( 5^ ) of that kind, altho’ the great Connexion they have with the right Knowledge of Metals, whereof we treat, makes it necefiary to handle fome of them, and to make the Weaknefs of their Foundation plainly to appear. They fay, that the Alchymifts are igno rant of the Manner whereby Nature creates and brings Metals to perfection ; and that it is erroneous to fry, they are compounded of Quickfilver and Brimftone, becaufe if it were fo, there would be found in the Mines of Gold and Silver, and of other Metals, fevcral Indi cations and Pieces of thofe Juices ; whereas common Experience fhews the contrary ; for Anfwer thereunto, the firft Part of that Reafou imports little ; for though it be granted, it in fers no more, but that thofe Alchymifts that went about thofe Tranfmutations, proceeded mechanically, and without good Knowledge in the Art; but neverthelefs it remains poflible that fuch Tranfmutation may be made, Tire fecond Part of the foremention’d Reafons fhews plainly the great' Rafhnefs wherewith they affirm that which they know very little of; for there is nothing more ex perimentally known concerning Metals, than their ordinary Mixture with Brimftone ; and the Abundance of Brimftone in Minerals is an efpccial good Sign of the Richncfs ; a fuf- ficient Example whereof is the Rofe-colour’d Oar of the famous Mountain of Sandla Ifa- bslla of new Potoji, in the rich Province of the LipeSy wdiich is almoft all Plate, and cu- gendraj amongft fuch Abundance of Brimftone, that tire Cavities and hollow Places in the Rocks