94 



MAPLE-SAP SIRUP. 



The composition and color of maple sirup as affected by runs Continued. 



COMPARISON OF SIRUP MADE FROM FIRST AND LAST RUNS OF SAP. 



The preceding tabulation has been prepared from the data given 

 in the detailed table on page 67. The serial number of the sample 

 and the State from which it came are given so that the samples may 

 be identified and the other data compared. The points covered in 

 this table are color, total ash, insoluble ash, basic lead number, and 

 the Cowles malic acid value. The two samples on the same line, 

 reading across the page, are from the same maker. The first part of 

 the table is a comparison of sirup made from first runs of sap and 

 from middle season runs. Considering the averages, the color of the 

 middle run sirup is one number darker than the first, increasing from 

 7 to 8. The ash has increased only 0.04 per cent and the insoluble 

 ash has increased practically the same amount, namely, 0.05 per 

 cent. This figure would seem to indicate the presence of a little 

 more lime salts or malate of lime. The lead numbers show an in- 

 crease of 0.03 per cent and the malic acid value 0.07 per cent. As a 

 whole, the increases are rather small, as would be expected. 



Considering the second section of the table, namely, the comparison 

 of sirups from middle runs and from last runs, another increase of 

 one point in color is found, namely, from 8 to 9. The total ash shows 

 an increase of 0.27 per cent and the insoluble ash a gain of only 0.11 

 per cent. This again indicates more lime salts in the sirup of the 

 last runs. The lead number has risen from 2.35 to 3.19, an increase 

 of 0.84 and the malic-acid value shows a gain of 0.1 1 . In every deter- 



