SUGAR AND RUM. 
Ill 
as fuel for the engines that drive the mill. The 
sweet juice is collected in a large cistern beneath 
the rollers. 
4. Now the air acts upon this juice very quickly 
— so quickly, indeed, that if the liquid were ex- 
posed to the action of the air for even half an hour, 
it would become quite acid and unfit for use. So 
a little powdered lime is immediately added, and 
the liquid is then gently heated in pans called 
clarifiers. This treatment causes a scum to rise 
which is easily skimmed off, and in that way the 
impurities are removed. 
5 . The hot juice is then run into the first of a set 
of iron or copper boilers, where the heat is greatly 
increased. As it boils, the water steams off from 
it, causing it to become thicker. It is then put 
into the next boiler and made still thicker, and is 
similarly passed on to the third and the fourth 
boilers. 
6. By the time the juice enters the last boiler it 
has become a thick syrup. This syrup is then 
heated, until so much water has been driven out 
of it that, on cooling, the sugar will form in solid 
grains. This it does in large open vessels, or coolers, 
into which it is next placed. With the grains of 
sugar, however, we get molasses, that is, syrup that 
does not grain. 
7 . When quite cool, the sugar is dug out and put 
into hogsheads with holes at the bottom, through 
