65 



OOMI'OSmON OF JUICE IN BLADES AND STALKS. 



Numerous analyses were made 1 to determine the relative coinposi. 

 tion of stalk and leaf juice. This comparison will be sufficiently indi- 

 cated by some of the analyses quoted below : 



Dr. Collier adds the following observation : 2 



It is to be observed that in no case was there any available sugar in the juice from 

 the leaves, owing not to the excess of glucose, but to the much larger percentage of 

 solids not sugars in the leaf juice. 



FURTHER ANALYSES OF FROSTED CANES. 3 



Per cent. 

 Analyses before frost, November 3, 1882. Means : 



Sucrose 12. 44 



Glucose 1.23 



Not sugar 2.68 



Available sugar 8.62 



Juice extracted 58. 19 



Analyses after thirteen frosts, December 8. Means : 



Sucrose 14.35 



Glucose 2. 85 



Not sugar 2. 98 



Juice extracted 39. 17 



Loss of juice 32.69 



Gain in sucrose 15. 35 



Gain in glucose 131. 71 



Loss in available sugar 1. 16 



ANALYSES DURING THE YEAR 1883. 



Numerous analyses were made by the Division of Chemistry of the 

 Department of Agriculture during the season of 1883, under my super 

 vision. 



Considering that it had. been sufficiently well established by the re- 

 searches of Dr. Collier, that small plats of cane under careful cultun- 

 and proper fertilization afforded an extremely rich saccharine plant, I 

 directed attention chiefly to the character of the juice as a whole. The 

 analyses represent the average composition of the juice from 740,350 

 pounds of cane. 1 



1 Op. cit., pp. 29-30. 

 5 Op. cil., p. 30. 



2357G Bull 18 5 



Op. cit., p. 34. 



Bull. No. 3, pp. 43 and 47. 



