The Fifth Part.

them and his Doctrine. For since There is a manifest Difference betwixt the Saline and the insipid Parts of Ashes, I see not how substances That Disagree in such Notable Qualities can be both said to be Portions of an Element, whose Nature requires that it be Homogeneous, especially in this case where an Analysis by the Fire is suppos’d to have separated it from the admixture of other Elements, which are confess’d by most Aristotelians to be Generally found in common Earth, and to render it impure. And sure if when we have consider’d for how little a Disparities sake the Peripateticks make these Symbolizing Bodies Aire and Fire to be two Distinct Elements, we shall also consider that the Saline part of Ashes is very strongly Tasted, and easily soluble in Water; whereas the other part of the same Ashes is insipid and indissoluble in the same Liquor: Not to add, that the one substance is Opacous, and the other somewhat Diaphanous, nor that they differ in Divers other Particulars; If we consider those things, I say, we shall hardly think that both these Substances are Elementary Earth; And as to what is sometimes objected, that their Saline Tast is only an Effect of Incineration and Adustion, it has been elsewhere fully reply’d to, when propos’d by Themistius, and where it has been prov’d against him, that however insipid Earth may perhaps by Additaments be turn’d into Salt, yet ’tis not like it should be so by the Fire alone: For we see that when we refine Gold and Silver, the violentest Fires We can Employ on them give them not the least Rellish of Saltness. And I think Philoponus has rightly observ’d, that the Ashes of some Concretes contain very little salt if any at all; For Refiners suppose that bone-ashes are free from it, and therefore make use of them for Tests and Cuppels, which ought to be Destitute of Salt, lest the Violence of the Fire should bring them to Vitrification; And having purposely and heedfully tasted a Cuppel made of only bone-ashes and fair water, which I had caus’d to be expos’d to a Very Violent Fire, acuated by the Blast of a large pair of Double Bellows, I could not perceive that the force of the Fire had imparted to it the least Saltness, or so much as made it less Insipid.