and variety of knowledg, so that every particular figure and motion hath its particular knowledg, as well as its proper and peculiar parts; and as the parts join or divide, so doth knowledg, which many times causes Arts to be lost and found, and memory and remembrance in Particular Creatures: I do not say, they are utterly lost in nature, but onely in respect to particular Creatures, by the dissolving and dividing of their particular figures. For the rational matter, by reason it moves onely in its own parts, it can change and rechange into several figures without division of parts, which makes memory and remembrance: But men not considering or believing there might be such a degree of onely matter, namely rational, it has made them erre in their judgments. Nevertheless there is a difference between sensitive and rational parts and motions, and yet they are agreeable most commonly in their actions, though not always. Also the rational can make such figures as the sensitive cannot, by reason the rational has a greater power and subtiler faculty in making variety, then the sensitive; for the sensitive is bound to move with the inanimate, but the rational moves onely in its own parts; for though the sensitive and rational oftentimes cause each other to move, yet they are not of one and the same degree of matter, nor have they the same motions. And this rational Matter is the cause of all Notions, Conceptions, Imaginations, Deliberation, Determination, Memory, and any thing else that belongs to the Mind; for this matter is the mind of Nature, and so being dividable, the mind of all Creatures, as the sensitive is the life; and it can move, as I said, more subtilly, and more variously then the sensitive, and make such figures as the sensitive cannot, without outward examples and objects. But all diversity comes by change of motion, and motions are as sympathetical and agreeing, as antipathetical and disagreeing; And though Nature's artificial motions, which are her Playing motions, are sometimes extravagant, yet in her fundamental actions there is no extravagancy, as we may observe by her exact rules in the various generations, the distinct kinds and sorts, the several exact measures, times, proportions and motions of all her Creatures, in all which her wisdom is well exprest, and in the variety her wise pleasure: To which I leave her, and rest, Madam, _Your faithful Friend,_ _and Servant._ [1] _Of the Immortality of the Soul, l._ 2. _c._ 2. XIV. _MADAM,_