and its taste in consequence of this operation is no- 

 tably improved. It is deprived of the greater part of 

 the organic substances that might be still contained 

 in it, the lime and nearly all the alkaline salts. 



When the filter has been used for 6 hours for 

 the syrups, it is used for the juice which take up 

 the remains of the syrup in it. 



After the second filtration, the syrup is then 

 purified as much as possible; it only contains water, 

 sugar and a very small portion of salts of potash and 

 soda. 



The last concentration is then preceded with, the 

 boiling down. 



(). BOILING DOWN. 



We have si'on that there remains 4200 gallons of 

 syrup at 27 B. containing : 



Solid matters in solution 20,870 Ibs. 



Water -20,870 u 



We must bring this syrup to such a point of 

 concentration as that the sugar may crystallize. For 

 this purpose we must remove still 94 per cent of the 

 water which it contains, say 19,620 pounds or 2450 

 gallons and there will remain 1750 gallons of a 

 boiled mass containing : 



Sugar and some other substances.. .20, 870 Ibs. 

 Water 1,250 * 



Say 22,120 



