(sayes he to Carneades) propose this Difficulty, not to call it Cavill, otherwise then as an Exercise of wit, and not as laying any weight upon it. For how can that be separated from a thing that was not existent in it. When, for instance, a Refiner mingles Gold and Lead, and exposing this Mixture upon a Cuppell to the violence of the fire, thereby separates it into pure and resulgent Gold and Lead (which driven off together with the Dross of the Gold is thence call’d Lithargyrium Auri) can any man doubt that sees these two so differing substances separated from the Mass, that they were existent in it before it was committed to the fire.
I should (replies Carneades) allow your Argument to prove something, if, as Men see the Refiners commonly take before hand both Lead and Gold to make the Mass you speak of, so we did see Nature pull down a parcell of the Element of Fire, that is fancy'd to be plac’d I know not how many thousand Leagues off, contiguous to the Orb of the Moon, and to blend it with a quantity of each of the three other Elements, to compose every mixt Body, upon whose Resolution the
