24 . A VIS INERTIAS

paragraph, it appears that it resists this mo-tion, as much as it would a motion in anyother direction, with the fame velocity : orthat matter is as much impelled in this cafe,as in any other, by some cause or virtue, abextra , t. e. by something not matter. Theeffect of gravity is not to destroy the resist-ance of matter, or to make it unresistingmatter, but to overcome its resistance to bemoved in certain circumstances; where itstill resists as much every new change ofstate, as if its resistance to the former hadnot been overcome. And this is the cafein all force impressed ab extra , by N° 13.When the resistance of the body A, to bemoved with a celerity as a 1000 times C,

communicate it to the person that r?ads, is of no use inphilosophy; or of bad use : but of such things Mr.Locke hath said enough. No man can conceive that thesame thing should be both movens and motum. Thereis a plain contradiction in this assertion, eadetnquesub -Jiantia corporis gravis , migrat & descendit , d seipso im-pulsa. A moved resists motion; a mover overcomes thatresistance: these opposites can never consist in the sameindividual thing. If the distinction of agent and patientis necessary in projeSHon , and percussion, and the effectsof art, it is also necessary in the works of nature. Twothings, necessarily two in the one cafe, cannot becomeent in the other.

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