Sl6 SCIENTIFIC NEWS. 



sugar is lost Wy pily enabled us to enjoy the use of sugar in all its purity, 

 "'"§• we must confess, that we do not obtain this advantage with- 



out sacrificing a part of the saccarine matter it contains : 

 for it Ks certain, that, if the melasses, which probably 

 amount to more than a third, could likewise be deprived of 

 the extractive matter concentrated in it by evaporation, as 

 well as bj/ the sevCial preparaiions it undergoes, with the 

 foreign matters latro laced into it by the potash, lime, and 

 bullock's blood, we should have in it a sirup, which, not- 

 withstanding the inconvenience of its fluidity, would be a 

 very useful substitute for sugar, in all cases where the lux- 

 ury of our tables does not render the latter indispensible. 

 And it would have the farther advantage of sv.'cetening in 

 smaller quantities: at least I may reasonably infer tl>is from 

 the raelas^>es J have separated from raw sugar, the qualities 

 of which render it far superior to the melasses of our sugar 

 refiners, as it is not contaminated by any foreign mixture. 

 fTo be concluded in our tiext.j 



SCIENTIFIC NEWS. 



An Essay on the Warming of Mills, and other Bnildhigs, ly 

 Steam. By Robert Buchanan, civil Engineer. Glasgow. 



Buchanan on 1^ this little but valuable pamphlet Mr. Buchanan has 

 warming collected the principal facts relative to the application of 



Wdmgs by g^^^^^^ f^^ ^he purpose of communicating heat. There are 

 two points of view in which this subject may be considered, 

 safety and economy. In large manufactories of combusti- 

 ble articles the safety arising from the exclusion of coal fires 

 must be an obvious advantage. How far it may be econo- 

 mical must depend greatly on local circumstances. 

 History. The idea was suggested by Colonel VVm. Cook, in the 



Philosophical Transactions for 1745, but it does not appear 

 to have been applied practically. Mr- Snodgrass first ap- 

 plied it to the warming of cotton works In 179S; see our 

 Journal, vol. XVI, p. 326 : and his example was followed by 

 others. 

 Hearls of the Mr. B. arranges his subject under the following heads: 

 subject. ^ rj^j^g proportionate size of boilers and quantity of fuel, 



2. Tho 



