see how. When the first say, that the Smoak in burning Wood represents the Air, we say they are in the right, for it is only by way of Analogy and similitude, that this Smoak can obtain the denomination of Air; For it is not really Air, since experi∣ence sheweth us, that this smoak imprisoned in a Recipient, hath qualities very much differing from that of Air; whence we inferr, it can be called Air, only by Analogy. And this is the point in which both do differ, concerning this substance, that the Peripa∣teticks call it Air, and Chymists Mercury: Let them dispute of the words, provided we do agree in the thing it self.
We come now to the other Element of Peripateticks, viz. Fire, and the other Principle of Chymisters, Sulphury, which we are to examine, and see in what they agree, and wherein they differ. The first say, that in the action of Fire preying upon Wood, its action is manifest to the senses. But our answer to this sensible experiment is, that whatsoever destroyes the Mixt, cannot be a constitutive Principle of it, but rather a Principle of destruction: If they return, That no fire is actually in the Mixt, but only po∣tentially: therein we will close with them, and reconcile them with the Chymists, who name their Sulphur that potential fire of Peripateticks. To end then their Controversie, I say, that the fire which we see to issue out of burning Wood, is nothing else but the Sulphur of Wood actuated; for the actuating of Sulphur doth consist in its inflamation. As for the Ashes which they will have to be the Element of Earth; that Salt which by washings and Elixivation is extracted out of them, should sufficiently per∣swade these Philosophers, that the Chymists are as well, if not better, grounded in establishing the number of their Principles.
The number then of Principles and Elements which compound Mixt Bodies, being thus cleared, it remains for us to say some∣thing of the Elements, both as to their number and propriety, before we speak of them severally, as also of their Matrixes and Fruits.
It is a thing to be wondred at, that the Sectators of Aristotle, should not yet since so long a time that his Writings and Philo∣sophy are in credit, have determined the number of Elements: For some amongst them with great reason do affirm, that there is no Elementary Fire; I say, with reason, if it be understood in