /. Am. Chem. Soc. 64 (1942) 1173. 



