152 Of the S u l p 11 u r 



of the many lead and tin proceffes mentioned by 

 Kelner, ought not to be rejected, as they certainly 

 carry appearances of what has really happened, 

 notwithstanding many others have mifcarried in 

 their attempts, to imitate his experiments. To them 

 alfo belong the cinnabar-procefTes, where again the 

 fulphur comes principally in play, and which, by 

 pafling through the hands of impoftors, have fallen 

 jnto difcredic. 



On the head of the lead and tin procefTes I fhall 

 only mention, that the bufinefs depend s y in fome 

 meafure, on the due preparation of the metal or 

 earth, particularly on its moft intimate fubtilifa- 

 tion ; to the fame purpofe is alfo neceffary fuch a 

 degree of warmth, as that the fulphur (hall juft 

 come to exert its activity, without being made to 

 run. As to the fulphur * while yet in its ore-ftate, 

 I have made numerous proofs with fulphur-pyritesy 

 and found, that in certain circumftances, there 

 may, in regard to the exaltation of the metallic 

 earths, or the metallifation of the crude earths, 

 fomething be performed therewith, which is not 

 performable with fulphur alone. And this is a fuf- 

 iicient hint, without being more explicit, to a di- 

 ligent enquirer into nature. 



But I cannot help obferving : ( 1.) The extraor- 

 dinary nature of native calamy ; namely, that an 

 earth, fuch as that properly is, which of itfelf af- 

 fords no metal, except a very inconfiderable fhare 

 of iron, mould, upon being mixed with a body 

 appropriated to it, for inflance, copper, become 

 almoft intirely, as is well known, metallic, and in- 

 corporated with the copper, withput deftroying its 

 malleability, and confequently its true metallic cha- 

 racter, 



(2,) That 



