| It is surprising after the solemn protestations Sir Isaac made that such eminent men as Mr Sorin and Mr de Fontenelle should have imputed to this great philosopher the verbal and chimerical way of reasoning of the Aristotelians Mr Sorin in the Memoirs of the Academy of and Mr de Fontenelle in the very eulogium of Sir Isaac Newton Most of the French the learned and others have repeated this reproach These are for ever crying out Why did he not employ the word iMPULSION which is so well understood rather than that of ATTRACTION which is unintelligible | ||
| Sir Isaac might have answered these critics thus First you have as imperfect an idea of the word impulsion as of that of attraction and in case you cannot conceive how one body tends towards the centre of another body neither can you conceive by what power one body can impel another Secondly I could not admit of impulsion for to do this I must have known that a celestial matter was the agent But so far from knog that there is any such matter I have proved it to be merely imaginary Thirdly I use the word attraction for no other reason but to express an effect which I discovered in Naturea certain and indisputable effect of an unknown principlea quality inherent in matter the cause of which persons of greater abilities than I can pretend to may if they can find out What have you then taught us will these people say further and to what purpose are so many calculations to tell us what you yourself do not comprehend I have taught you may Sir Isaac rejoin that all bodies gravitate towards one another in proportion to their quantity of matter that these central forces alone keep the planets and comets in their orbits and cause them to move in the proportion before set down I demonstrate to you that it is impossible there should be any other cause which keeps the planets in their orbits than that general phenomenon of gravity For heavy bodies fall on the earth according to the | ||
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