2^2 ANALYSIS. 



Opfcriptlon and: earthy matter was feparated, which, after edulcorati'on, was 

 analyfisofa added to the reft. The fluid from which it had been fepa- 

 Hiineralfrom i . , i , • . 



Cornwall. rated, and the edulcorating water, were again evaporated to 



drynefs, and the ammoniacal fait expelled by heat, in a pla« 

 tina crucible, 



(5.) After the crucible had been made red hot,, it was ex- 

 amined. I difcovered on the bottom of it, feme traces of 

 earthy matter, and fome fpots, which had a glafly appear- 

 ance. Water boiled upon it, dilTolved nothing ; from which 

 tircumftance, the abfence of both of the fixed alkaline falts 

 may be inferred. Neither did nitric acid produce any alte- 

 ration. A few drops of fulphuric acid efFeded a folution of 

 the fubftance, which adhered to the bottom of the crucible. 

 Ammonia precipitated from it a fmall quantity of earth> 

 which was transferred to the reft, and the fulphate of am- 

 monia and edulcorating water were again evaporated and 

 excelled by heat. A few fpots of thb fame glazing ftill 

 appeared. I had obferved the fame phenomenon in a former 

 experiment : but in that, as well as in the prefent infiance, 

 the fubftance was in too fmall a quantity to become the 

 fubjed of experiment. 



D. 



(1.) Upon the precipitate (C 1), and the earths collected at 

 different times, whilft they were in a raoift flate, I poured a 

 folation of potafli in alcohol mixed with diflilled water j in 

 a ftjort time, the greater part of it was diflblved. 



The clear folution was decanted, and the undiflblved fedi- 

 ment \^as transferred to a bafon of pure filver, and boiled with 

 a folution of potafli. 



(2.) When the potafli ceafed to aO. upon it, it was diluted 

 with diflilled water and decanted from a brown powder, 

 which had fubfided. This powder edulcorated, dried, and 

 ignited weighed -/^ of a grain ; | of a grain was alumina, 

 ■3?2 filita, and -^^ oxide of iron. 



(1.) The folution efFedled by potafli vcas decompofed and 

 rediflTolved by muriatic acid, and the contents of the folution 

 were precipitated by ammonia. The fubfided precipitate was 

 edulcorated. 



(2.) 



