47<> Bulletin 167 



three items, the total ash ranging- from 0.06% to 0.13%, the in- 

 soluble ash from 0.01% to 0.03% and malic acid value from 

 0.01% to 0.16% below standard requirements. 



Explanatory of the deficiencies enumerated above, atten- 

 tion is now called to a procedure that was employed on 11 of the 

 samples reported in table 36, in which are listed the samples 

 below standard in any particular, and which, fortunately, included 

 5 of those now being considered. These 11 samples were 

 selected at random before the previous compilations had been 

 made and their choice, at that time, depended on the size of the 

 sample available, together with the concentration as indicated 

 by the moisture content. 



The treatment to which they were submitted is known as the 

 "boiling and filtering process" first suggested by tbe writer in 

 1905. L This, as was then pointed out, is an important procedure 

 in the certain determination of the purity of a maple product. 

 Suitable portions of water were added and the samples con- 

 taining both sirup and precipitated "niter" were mixed, heated 

 in a water bath at 65 to 75 ° C. for an hour, and allowed to settle 

 for two days. A portion was then decanted and boiled in a 

 beaker, until a thermometer inserted in the sirup indicated 104 

 C. The sirup was immediately filtered hot through double filter 

 papers and the ash and malic acid value determined on the clear 

 filtrate. The results obtained by this procedure are given in the 

 following table together with tbose originally secured on the 

 concentrated and clarified samples. 



1 Vt. Sta. Rpt. IS, p. 328 (1905). 



