Infinite Nature: and as the Motions of Nature's life make diseases or irregularities, so they make that which man names dregs and filths; which dregs, filths, sickness, and death, are nothing but changes of corporeal motions, different from those motions or actions that are proper to the health, perfection and consistence of such or such a figure or creature. But, to conclude, there is no such thing as corruption, sickness, or death, properly in Nature, for they are made by natural actions, and are onely varieties in Nature, but not obstructions or destructions of Nature, or annihilations of particular Creatures; and so is that we name Superfluities, which bear onely a relation to a particular Creature, which hath more Motion and Matter then is proper for the nature of its figure. And thus much of this subject for the present, from, Madam, _Your faithful Friend_ _and humble Servant._ [1] _Ch._ Call'd the Authors answers. [2] _Ch._ Of the subject of inhering of diseases. [3] _Ch._ The subject of inhering of diseases is in the point of life. _It. Ch._ Of the knowledg of diseases. XXVII. _MADAM,_ In my last, I remember, I told you of your _Authors_ opinion concerning the seat of Diseases, _viz._ that Diseases are properly in living bodies, and consist in the life it self; but when I consider his definition of Life, and of a Disease, I cannot conceive how they should consist together; for he describes[1] _a Disease to be a real, material and substantial being, truly subsisting in a body; but life to be a meer nothing, and_ _yet the immediate mansion of a disease, the inward subject, yea, and workman of the same; and that with the life all diseases depart into nothing._ Surely, _Madam_, it exceedeth my understanding; for, first, I cannot conceive how life, which is a meer Nothing, can be a lodging to something? Next, how Nothing can depart and die? and thirdly how Something can become Nothing? I think your _Author_ might call a dead Carcass as well No-thing, as Life; and since he names Diseases the Thieves of Life, they must needs be but poor Thieves, because they steal No-thing. But your _Author_ compares Life to Light, and calls it an Extinguishable Light, like the light of a Candle; which if so, then the old saying is verified, That life goes out like the snuff of a Candle. But I wonder, _Madam_, that grave and wise men will seriously make use of a similising old Proverb, or of a Poetical Fancy, in matter of natural Philosophy; for I have observed, that _Homer, Lucian, Ovid, Virgil, Horace,_ &c. have been very serviceable to great Philosophers, who have taken the ground of their Fictions, and transferred them into Natural Philosophy, as Immaterial substances, Non-beings, and many the like; but they can neither do any good nor hurt to Nature, but onely spoil Philosophical Knowledg; and as Nature is ignorant of Immaterials and Non-beings, so Art is ignorant of Nature; for Mathematical Rules, Measures, and Demonstrations,