MINERALOGY , t6$ 



reafons for this fuppofition. The generation or 

 fulphur and marcafite requires no preferable phlo- 

 srlfton out of any of the kingdoms of Nature, for 

 the phlogiftons throughout all nature are equally 

 alike St for it. v 



It is a iublime fubject for philofophers to en- 

 quire -how far fire, phlogifton, and electricity, have 

 an afhnity with, or dependance on, one another -, 

 but as they yet want that light in this matter 

 whrch they wi£h to have, I hope to be exculed for 

 not mentioning any theories on the fubject. 



This clafs is of great ufe in medicine •, for in- 

 fiance, the ambergnfe, the ialt of the yellow am- 

 ber, the rock-oil, the afphaltum, and the fulphur. 

 The rock-oil and fulphur are ufed in fireworks, 

 the afphaltum by the watchmakers, and the yellow 

 amber is ufed by the varnilhers and painters *. 



SECT. CLXIII. 



The FOURTH CLASS. 



METALS, MET ALL J, 



Are thofe mineral bodies which, with refpect 

 to their volume, are the heavier! of all hitherto-* 

 known bodies ; they are not only malleable, buC 

 they may alio be decompounded, and in a melt- 

 ing heat be brought again to their former ftate, 



* The cc^ls, however, are of the greatefl confluence for 

 their oeconftmic?J ufe : acd happy therefore are thole countries 

 which hiaye a fuffic e.v. quantity of then/, fi.nce they may be 

 employed ai fuel to aimo* zvzry purpol>_, which is plainly 

 prb/ed in £ifgkiid. E. 



M 2 by 



