4f.fi Bulletin i6y 



Calculated to a moisture-free basis 



Average, 



Average above 34% water, 84 



Average below 34% water, 42 



Average below 30% water, 25 



A gradual drop in tiie total and insoluble ash contents and 

 in malic acid value occurs as the concentration increases. If 

 averages show this condition, it is to he expected that the individ- 

 ual samples, which, in the instances under consideration, rep- 

 resent the sap from but a few trees and not a composite from 

 the orchard, would show similar variations, some of which must 

 of necessity be below the standard of comparison, which, of 

 course, is based on commercial samples and not on such extreme 

 conditions as obtained in this investigation. 



In judging the purity of maple sirup, it is essential that the 

 analyst should clearly understand the nature and significance of 

 the data secured. The standard under consideration includes 

 the total and insoluble ash contents and the malic acid value. 

 They represent inorganic and organic constituents respectively. 

 The slight departure of any one constituent from the standard 

 should not in itself be interpreted too strictly, particularly if 

 it be the total ash or malic acid value. 



The number of samples below the standard, and the average, 

 maximum and minimum deficiencies are stated in the following 

 table. 





