tf the Pvrite s* ziy 



We are here not to confider nature under the 

 notion of a builder, who collects and prepares his 

 materials, but rather as forming mixts, in the ■ 

 courfe of the composition itfelf 5 or, in the courfe 

 of the decompofition, compounds \ and, in the courfe 

 of the formation, forming new materials, not ex- 

 ifting before •, and even by means of deftructton, 

 which readily happens not without new produc- 

 5 ; though fome, from experiment, might 

 maintain the contrary : as it muft be allowed, ore 

 may be prepared and formed by art, from parts 

 already mixt and compounded, as metal and ful- 

 phur, yet no confequence can be drawn from art 

 to nature •, though, fo far fliould feem probable, 

 that nature and art may proceed in the very fame 

 manner: and I have made feveral experiments, in 

 the view of mineralifing metals, which I mall here 

 communicate. 



A proper ore confifts, proximately, in a metal- 

 lic earth, fulphur, and arfenic (either one, or both 

 together, of thefe two volatile matters,) to which 

 may be added a frequent admixture of an unme- 

 taliic crude earth 5 I mean fuch a crude earth as 13 

 incorporated with the mineralifed metal, or pro- 

 per ore mixture, and not a kind of ftone and mi- 

 neral adhering to the ore : I alio do not mean ore 

 in a lax . :. according to which, all forts .of 

 ftone, barren in metal, fulphur, and arfenic, are 

 called a mineral, or ore : nor do I mean ore in 

 the ufual notion of miners, who ftile filver hold- 

 ing / c and browns^ ores 5 but I intend fuch, 

 metal is plainly and eminently itzn mi- 

 neralifed, or reduced to an ore-date: or, ore in 

 : ■ . •. is either z fulphur at ed^ or arfe- 

 ter, copper-ore, 

 Oi lijb, glajf) ores, swd the like. 



U 4 When 



