I am of your _Authors_ opinion, concerning self-activity or self-motion,[1] _That what is Active of it self, can no more cease to be active then to be_: And I have been always of this opinion, even from the first beginning of my conceptions in natural Philosophy, as you may see in my first Treatise of Natural Philosophy, which I put forth eleven years since; where I say, That self-moving Matter is in a Perpetual motion; But your _Author_ endeavors from thence to conclude, That _Matter is not self active, because it is reducible to rest._ To which I answer, That there is no such thing as Rest in Nature: Not do I say, that all sorts of motions are subject to our senses, for those that are subject to our sensitive Perceptions, are but gross Motions, in comparison to those that are not subject to our exterior senses: as for example; We see some bodies dilate, others consume, others corrupt; yet we do not see how they dilate, nor how they consume, nor how they corrupt: Also we see some bodies contract, some attract, some condense, some consist, &c. yet we do not see their contracting, attracting, condensing, consisting or retenting motions; and yet we cannot say, they are not corporeal motions, because not subject to our exterior senses; for if there were not contracting, attracting, retenting or consistent corporeal self-motions, it had been impossible that any creature could have been composed into one united figure, much less stayed and continued in the same figure without a general alteration. But your _Author_ says, _If Matter, as Matter, had Motion, nothing would hold together, but Flints, Adamants, Brass, Iron, yea, this whole Earth, would suddenly melt into a thinner substance then the subtil Air, or rather it never had been condensated together to this consistency we find it._ But I would ask him, what reason he can give, that corporeal self-motion should make all matter rare and fluid, unless he believe there is but one kind of motion in Nature, but this, human sense and reason will contradict; for we may observe there are Infinite changes of Motion, and there is more variety and curiosity in corporeal motions, then any one single Creature can imagine, much less know; but I suppose he conceives all corporeal matter to be gross, and that not any corporeal motion can be subtil, penetrating, contracting and dilating; and that whatsoever is penetrating, contracting and dilating, is Individable: But by his leave, _Madam_, this doth not follow; for though there be gross degrees of Matter, and strong degrees of Corporeal Motions, yet there are also pure and subtil degrees of Matter and Motions; to wit, that degree of Matter, which I name sensitive and rational Matter, which is natural Life and Knowledg, as sensitive Life and rational Knowledg. Again, your _Author_ askes, _What glue or cement holds the parts of hard matter in Stones and Metals together?_ I answer, Consistent or retentive corporeal motions, by an