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CHEMICAL ANALYSIS. 



One hundred parts contain the following fubftances in nearly the 

 proportions annexed : 



The procefs by which a mineral fubftance, of the nature of that 

 which is the fubjed of this paper, js analyfed, is fo fimple, and 

 well known, as almofl: to render any detail of the operation unne- 

 ceffary. More than one analyfis was made. The muriatic and 

 acetous acids were feverally ufed to take up the carbonate of lime j 

 but the former diflblved the iron alfo. The metal was precipi- 

 tated from the muriatic folution by pruffiate of pot-afh, and the 

 lime feparated from each bj? carbonate of pot-afh. The argill was 

 extricated with difficulty, by long digeftion and boiling in ful- 

 phuric acid, and precipitated by carbonate of foda. — Befides the 

 general analyfis, each ingredient was feparately colleded from dif- 

 tind portions, of loo grains each, of the fpecimen. 



The 



