18 CHAPTER II 



Other Constituents. Other constituents present in very small quantities 

 but of technical importance are colouring matters, of which chlorophyll, 

 anthocyan, the blue or red pigment in coloured canes, and saccharetin are 

 the chief. Amongst these should also be included the tannins or polyphenols, 

 mainly resident in the tops and eyes ; these were first observed by Szyman- 

 ski, 22 and have since been studied by Narain 23 and Zerban 24 . The latter 

 finds that the cane tannin or polyphenol is a derivative of pyrocatechin 

 allied to the oak tannins, and to be placed in Class la of Proctor's classi- 

 fication. 25 



Various enzymes are also known to exist in the cane. Browne 2 found 

 an invertase mainly resident in the tops, and Raciborski 26 identified a laccase 

 and peroxidase, to which Zerban 27 has added a tyrosinase. 



REFERENCES IN CHAPTER II 



1. H.S.P.A. Ex, Sta., Agric. Ser., Bull. 9. 



2. La. Ex. Sta., Bull. 91 



3. Ann. Chim. Phys., 1844, u, 39. 



4. Memoires de 1'Academie des Sciences, 1850, 22, 509 



5. Quoted from Experiment Station and Government publications 



6. Java Arch., 1896, 4, 525. 



7. In " Cultur de la Canne a Sucre." 



8. Stubbs' " Sugar Cane." 



9. S. C., 1897, 29, 207. 



10. S. C., 1889, 21, 484 



11. Jour. Am. Chem, Soc., 1897, 19, 881 ; 1898, 20, 113 ; 1899, 21, 809. 



12. International Congress of Applied Chemistry, 1912 



13. Z. fUr Chem., 1870, 6, 329. 



14. Phil. Mag., 1845, 27, 533. 



15. Java Arch., 1894, 2 TI 3- 



16. 5. C., 1894, 26, 622. 



17. Jour. Ind. Eng. Chem., 1912, 3, 643. 



18. S. C,, 1894, 26, 67. 



19. Proc. Am. Chem. Soc., 1876, i, 220. 



20. Ann. Chim. Phys., 1840, 75, 214. 



21. Jour. Soc. Chem. Ind., 1912, 28, 991, 



22. Berichte des Vereins Station fur Zuckerrohr in West Java 2 13 



23. Agric. Jour, of India, 1918. Science Congress issue. 



24. Jour. Ind. Eng. Chem., 1919, u, 1034. 



25. Jour. Soc. Chem. Ind., 1894, 13, 487. 



26. Java Arch., 1906, 14, 857. 



27. La. Plant., 1919, 61, 299; 



