CANE SUGAR. 



4. When the stalks are developed, the accumulated invert sugar is con- 

 verted to sucrose ; of the invert sugar remaining the dextrose is generally in 

 excess. 



5. When the stalks are ripe the leaves die and the accumulation of sugar 

 gradually ceases; the remainder of the invert sugar is changed to sucrose, 

 eventually only traces of invert sugar remaining. 



6. When the stalks are over-ripe the sucrose is converted into invert 

 sugar, but this change does not prevent the younger parts of the cane 

 accumulating sugar. 



The roots of the cane only contain sugar when very young ; as the age of 

 the cane increases the sugar is converted into starch and cellulose. 



Starch has been recognised in cane leaves cut in the day time. 



REFERENCES IN CHAPTER I. 



1. The True Grasses, p. 15. 



2. Das Zuckerrohr, pp. 5-24. 



3. Quoted by Delteil in Le Canne a Sucre, p. 14. 



4. /. S. J., 45. 



5. Stubbs' Sugar Cane, p. 13. 



6. Quoted by Lock and Newlands in Sugar. 



7. Arch. IV., 525. 



The blocks whence Figs. 2-6 were printed have been lent by the Experiment 

 Station of the Hawaiian Sugar Planters' Association. They have previously 

 appeared in the Bulletins issued by the H.S.P.A. Experiment Station; the original 

 drawings were made by Mr. E. M. Grosse, Mr. W. E. Chambers, and Miss Frieda 

 Cobb, under the direction of Dr. N. A. Cobb. 



12 



