into which the watry steams of air may very easily be forced, which thereby will grow swell'd and extended; and a second, more hard and close, into which the wa∣ter cannot at all or very little penetrate; and this retain∣ing always the same dimensions, but the other stretch∣ing and shrinking, according as there is more or less water or moisture in its pores, 'tis thought to produce this unwreathing and wreathing. But that this kind of motion, whether it be caused by heat and cold, or by dryness and moisture, or by any greater or less force, proceeding either from gravity and weight, or from wind, which is the motion of the air, or from some spring∣ing body, or the like, should be the very first foot-step of sensation and animate motion, and the most plain, simple and obvious contrivance that Nature has made use of to produce a motion next to that of rarefaction and condensation by heat and cold, as their opinion is, I shall not easily be perswaded to believe; for if Ani∣mate motion was produced this way, it would, in my opinion, be but a weak and irregular motion. Nei∣ther can I conceive how these, or any other parts, could be set a moving, if Nature her self were not self∣moving, but onely moved: Nor can I believe, that the exterior parts of objects are able to inform us of all their interior motions; for our humane optick sense looks no further then the exterior and superficial parts of solid or dense bodies, and all Creatures have several corporeal figurative motions one within another, which