240 
STATE AGRICULTURAL SOCIETY. 
use of super-phosphate of lime in defecation, it being a cheap 
substitute and a more effective agent than carbonic acid, elim¬ 
inating the lime, and at the same time destroying the effect of 
the alkaline salts which the juice contain^. By some manu¬ 
facturers sulphate ot alumina is used to eliminate the lime. 
This, also,' is an effective agent, and prevents coloring, but by 
its use deposits are left in the juice which are difficult to re¬ 
move, and a sulphate of lime is produced, which must be 
removed by filtering at twenty-six or twenty-eight degrees 
Beaume. 
The different processes used in purifying the juice are briefly 
described by Basset as follows: * 
Ordinary Process .—Elevation of the juice to the tempera¬ 
ture of seventy-five or eighty degrees centigrade ; introduction 
and mixture of milk of lime ; elevation of the temperature to 
the boiling point; time to allow the liquid to settle; decanta¬ 
tion of the clear juice; pressure of the foam and insoluble 
deposits ; filtration of the juice through animal charcoal. 
Barnuel Process .—This is the same as the above, with the 
following modifications: an excess of Ijme is introduced so as 
to turn the sugar into saccharate of lime. The liquor is then 
decanted and submitted to a current of carbonic acid. The 
juice is then allowed to settle and filtered as above described. 
The sulphate of alumina process has been before referred to. 
Double Carhonation. —This is similar to Barnuel’s process, with 
this exception, that after the first action of the carbonic acid a 
new quantity of lime is introduced, and the juice is again 
subjected to the carbonic acid. Decantation and filtration the 
same as above described. 
Troubled Defecation .—Elevation of the juice to the tem¬ 
perature of seventy-five or eighty degrees centigrade; intro, 
duction of lime; then, without decantation, the introduction 
of carbonic acid. Decantation, pressure of the deposits, and 
filtration of the juice through animal charcoal, as before de¬ 
scribed. 
Etudes Bur TExposition de 1867. 
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