Part of the First Dialogue.

a third or fourth, whereas the doctrine of the four Elements was fram’d by Aristotle after he had leasurely considered those Theories of former Philosophers, which are now with great applause revived, as discovered by these latter ages; And had so judiciously detected and supplyed the Errors and defects of former Hypotheses concerning the Elements, that his Doctrine of them has been ever since deservedly embraced by the letter’d part of Mankind: All the Philosophers that preceded him having in their several ages contributed to the compleatness of this Doctrine, as those of succeeding times have acquiesc’d in it. Nor has an Hypothesis so deliberately and maturely established been called in Question till in the last Century Paracelsus and some few other sooty Empiricks, rather then (as they are fain to call themselves) Philosophers, having their eyes darken’d, and their Brains troubl’d with the smoke of their own Furnaces, began to rail at the Peripatetick Doctrine, which they were too illiterate to understand, and to tell the credulous World, that they could see but three Ingredients in mixt Bodies; which to gain themselves the repute of Inventors, they endeavoured to disguise by calling them, instead of Earth, and Fire, and Vapour, Salt, Sulphur, and Mercury; to which they gave the canting title of Hypostatical Principles: but when they came to describe them, they shewed how little they understood what they meant by them, by disagreeing as much from one another, as from the truth they agreed in opposing: For they deliver their Hypotheses as darkly as their Processes; and ’tis almost as impossible for any sober Man to find their meaning, as ’tis for them to find their Elixir. And indeed nothing has spread their Philosophy, but their great Brags and undertakings; notwithstanding all which, (sayes Themistius smiling) I scarce know any thing they have performed worth wondering at, save that they have been able to draw Philoponus to their Party, and to engage him to the Defence of an unintelligible Hypothesis, who knowes so well as he does, that Principles ought to be like Diamonds, as well very clear, as perfectly solid.