CHAPTEB YI. 



Cane-juice. — Composition. — Tempering. — Use of Lime. — Phenol- 

 Plitlialein Test for Lime. — Clarifying. — Formation of 

 Scum. — Treatment of Scum. — Filter-presses. — Composition 

 of Filter-press Cake. — Uses of the Cake. — Value of Cake. 



THE cane- juice as it runs from the mill may be 

 regarded as a solution of sugar in water, with 

 various impurities. It varies considerably in com- 

 position according to the variety and ripeness of 

 the cane, the soil, the season, whether wet or dry, 

 and numberless other circumstances. A fair sam- 

 ple of cane-juice will contain about 



Per cent. 



Cane Sugar 17.5 



Glucose 5 



Mineral Matter 3 



Organic Matter other than Sugar 7 



Water 81.0 



Total 100.0 



The organic matter other than sugar consists of 

 albumen, fat, wax, colouring matter, and a variety of 

 substances the properties of which are but little 

 understood. 



The juice is received into vessels termed clari- 

 fiers. These in the case of windmill estates are 

 placed over the flues leading from the battery, and 

 are thus heated by direct firing. On estates possess- 

 ing steam plant the exhaust steam from the engine 



