It may not perhaps seem improper here to explain some other abstruse principles in physics and metaphysics, from the meaning of vocables, as they too seem to explain the principles of rational grammar. There are, it seems, in physics, discoverable by the signification of words, three universal principles or genusses of things, namely, space, matter, and motion; which, as to their essences, if essence, nature, and quality differ in ought but form, are indefinable. But with respect to their modes, properties, and forms, space is distance every way, whether with or without body; with it, it is extension or capacity; without it, a vacuum; quantity, mensuration, number, place or matter extended, a continent, an island, length, breadth, figure, thickness, an inch, a foot, a yard and such things being its modes. Matter, whatever its essence may be, is an indivisible impenetrable atom or corpuscule; of which two or more assembled or cohered, form a particle, and larger cohesions or combinations of those form sensible bodies, which are chiefly distinguishable in language by their forms; though they have such properties and modes, as length, breadth, and thickness, or extension, solidity, or an assemblage excluding all other bodies from its place, divisibility or the separation of its quantity, mobility, passiveness, and figure, or that length and breadth without thickness, which present themselves to the eye. And as to the active qualities of matter, they seem to be all intentional, as fluidity, softness, rarity, heat, and other modes of motion; all the rest being passive, and arising merely from the different texture, disposition, and combination of bodies; or a privation of the former; as, firmness, hardness, density, coldness, dryness, and rest. Motion is the successive passage or change from once place or state to another. Of which there are three sorts expressible by language, viz. the energic, generative, and local; which with their various modes or actions are expressible by verbs.