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138 than that of Attraction, which is unintelligible.

Iaac might have anwer'd thee Criticks thus: Firt, you have as imperfect an Idea of the Word Impulion, as of that of Attraction; and in cae you cannot conceive how one Body tends towards the Center of another Body, neither can you conceive by what Power one Body can impell another.

, I cou'd not admit of Impulfion, for to do this, I mut have known that a celetial Matter was the Agent; but o far from knowing that there is any uch Matter, I have prov'd it to be merely imaginary.

, I ue the Word Attraction for no other Reaon, but to expres an Effect which I dicover'd in Nature; a certain and indiputable Effect of an unknown Principle; a Quality inherent in Matter, the Caue of which Perons of greater Abilities than I can pretend to, may, if they can, find out.

have you then taught us? Will thee People ay further: And to what