or with the parts of one of the bodies, as to make the compound Bodies, whose Ingredients they are, resoluble into more, or other Elements then those that Chymists have hitherto taken notice of. To all which I may add, that since it appears, by what I observ'd to you of the permanency of Gold and Silver, that even Corpuscles that are not of an Elementary but compounded Nature, may be of so durable a Texture, as to remain indissoluble in the ordinary _Analysis_ that Chymists make of Bodies by the Fire; 'Tis not impossible but that, though there were but three Elements, yet there may be a greater number of Bodies, which the wonted wayes of Anatomy will not discover to be no Elementary Bodies. But, sayes _Carneades_, having thus far, in compliance to you, talk't conjecturally of the number of the Elements, 'tis now time to consider, not of how many Elements it is possible that Nature may compound mix'd Bodies, but (at least as farr as the ordinary Experiments of Chymists will informe us) of how many she doth make them up. I say then, that it does not by these sufficiently appear to me, that there is any one determinate number of Elements to be uniformly met with in all the several sorts of Bodies allow'd to be perfectly mixt. And for the more distinct proof of this Proposition, I shall in the first place Represent, That there are divers Bodies, which I could never see by fire divided into so many as three Elementary substances. I would fain (as I said lately to _Philoponus_) see that fixt and noble Metal we call Gold separated into Salt, Sulphur and Mercury: and if any man will submit to a competent forfeiture in case of failing, I shall willingly in case of prosperous successe pay both for the Materials and the charges of such an Experiment. 'Tis not, that after what I have try'd my self I dare peremptorily deny, that there may out of Gold be extracted a certain substance, which I cannot hinder Chymists from calling its Tincture or Sulphur; and which leaves the remaining Body depriv'd of its wonted colour. Nor am I sure, that there cannot be drawn out of the same Metal a real quick and running Mercury. But for the Salt of Gold, I never could either see it, or be satisfied that there was ever such a thing separated, _in rerum natura_, by the relation of any credible eye witnesse. And for the several Processes that Promise that effect, the materials that must be wrought upon are somewhat too pretious and costly to be wasted upon so groundlesse adventures, of which not only the successe is doubtful, but the very possibility is not yet demonstrated. Yet that which most deterres me from such tryalls, is not their chargeablenesse, but their unsatisfactorinesse, though they should succeed. For the Extraction of this golden Salt being in Chymists Processes prescribed to be effected by corrosive _Menstruums_, or the Intervention of other Saline Bodies, it will remain doubtful to a wary person, whether the Emergent Salt be