REFERENCES 65 



4. P. Karrer, F. Benz and M. Stoll, Helv. Chim. Acta 16 (1933) 297. 



5. P. Karrer and U. Solmssen, Helv. Chim. Acta 18 (1935) 477. 



6. R. KuHN and C. Grundmann, Ber. 65 (1932) 898, 1880. 



7. P. Karrer and E. Jucker, Helv. Chim. Acta 30 (1947) 266. 



8. P. Karrer and E. Jucker and co-workers, Helv. Chim. Acta 28 (1945) 300, 427, 471, 

 474, 717, 1143, 1146, 1156; 30 (1947) 531. 



9. R. Pummerer and co-workers, Ber. 61 (1928) 1099; 62 (1929) 141 1. 



10. H. V. Euler, p. Karrer and O. Walker, Helv. Chim. Acta 15 (1932) 1507. 



11. P. Karrer and E. Jucker, Helv. Chim. Acta 28 (1945) 427. 



12. P. Karrer and E. Jucker and co-workers, Helv. Chim,. Acta 28 (1945) 300, 427, 471, 

 474, 717, 1143. 1146, 1156; 30 (1947) 531. 



13. P. Karrer, Helv. Chim. Acta 28 (1945) 474. 



14. P. Karrer and E. Jucker, Helv. Chim. Acta 28 (1945) 300. 



15. P. Karrer, E. Jucker and K. Steinlin, Helv. Chim. Acta 28 (1945) 233. 



16. P. Karrer and E. Jucker, Helv. Chim. Acta 28 (1945) 300. 



17. P. Karrer and E. Jucker, Helv. Chim. Acta 2g (1946) 1539. 



Carotenoids 5 



