13 



given, but these are decidedly low as compared with maple prod- 

 ucts. Were the lead number determined on these samples, the low- 

 ness of the figures would be very noticeable. Hence the value of 

 the lead number and the solubility of the ash in determining adul- 

 teration can be seen. 



Adulteration with commercial glucose is readily recognized by the 

 high direct polarization and the strong plus reading of the inverted 

 solution at 87. A reading of 2 or 3 to the right at 87 C. on 

 the inverted solution would hardly indicate glucose, as at 87 there 

 is liable to be a destruction of levulose. Hence great care should 

 be exercised in making readings at that temperature, and the solu- 

 tion should be brought quickly to 87 and a series of readings made 

 without delay. Again, the sample may have fermented, and this 

 would influence the results, possibly to the extent of causing a small 

 plus reading. However, the greatest difference would be noted in 

 the sucrose content and amount of reducing sugar present, and 

 therefore it is necessary to use precautions against fermentation, as 

 the analytical results from such a sample are of little value. 



[Cir. 40] 



o 



