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Method for examining Minerals, By which we may be enabled to afcertain the dis- tinguijhing characters, and principal prevalent component parts, of a mineral Jubjlance ; and to determine thereby, the clafs, divijion, order, genus, and fpecies, to which it may accordingly belong, and be placed in the fyjlematkal ar rangement, which I have adopted. ‘This me thod will be found applicable by thofe who are acquainted with the rudiments of chemijlry. A S many mineral fubftances are fubjeft to undergo alteration, and mixture, where by their appearance, andpartof their qualities is Vol. II. ' U altered;