SULPHATE OF ALUMINA. 139 
far inferior to the defecating compound above mentioned. 
Alum has been used in the beet sugar manufacture, and 
has sometimes been highly commended, but its employ- 
ment should be entirely discarded. It leaves in the juice 
a solution of sulphate of potash, a salt which, in addition 
to imparting a bitter and offensive taste, also gives the 
property of deliquescence to the sugar. 
» 
