In the Pyrites. 153 



(2.) That taking certain lutes, as chalk, and 

 roafting it foftly and gradually along with pyrites % 

 a fdver- grain will certainly be procured, otherwife 

 not procurable from fuch an earth, and which con- 

 fequently may be juftly affirmed not to be in it, but 

 rather maturated, concocted, made, or tranf- 

 muted by it. 



Laftly, That here we feem to difcover a foun- 

 dation, that may tend to the improvement of 

 fmelting ores •, not to mention the iron, lodged 

 with the fulphur in the pyrites, which principally 

 contributes to the bufinefs of fluxion and fepara- 

 tion. 



As the metallic earth, joined with the fulphur in 

 the pyrites, is two-fold, namely, iron and copper, 

 the former at ail times, the latter often at the fame 

 time therein, it remains to enquire, what their dif- 

 ferent connection with each other ufuallyis. 



Ci.) Sulphur endures being feparated very eafily 

 from the iron earth, fo as fometimes to lie loofe 

 therein ; whereas it clings more clofely to the cop- 

 per earth, infomuch that it is often perceived to flux 

 along with, rather than part from it ; as appears 

 not only from copper-proofs very readily caking 

 together, but from the copper-Hone at the huts; 

 which, after having gone thro' a number of fires, 

 both in roafting and fmelting, ft ill exhibits many- 

 large lumps in the form of real yellow copper-ore. 

 'Tis true, arfenic, which always lodges in the copper- 

 •ore, but never in pure iron-pyrites, may be the means 

 of this clofer union ; nay, is of itfelf alone capable of 

 effecting this, and with its metallic earth adhering 

 to ir, of coming into an intimate union, namely, 

 into flux 5 as it dire&Iy fhews this (upon commit- 

 ting 



