to 2.5, but the results obtained on the mixtures are proportional and 

 more dependence can be placed on a fractional part of a higher con- 

 stant. The modified lead number was determined on ten authentic 

 samples a of maple sirup and also on each sample after adding 50 per 

 cent, by weight, of a cane sugar sirup (66 per cent sucrose content) 

 with the following results : 



Modified lead numbers on authentic samples and mixtures containing 50 per cent of cane 



sugar sirup. 



In this work the effect of the addition of cane sirup or brown sugar 

 sirup, which is very pronounced, has not been considered, only the 

 determination of the maple content of sirups made by the admixture 

 of cane sugar sirup. The points which the writer wishes to emphasize 

 are the use of an unfiltered or acidified blank when following the 

 original Winton method and the advantage of the proposed modified 

 method in that it affords proportionate results on mixtures. 



Samples furnished by A. H. Bryan, Sugar Laboratory, Bureau of Chemistry. 

 [Cir. 53] 



o 



