Though Matter can be neither more nor less than Matter; yet there may be degrees of Matter, as _more pure_, or _less pure_; and yet the purest Parts are as much material, in relation to the nature of Matter, as the grossest: Neither can there be more than two sorts of Matter, namely, that sort which is Self-moving, and that which is not Self-moving. Also, there can be but two sorts of the Self-moving Parts; as, that sort that moves intirely without Burdens, and that sort that moves with the Burdens of those Parts that are not Self-moving: So that there can be but these three sorts; Those parts that are not moving, those that move free, and those that move with those parts that are not moving of themselves: Which degrees are (in my opinion) the Rational Parts, the Sensitive Parts, and the Inanimate Parts; which three sorts of Parts are so join'd, that they are but as one Body; for, it is impossible that those three sorts of Parts should subsist single, by reason Nature is but one united material Body. CHAP. IV. Of VACUUM. In my opinion, there cannot possibly be any _Vacuum_: for, though Nature, as being material, is divisible and compoundable; and, having Self-motion, is in perpetual action: yet Nature cannot divide or compose _from_ her self, although she may move, divide, and compose in her self: But, were it possible Nature's Parts could wander and stray in, and out of _Vacuum_, there would be a Confusion; for, where Unity is not, Order cannot be: Wherefore, by the Order and Method of Nature's corporeal Actions, we may perceive, there is no _Vacuum_: For, what needs a _Vacuum_, when as Body and Place is but one thing; and as the Body alters, so doth the Place? CHAP. V. The difference of the Two Self-moving Parts of Matter.