6 BULLETIN 466, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE IV.—Effect of concentration of sirup on ash and malic acid values (Jones). 
Ash. 
: Malic 
Concentration. acid 
Total. | Soluble. | Museu" | value. 
ble. 
— 
Per cent. | Per cent. | Per cent. 
Average of 84 sirups having over 34 per cent water............. 1.02 0. 45 0. 57 1.00 
Average of 42 sirups having from 30 to 34 per cent water.....-.-- - 80 -48 -32 -71 
Average of 25 sirups having less than 30 per cent water.......-.- 77 -49 . 28 - 66 
1 Vt. Agr. Exp. Sta. Bul. 167, p. 466. 
It is necessary, then, to use care not to concentrate a sample of sirup 
made from the sugar under examination beyond a certain point, as 
there might be a precipitation of material which would cause the 
analyst to believe the sample was adulterated. The data contained 
in Table V show the likelihood of such an occurrence. 
TaBLE V.—Effect of addition of water on ash and malic acid values (Jones).} . 
Original sirup. _ Water added and heated. 
Ash. Ash. 
Sample No. : 
| Moist- Make Moist- a 
ure. 
Total pols neal; value Total Sole peal value 
| 
Perct.\ Per ct Ler. ct. | ther, ce. Per ct. | Per ct. | Per ct. | Per ct. 
Tht ee NE oe ol aera ee. 30. 53 0.79 0. 54 0. 25 0.61 | 39.21 0.81 0.53 0. 28 0. 63 
10 Reh Oe eee or ee 29.99 75 . 50 a7 7. ieee 96 55 .41 75 
104 ee ee ts 29. 46 69 .47 Pay 60 | 35.40 77 43 .34 an 
hy (ee On SE ca nia) 27.90 71 .50 94 -58 | 35.05 79 54 .25 .61 
OS Sea Bee 3 29. 64 65 45 . 20 -49 | 33.27 75 52 23 .52 
i eee Sreeee areea e 30. 69 71 .49 aoe SDD ee sOnto 92 65 7 .62 
IQR see oe | 30. 94 7 44 . 23 | ~65)| 35. 62 81 56 .25 .61 
dy ee ee | 31.04 72 51 Al .62 | 38.00 7 61 . 26 . 60 
Qi eee | | 26.75 72 44 . 28 .90 | 35.95 78 51 27 61 
ieee eee ne 28. 29 77 53 . 24 .67 | 39.40 86 60 . 26 . 66 
IS ae! SOS ee 30.7 7 51 LP3 AGE || ates 87 53 .34 . 64 
Average....... | 29.63 72 49 B23 64] 36.42 83 55 28 63 
1 Vt. Agr. Exp. Sta. Bul. 167, p. 471. 
The original samples were concentrated in each case below the 65 
per cent solid content and showed low analytical figures in most 
cases. Taking these same samples, with the sediment contained 
therein, and adding water and boiling again to about a 35 per cent 
moisture content, the analytical figures, with the possible exception 
of No. 108, where the second concentration is below 35 per cent, are 
well within the bounds of pure products. Average figures show that 
changing the concentration from 29.63 per cent water to 36.42 per 
cent has increased the ash from 0.72 to 0.83 per cent, and the insoluble 
ash from 0.23 to 0.28 per cent, but has not changed the malic acid 
content. From this, it is seen that in concentrating the maple sugar 
sirup for analysis the dry substance of the finished sirup should not be | 
much over 65 to 66 per cent. 
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