The First Part.

Hypostatical Principles; it being sufficient that the Fire divides them into such, though afterwards they employ other Bodies to collect the similar parts of the Compound; as ’tis known, that though they make use of water to collect the Saline parts of Ashes from the Terrestrial wherewith they are blended, yet it is the Fire only that Incinerates Bodies, and reduces the fix’d part of them into the Salt and Earth, whereof Ashes are made up. This Objection is not, I confess, inconsiderable, and I might in great part allow of it, without granting it to make against me, if I would content my self to answer, that it is not against those that make it that I have been disputing, but against those Vulgar Chymists, who themselves believe, and would fain make others do so, That the Fire is not only an universal, but an adæquate and sufficient Instrument to analyze mixt Bodies with. For as to their Practice of Extracting the fix’d Salt out of Ashes by the Affusion of Water, ’tis obvious to alleadge, that the Water does only assemble together the Salt the Fire had before divided from the Earth: as a Sieve does not further break the Corn, but only bring together into two distinct heaps the Flour and the Bran, whose Corpuscles before