88 



MAPLE-SAP SIRUP. 



of these samples came from small camps where the sap was boiled 

 in unprotected kettles in the open; Nos. 6375 and 6379, however, came 

 from Geauga County, Ohio, where the groves are large and the sirup is 

 manufactured under cleanly conditions. As a whole the results do 

 not vary much from the average figure of 5.39 per cent. 



Per cent of phosphoric acid divided by per cent of lime. The average 

 figure for this ratio is 24, the extremes being 64 and 4; the higher 

 figures result when the percentage of phosphoric acid is abnormally 

 high and the low figure when it is very low. Comparing these data 

 with those obtained for the sap ash, a striking similarity is shown, 

 only one having a very high ratio, namely, 73. 



Sulphates. The average figure for sulphates (SO 3 ) is 1.59 per cent 

 with extremes of 6.18 per cent and zero. In seven samples no pre- 

 cipitate occurred with barium chlorid; in six samples the per cent 

 of sulphates was much higher than the average, Indiana samples Nos. 

 6244 and 6396 averaging 5.31 and 4.19 per cent, respectively; New 

 Hampshire sample No. 6683, 6.18 per cent; New York No. 6629, 

 3.27 per cent, while Pennsylvania samples Nos. 6837 and 6842 had 

 3.59 and 3.83 per cent, respectively. The first three noted are 

 abnormally high and were obtained from small camps where not much 

 care was taken in the manufacture. 



Sulphates divided ~by calcium oxid. The average figure for this 

 ratio is 7; the extremes are zero and 30. In 21 cases this figure is 

 10 or more. 



Sulphates divided by potassium oxid. The average figure for this 

 ratio is 4, with extremes of zero and 16. In only three cases is the 

 number over 10. 



The data obtained in this work corroborated those obtained in 

 other similar investigations, as is shown in the following table : 



Compiled data on the mineral constituents of the ash of maple sirup. 

 [Parts per 100 parts of ash.] 



a Vermont Agr. Exper. Sta. Kept., 18: 331. 

 &J. Amer. Chem. Soc. 1904, 26: 1541. 



