tgS Refcarches refpeBing 



the courfe of the evaporation was much more confiderable 

 than would have been obtained from the fimple folution of 

 this fait and water; io that its folubility was augmented by 

 the action of the other fuhftances. 



B. Two parts of fulphate of potafli and one of nitrate of 

 lime, gave firft fulphate of potafh and fulphate of lime; and, 

 by. fucceeding evaporations, nitrate of potafh and the twoful- 

 phates, the proportions of which continued to decreafe to 

 the laft cryftallization. Tbere remained only fome drops of 

 the liquid uncryftallized, which did not precipitate with car- 

 bonate of foda, but did with nitrate of barytes: hence they 

 were probably formed of fulphate of potafh and a fmall por- 

 tion of nitrate of potafli. 



C. Two parts of nitrate of lime, and one of fulphate of 

 potafli, yielded, during the firft evaporation, a fmall quantity 

 of fulphate of lime, and, by cooling, nitrate of potafli : the 

 other evaporations only produced nitrate of potafli. In the 

 latter, however, fome cryftals of fulphate of lime were per- 

 ceived at the furface of the liquid. The refidue, which was 

 abundant, was feveral times fubmitted to evaporation and 

 cooling, but did not afford cryftals of any fait. This uncry- 

 ftallizable refidue, treated with alcohol, formed an abundant 

 depofit, which, having been diflblved in water, fcarcely af- 

 forded any precipitate with nitrate of barytes. It contained, 

 therefore, little or no fulphuric acid, and confifted of pure 

 nitraie of potafli : the portion diiTblved by alcohol was nitrate 

 of lime, with a fmall portion of nitrate of potafli. The un- 

 cryftallizable refidue was therefore compofed of nitrate of 

 potafh and nitrate of lime. 



In this experiment we fee that the fulphate of lime was 

 rendered much lei's ioluble than in the preceding experiments ; 

 but that a confiderable quantity of nitrate of potafli loft the 

 property of cryftallizing by the acYion exerted on it by the 

 nitrate of lime. 



3. In thefe three experiments fulphate of lime muft have 

 been formed, becaufe the lime and iulphurie acid coining in 

 contact, would feparate on account of the infolubility which 

 belongs to their combination. 



The fulphate of lime in the experiments A and B, was 

 rendered much more foluble than it naturally is, by the 

 action of the fubfiances which were in folution ; but in the 

 experiment C, its folubility was not feniibly increafed, pro- 

 bably becaufe the nitrate of lime and the nitrate of potafh, 

 which formed the uncryftallizable liquid, mutually experi- 

 enced a degree of faturation, which considerably weakened- 

 their action upon the fulphate of lime. 



4. From 



