[SNELL] ANALYSIS OF MAPLE PRODUCTS 173 



I infer from these results that the difference between the two 

 methods of washing is of little consequence. 



As intimated above the syrups upon which the determination of 

 the conductivity of the ash was made are peculiar in their low ratio of 

 alkalinity of soluble to that of insoluble ash. They average '54. On 

 the 47 syrups examined by Jones the average value of this ratio is -98; 

 on the 13 upon which Hortvet made these determinations it is «91; 

 Bryan's general average for 481 syrups is -81, although for the 100 

 syrups selected by him for ash analysis, I find the average to be -87; 

 and the average for the 12 sryups of Tables IV and VII of the present 

 paper is 1 • 05. It is clear, therefore, that the syrups made in the labora- 

 tory (Tables III and VI), are of exceptional character. Under these 

 conditions I do not feel justified in drawing any conclusions from the 

 results obtained in the determination of the electrical conductivity 

 of the ash solution. This property is, however, worthy of further 

 study. 



The Conductivity Values of non-maple Syrups. 



Table VIII gives the conductivity values of a number of non-maple 

 syrups. It will be seen that syrup made from granulated sugar is 

 practically a non-conductor, that syrups from partially refined cane 

 sugar may give values within the limits found for pure maple syrups, 

 and that all of the others give conductivity values distinctly above the 

 limits for maple. It is clear, therefore, that values either above or 

 below the limits for genuine maple syrup may be produced by adultera- 

 tion. Syrups yielding values either abnormally high or abnormally 

 low may be condemned without further examination. But it is clear 

 that the possession of a normal conductivity value is not in itself ade- 

 quate evidence of the purity of a syrup. 



Usefulness of the Method. 



In Table IX are given the results of analysis of 34 syrups as found 

 upon the market in the Provinces of Saskatcheman, Alberta and British 

 Columbia in 1911 and 1912. The modified Winton lead number was 

 determined upon the quantity of syrup containing 25 grams of dry 

 matter. 



It will be seen that the conductivity method would condemn 15 of 

 these samples, and that every one of these 15 is also condemned by a 

 complete analysis. Syrups 32 and 34, however, which would pass 

 the conductivity test, are condemned by the other determinations, 

 and Nos. 3, 4 and 29 which are near the limit in conductivity value 

 and which, being of the same brand as Nos. 9, 19, 21, 22, 24 and 28, 



