fnm the Pyrites.' %y§ 



vity pcffible, confider three things, (i.) the na-> 

 ure of vitriol, (2.) its kinds, (3.) its production, 

 from all which will plainly appear the juftice of 

 my title. 



(1.) Vitriol confifteth abfolutely in an acid fait,, 

 an3 a metallic earth, both which are, by different 

 methods, to be procured from it ; the principal 

 of thefe I mall only touch on. 



Under the acid fait we are not to reprefent to 

 ourfelves fomething dry (and yet, what is fulphur 

 more than a concentrated vitriol-acid ?) but fome- 

 thing fluid and aqueous •, though the dry form of 

 acid falts be no impoffible thing, having, in an 

 uncommon manner, fhewn it from fpirit of nitre 

 and fpirit of tartar, for exhibiting a pure, acid, 

 dry, volatile fait. It may be feparated from its 

 vitriol-mixtion, either, as is ufually done, by di- 

 flillation, at firfl coming over in a white aqueous 

 form, called fpirit of vitriol, then in a thick, hea- 

 vy, yellowifh, and fomewhat earthy form, under 

 the appellation of oil of vitriol % or procured by 

 means of an intermediate, namely, a lixivious, 

 body, whence arife the known medicinal falts, 

 tar torus vitriolatus, arcanum duplicatum, fal mira- 

 bile Glauberi, &c. with this remarkable difference, 

 that it is not again to be forced out of the alcali, 

 in the fame manner as from the metallic earth, 

 without becoming again, by means of a new in- 

 termediate body, a formal fulphur •, when it exhi- 

 bits cither a fpiritus fulphuris per companum, or a 

 Vitriol again •, as from fulphur it fuffers itfelf to be 

 incorporated with a metallic earth. 



Next to fulphur and vitriol, it lodges chiefly in 

 alum, in which it has received its body from a 



T fattjfi 



