Your _Author_ relating how he dissents from the _false Doctrine_, as he terms it, _of the Schools_, concerning the Elements, and their Mixtures, Qualities, Temperaments, Discords, &c. in order to Diseases, is pleased to say as follows:[1] _I have sufficiently demonstrated, that there are not four Elements in Nature, and by consequence, if there are onely three, that four cannot go together, or encounter; and that the fruits which Antiquity hath believed to be mixt bodies, and those composed from a concurrence of four elements, are materially of one onely Element; also that those three Elements are naturally cold; nor that native heat is any where in things, except from Light, Life, Motion, and an altering Blas: In like manner, that all actual moisture is of Water, but all virtual moisture from the property of the seeds: Likewise, that dryness is by it self in the Air and Earth, but in Fruits by reason of the Seeds and Coagulations; and that there are not Contraries in Nature._ To give you my opinion hereof, first I think it too great a presumption in any man, to feign himself so much above the rest, as to accuse all others of ignorance, and that none but he alone hath the true knowledg of all things as infallible and undeniable, and that so many Learned, Wise and Ingenious Men in so many ages have been blinded with errors; for certainly, no particular Creature in Nature can have any exact or perfect knowledg of Natural things, and therefore opinions cannot be infallible truths, although they may seem probable; for how is it possible that a single finite Creature should know the numberless varieties and hidden actions of Nature? Wherefore your _Author_ cannot say, that he hath demonstrated any thing, which could not be as much contradicted, and perhaps with more reason, then he hath brought proofs and demonstrations: And thus when he speaks of Elements, that there are not four in Nature, and that they cannot go together, or encounter, it may be his opinion; but others have brought as many reasons to the contrary, and I think with more probability; so as it is unnecessary to make a tedious discourse thereof, and therefore I'le refer you to those that have treated of it more learnedly and solidly then I can do. But I perceive your _Author_ is much for Art, and since he can make solid bodies liquid, and liquid bodies solid, he believes that all bodies are composed out of the Element of Water, and that Water therefore is the first Principle of all things; when as Water, in my opinion, is but an Effect, as all other natural Creatures, and therefore cannot be a cause or principle of them. Concerning the _Natural coldness of Water, Air, and Earth,_ it may be, or not be so, for any thing your _Author_ can truly know; but to my sense and reason, it seems probable that there are things naturally hot and moist, and hot and dry, as well as cold and moist, and cold and dry: But all these are but several effects produced by the several actions of Natural