I should also explain why and how I made rest [Errata: Rest] to be, though not so considerable a Principle of things, as Motion, yet a Principle of them; partly because it is (for ought we know [Errata: know)] as Ancient at least as it, and depends not upon Motion, nor any other quality of matter; and partly, because it may enable the Body in which it happens to be, both to continue in a State of Rest till some external force put it out of that state, and to concur to the production of divers Changes in the bodies that hit against it, by either quite stopping or lessning their Motion (whilst the body formerly at Rest Receives all or part of it into it self) or else by giving a new Byass, or some other Modification, to Motion, that is, To the Grand and Primary instrument whereby Nature produces all the Changes and other Qualities that are to be met with in the World. I should likewise, after all this, explain to you how, although Matter, Motion and Rest, seem'd to me to be the Catholick Principles of the Universe, I thought the Principles of Particular bodies might be Commodiously enough reduc'd to two, namely _Matter_, and (what Comprehends the two other, and their effects) the result or Aggregate [Errata: Aggregate or complex] of those Accidents, which are the Motion or Rest, (for in some Bodies both are not to be found) the Bigness, Figure, Texture) [Errata: delete )] and the thence resulting Qualities of the small parts) [Errata: delete )] which are necessary to intitle the Body whereto they belong to this or that Peculiar Denomination; and discriminating it from others to appropriate it to a Determinate Kind of Things, as [Errata: (as] Yellowness, Fixtness, such a Degree of Weight, and of Ductility, do make the Portion of matter wherein they Concur, to be reckon'd among perfect metals, and obtain the name of Gold.) Which [Errata: This] Aggregate or result of Accidents you may, if You please, call either _Structure_ or Texture. [Errata: no paragraph break] Though [Errata: (Though] indeed, that do not so properly Comprehend the motion of the constituent parts especially in case some of them be Fluid [Errata: Fluid)], or what other appellation shall appear most Expressive. Or if, retaining the Vulgar Terme, You will call it the _Forme_ of the thing it denominates, I shall not much oppose it; Provided the word be interpreted to mean but what I have express'd, and not a Scholastick _Substantial Forme_, which so many intelligent men profess to be to them altogether Un-intelligible.