370 PROCEEDINGS OF THE SCIENTIFIC ASSOCIATION. 



men-oil and colouring matters and at the same time prevent 

 any degenerating process from beginning through the action 

 of the air on vegetable ferment or otherwise till ample time 

 elapse for driving off the superfluous water and isolating the 

 whole sugar in a state of purity. It was further stated that 

 the next best mode of extraction, where the desiccation of 

 the slices was undesirable, would be to macerate the slices as 

 they fell in vessels containing water dosed appropriately with 

 bisulphite of Lime. In either case the displacement of the 

 sugar would be attained in the former methods entirely, and 

 in the latter to extent of about nine-tenths of the whole but 

 of somewhat inferior purity. Whenever the slightest impu- 

 rity occurs, it should be at once removed by filtration, 

 through charcoal, as it may be safely maintained with Dmitri 

 Davidou, probably the best practical writer on the manufac- 

 ture of Beet-root sugar, that previous to evaporation, "the 

 juice must be in a slate of perfect purity." To this axiom 

 every manufacturer who hopes for success must implicitly 

 conform, and the planter in these colonies who chooses to 

 incur the extra expense and trouble, will yet find it much 

 easier to do so in the earlier stages of manufacture, than 

 in manipulating the comparatively weak but complex juice of 

 the Beet in Europe, or in refining, an originally low quality 

 of Muscovado. 



To attain such purify animal charcoal is the agent almost 

 universally employed, but wood charcoal and many shales 

 possess similar power and though in less degree have been 

 occasionally used a institutes. To gentlemen com 

 with this Colony it must be interesting and may be profit- 

 able to know, thai in the Bitumen which exists so abundantly 

 in the Pitch Lake and elsewhere, they po lib bance 



