r Chemical Science. 437 



Four proportions of carbonate of soda and one of dolomite 

 became very liquid at a red heat : when cold, the compound was 

 homogeneous, slightly translucid, and with a crystalline lamellar 

 fracture. 



Single proportionals of sulphate of soda and carbonate of baryta, 

 or sulphate of baryta and carbonate of soda ; or sulphate of soda 

 and carbonate of strontia ; or sulphate of strontia and carbonate of 

 soda, gave very fusible compounds, liquid at a white heat ; which, 

 when cold, were compact, stony, nacreous and opaque, with an 

 irregular fracture, and slightly crystalline. 



Single proportionals of sulphate of soda and carbonate of lime, or 

 sulphate of lime and carbonate of soda, fused quietly at a red heat, 

 and yielded compact granular substances slightly crystalline, whitCj 

 and translucent. A higher heat evolved carbonic acid. 



Single proportionals of chloride of sodium and carbonate of 

 baryta, or of chloride of barium and carbonate of soda, readily 

 fused into transparent liquids, yielding compact translucent solids, 

 very white, and with a scaly, unequal, fracture like quartz. 



Single proportionals of chloride of sodium and carbonate of lime, or 

 chloride of calcium and carbonate of soda, gave shnilar results, but 

 would not bear a white heat without evolution of carbonic acid. 



Single proportionals of chloride of barium and carbonate of 

 baryta very readily liquefied ; the solid matter was compact, of a fine 

 blue colour, translucid, of a scaly fracture, and presented appear- 

 ances of crystallization. 



A similar mixture of chloride of calcium and carbonate of lime 

 fused with equal facility at a red heat, but became solid at a white 

 heat. 



One proportional of carbonate of potash, with one and with two 

 proportionals of fluorspar. Both mixtures readily fused ; the solid 

 compounds were compact, stony, slightly translucid, and pre- 

 sented appearances of crystallization. A white heat solidified them. 



Sulphate of soda and sulphate of lime easily fuse together ; the 

 glauberite is such a natural compound. Single proportionals of 

 sulphate of soda and sulphate of magnesia become fluid at a red 

 heat, and give a compact double salt, semi-transparent, having a 

 waxy fracture and surface like chalcedony, and no appearance of 

 crystallization. 



Single proportionals of the sulphates of soda and baryta fused 

 completely at a white heat, and produced a compact, white, opaque 

 solid, of a granular fracture, crystalline, and with small cross crys- 

 tals here and there. 



Single proportionals of the sulphates of lead and soda became as 

 liquid as water at a red heat. When cold, the matter was compact, 

 opaque, and gave no appearance of crystallization. 



All these compounds are very feeble ; water alone destroys them ; 

 but that they are true compounds, and not mixtures, is shown by 

 their perfect fluidity and homogeneity, and especially by the circum- 



