which passage (_Eleutherius_) I suppose you will think I might without rashness conclude, either that my opinion is favoured by that of _Paracelsus_, or that _Paracelsus_ his opinion was not alwaies the same. But because in divers other places of his writings he seems to talk at a differing rate of the three Principles and the four Elements, I shall content my self to inferr from the alledg'd passage, that if his doctrine be not consistent with that Part of mine which it is brought to countenance, it is very difficult to know what his opinion concerning salt, sulphur and mercury, was; and that consequently we had reason about the beginning of our conferences, to decline taking upon us, either to examine or oppose it. [Footnote 22: Paracel. de Mineral. Tract. 1. pag. 141.] I know not whether I should on this occasion add, that those very bodies the Chymists call Phlegme and Earth do yet recede from an Elementary simplicity. That common Earth and Water frequently do so, notwithstanding the received contrary opinion, is not deny'd by the more wary of the moderne Peripateticks themselves: and certainly, most Earths are much lesse simple bodies then is commonly imagined even by Chymists, who do not so consideratly to prescribe and employ Earths Promiscuously in those distillations that require the mixture of some _caput mortuum_, to hinder the flowing together of the matter, and to retain its grosser parts. For I have found some Earths to yield by distillation a Liquor very far from being inodorous or insipid; and 'tis a known observation, that most kinds of fat Earth kept cover'd from the rain, and hindred from spending themselves in the production of vegetables, will in time become impregnated with Salt-Petre.