I cannot in reason give my consent to your _Authors_ opinion,[1] That _Fishes do by the force or vertue of an inbred Seed transchange simple water into fat, bones, and their own flesh, and that materially they are nothing but water transchanged, and that they return into water by art._ For though my opinion is, that bodies change and alter from one figure into another, yet they do not all change into water, neither is water changed into all other figures; and certainly Fishes do not live nor subsist meerly by Water, but by several other meats, as other animals do; either by feeding upon other Fishes, the stronger devouring the weaker, or upon Mud, and Grass, and Weeds, in the bottom of Seas, Rivers and Ponds, and the like: As for example, put Fish into a Pool or Sluce, wherein there is not any thing but clear, pure water, and in a short time they will be starved to death for want of Food; and as they cannot live onely by water, so neither can they breed by the power of water, but by the power of their food, as a more solid substance: And if all Creatures be nourished by those things whereof they consist, then Fishes do not consist of water, being not nourished by water; for it is not the transchanging of water, by which Fishes live, and by which they produce; but it is the transchange of food, proceeding from other Creatures, as I mentioned above. 'Tis true, Water is a proper element for them to live in, but not to live on; and though I have neither learning, nor experience in _Chymistry_, yet I believe, that your _Author_, with all the subtilest Art he had, could not turn or convert all Creatures into pure and simple water, but there would have been dregs and several mixtures left: I will not say, that the Furnace may not rarifie bodies extreamly, but not convert them into such a substance or form as Nature can. And although he thinks Gold is made of Water, yet I do not believe he could convert it into Water by the help of Fire; he might make it soluble, fluid and rare, but all things that are supple, soluble, flowing and liquid, are not Water; I am confident no _Gas_ or _Blas_ will, or can transform it, nor no Art whatsoever; what Nature may do, I know not. But since your _Authors_ opinion is, that Air is also a Primigenial Element, and in its nature a substance, Why doth he not make it a Principle of natural bodies, as well as Water? I think it had not been so improper to liken Juices to Water; but to make the onely Principle of the composition and dissolution of all Creatures to be Water, seems to me very improbable. Neither can I admit in reason that the Elements should be called, first, pure, and simple beings; we might as well call all other creatures, first, pure, and simple beings: for although the word Element sounds as much as Principle, yet they are in my reason no more Principles of Nature, then other Creatures are, there being but one Principle in Nature, out of which all things are composed, _viz._ the onely matter, which is a