The water in its own form boyling and hissing at the ends of the burning Wood betrayes it self to more then one of our senses; and the ashes by their weight, their firiness, and their dryness, put it past doubt that they belong to the Element of Earth. If I spoke (continues _Themistius_) to less knowing Persons, I would perhaps make some Excuse for building upon such an obvious and easie _Analysis_, but 'twould be, I fear, injurious, not to think such an Apology needless to You, who are too judicious either to think it necessary that Experiments to prove obvious truths should be farr fetch'd, or to wonder that among so many mixt Bodies that are compounded of the four Elements, some of them should upon a slight _Analysis_ manifestly exhibite the Ingredients they consist of. Especially since it is very agreeable to the Goodness of Nature, to disclose, even in some of the most obvious Experiments that Men make, a Truth so important, and so requisite to be taken notice of by them. Besides that our _Analysis_ by how much the more obvious we make it, by so much the more suittable it will be to the Nature of that Doctrine which 'tis alledged to prove, which being as clear and intelligible to the Understanding as obvious to the sense, tis no marvail the learned part of Mankind should so long and so generally imbrace it. For this Doctrine is very different from the whimseys of _Chymists_ and other Modern Innovators, of whose _Hypotheses_ we may observe, as Naturalists do of less perfect Animals, that as they are hastily form'd, so they are commonly short liv'd. For so these, as they are often fram'd in one week, are perhaps thought fit to be laughed at the next; and being built perchance but upon two or three Experiments are destroyed by 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