174 THE ROYAL SOCIETY OF CANADA 



are probably adulterated, are also near the limits of the Canadian 

 standard in respect to the other analytical data and are below the 

 Vermont standard in total ash. When one considers that all the ordin- 

 ary analytical work on the 15 samples might be omitted, the usefulness 

 of the conductivity method is apparent. 



Summary. 



1. A rapid method of detecting adulteration of maple syrup 

 with commercially pure sucrose is described. 



2. The "conductivity value" is defined as 100,000 times the 

 specific conductivity at 25°C. of a mixture of one volume syrup with 

 two volumes water. 



3. The limits of conductivity value for pure maple syrup are tenta- 

 tively set at 110 to 200. 



4. The relation of conductivity value to ash data is discussed. 



5. The usefulness of the test is illustrated. 



