Robert Boyle,
The Sceptical Chymist — The Sixth Part
“ And if some reasons did not forbid me, I could now tell you of a Menstruum I make my self, that doth more odly dissociate the parts of Minerals very fixt in the fire. So that it seems not incredible, that there may be some Agent or way of Operation found, whereby this or that Concrete, if not all Firme Bodies, may be resolv’d into parts so very minute and so unapt to stick close to one another, that none of them may be fixt enough to stay behind in a strong Fire, and to be incapable of Distillation; nor consequently to be look’d upon as Earth. ”
