482 SOEGHUM. 



There was also made a series of analyses of solutions of known 

 quantities of commercial cane sugar and of anhydrous glucose, both 

 separate and mixed. 



The results of these analyses are given in the following table. They 

 show clearly the substantial accuracy of the analytical methods em- 

 ployed in the work which has been recorded ; but it is interesting to 

 observe that, while the specific gravity, polarization, and analytical 

 results for each constituent agree very closely in the duplicate analyses 

 made, there is found, as the aggregate of four of the analyses where 

 sucrose alone was taken, as follows : 



Grams. 



Sucrose taken ]7 03 



Sucrose found 17 .58 



Also, in those four cases where there was taken anhydrous glucose, 

 the following results were obtained in the aggregate : 



Grams. 



Glucose taken 17 12 



Glucose found 17.11 



But in these cases, eight in all, in which both sucrose and glucose 

 were present in the solutions analyzed, the aggregate results were as 

 follows : 



It will be seen that, while the amount of glucose taken is approxi- 

 mately equal to that found, as in the case of analyzing the solution of 

 glucose alone, still the amount of sucrose found is 10.4 percent greater 

 than the amount taken. This result is, in all probability, due to the 

 fact, that there existed as impurity, in the anhydrous glucose taken, a 

 certain quantity of some product intermediate between starch and 

 glucose, which, while not reducing the Fehling solution in the estima- 

 tion of the glucose, was converted into glucose by treatment with acid 

 in the estimation of the sucrose : 



