fco The fever al SPECIES 



Gcyeritfelf: from both which fulphur may be 

 driven or procured ; yet it is actually worked from 

 the firft fort only -, as the other, on account of 

 its greater impurity, and confequently large heap- 

 work, and the tedioufnefs of working it, would not 

 compenfate the trouble. On the contrary, there is 

 vitriol procured from both forts : from the firft, as 

 the fulphur and vitriol are almoft at once worked 

 for, or the advantages of working the fulphur exceed 

 the vitriol expences : from the fecond fort, as the ex- 

 pences of defulphuration, wherein the proper fur- 

 naces, and veffels, and attendance come high, are 

 fuperfeded, and the ore only prepared by a courfe 

 of common roafting. Now as that fort from the 

 'pyrites- groove, on account of its foreign admixture, 

 which is chiefly an iron-ftone, is not worked for 

 fulphur, it may with fome propriety be called a vi- 

 triol, and not a fulphur pyrites, and may in fome mea- 

 fure be oppofed to the other : might not therefore 

 the perfons, who firft applied thefe names, have a 

 regard to the fpontaneous vitriolifation of that fort, 

 and imagine them to have vitriol only, and no 

 fulphur ? Now, from my own fmall experience 

 in thofe matters, I look upon all pyrit* containing 

 fulphur, fpontaneoufly to refolve to a vitriol, tho' 

 many flowly and with difficulty \ the feweft, 

 with difpatch and eafe. Yet it might be allowed, 

 to call thofe that inftantaneoufly vitriolife in their 

 .entire fubft ance, without any refufe, out of eminence 

 vitriol-pyrites-, as theHefljan iron- ear th,iox inftance* 

 called alfo Magnefm vitriolaPa \ and in general, the 

 pyrites confiding of iron and fulphur, without any 

 other admixture, and of a round figure! 



The divifion into fulphur and arfenic pyrita 

 is better grounded. Of the firft fort are all thole 

 at the mines and fmelting-huts, called fimply py- 

 rites 7 and employed for procuring that regulus, 

 called crude-Jim, fulphur, fcc Again, all copper- 

 pyrites 



