44 



BULLETIN 466,, U. S. DEPARTMENT OF AGRICULTURE. 



content lower than 0.23 per cent and with other figures normal, it 

 seems fair to conclude that a pure maple product should have at 

 least 0.23 per cent insoluble ash or, if it has less, that the other 

 figures should be above the minima. 



Winton lead number. — Much stress is laid upon the Winton lead 

 number in judging a maple product. Among the 481 sap sirups, the 

 lowest number was 1.76, the next being 1.85, the highest 4.41, and 

 the average 2.70. With the maple sugars, the lowest was 1.85, the 

 highest 4.95, and the average 2.76. 



Table XXXI.- 



-Samples of maple products 



with a Winton lead number of 0.85 or lower. 



Serial 

 No. 



Total 

 ash. 



Insoluble 

 ash. 



Winton 



lead 

 number. 



Malic 

 acid 

 value. 



Serial 

 No. 



Total 

 ash. 



Insoluble 

 ash. 



Winton 



lead 

 number. 



Malic 



acid 



value. 



6693 

 6613 

 6577 

 6768 



Per cent. 

 0.97 



.88 

 .80 

 .78 



Per cent. 



0.26 



.23 



.23 



.24 



1.76 

 1.85 

 1.85 

 1.85 



0.31 

 .79 

 .73 

 .80 



6635 



6827 

 6891 

 8344 



Per cent. 

 0.91 



.77 

 .83 

 .78 



Per cent. 



0.27 



.23 



.35 



.21 



1.85 

 1.85 

 1.85 

 1.85 



1.68 

 .72 

 .80 



.59 



The sample with 1.76 was abnormal in this respect, being the only 

 one out of 844, but the other determinations are above the selected 

 minima. The total ash in each case is 0.77 per cent or over, and 

 in only one case, No. 8344, is the insoluble ash content below 0.23 

 per cent. In two cases, however, the malic acid value is below 0.60. 

 Here one sample only out of 844 has a lead number below 1.85, and 

 as this sample is normal in ash and insoluble ash, 1 .85 should be con- 

 sidered the lower limit for such a figure. 



Ross lead number. — This determination was not made in the case 

 of the sap sirups. It was made in 282 of the 283 sugar sirups from 

 the United States and in 26 of the 80 sugar sirups from Canada. Of 

 these 308 samples, only 6 cases were noted in which values of 2.35 or 

 lower were obtained. The lowest value found was 2.20, the highest 

 5.90, and the average 3.50. 



Table XXXII. — Samples of maple sugars with a Ross lead number of 2.35 or lower. 



Serial 



Total 



Insoluble 



Ross lead 



Malic acid 



Serial 



Total 



Insoluble 



Ross lead 



Malic acid 



No. 



ash. 



ash. 



number. 



value. 



No. 



ash. 



ash. 



number. 



value. 





Per cent. 



Per cent. 









Per cent. 



Per cent. 







8344 



0.78 



0.21 



2.20 



0.59 



7560 



0.78 



0.27 



2.31 



0.67 



6373 



.78 



.36 



2.22 



.74 



7512 



.78 



.23 



2.32 



.62 



6374 



.82 



.39 



2.25 



.83 



6617 



.78 



.34 



2.35 



.62 



Of these six samples it is noted that, with the exception of 8344, 

 determinations of other values do not fall below 0.77 total ash, 0.23 

 insoluble ash, and 0.60 malic acid. As, with the exception of 8344, 

 these samples are not found in Table XXXII, it is apparent that the 

 Winton lead value also was not below 1.85. Even in the case of 



