10 



Thus, while the content of sucrose in the chip juices for that day was 

 18 per cent, below the average for the season, the sucrose in the diffusion 

 juice was 211 per cent, above it. These numbers show the difficulty of 

 obtaining comparative samples in sorghum examinations. Single anal- 

 yses are apt to be deceptive, and reliance should be placed rather on 

 the work for the entire season. 



TABLE 1S T O. 4. Mill juices from exhausted chips. 



The sucrose in the juice expressed from exhausted chips was inverted 

 and estimated with the reducing sugar present, and the whole expressed 

 as total sugars. 



The ratio of the sucrose in the chips to the reducing sugar shows that 

 the former is more readily diffused than the latter. This ratio was not 

 determined for the whole season. From October 8 to 18, however, 

 seven such analyses were made, with the following results : 



TABLE No. 5. Sucrose and glucose in juice from exhausted chips and corresponding diffu- 

 sion juices. 



Ratio of glucose to sucrose from exhausted chips 1 : 1.95 



Ratio of glucose to sucrose in diffusion j nice 1 : 2. 86 



Ratio of glucose to sucrose corresponding mill juice from fresh chips 1 : 2. 69 



The variations in the quantities of sugar left in the chips were due 

 to differences in the quantity of diffusion juice drawn off at each charge, 

 and to changes in rapidity of working. Rapid working with small 

 quantities of juice drawn off leave more sugar in the chips than slower 

 working and larger charges of diffusion juice. 



