THE NEWTONIAN PHILOSOPHY. 519 



CHAP. III. 



Upon the Siippofition of the Circular Motion beings by its Nature^ combi^ 

 tied of a Centripetal and a Centrifugal Force ^ no Occafion for the Hypo^ 

 thefis of Projeilion and Gravitation — Noneed^ alfo, for the Fir ft Laiv 

 of Motion — That every Motion in an Orbit is fb combined, not a Self- 

 evident Propo/ition, — altogether improbable, as the Moving Power is 

 one fimple Poiver — Sundry Rea/ons given vuhy it is impofjibk it fjjould 

 befo — Sirlfaac has proved nothing to the contrary — AH his Def nit ions ^ 

 Laivs of Motion^ and Demonfl rations^ concerning it, relate only to Mo" 

 tion produced by bodily Impulfe — Th^ Circular Motion, though produced 

 by Mind, may be rcfolved into the combined circular Motion of vohich 

 Sir Ifaacfpeaks — This fufficient for the Purpofe of Sir Jfaac's Philofo- 

 phy. 



AN D, in the/r/? place, I fliould be glad to know, if this dodrlne 

 be true, for what purpofe have the Newtonians fpoken fo much 

 about projedlon and gravitation, and 'founded their fcience upon hy- 

 pothefes, which appear now to be altogether unneceffary? 



idly^ I defire alfo to know for what purpofe they have laid it down, 

 in their firfl law of motion, that a body, once put in motion, does per- 

 petually continue in motion till it be flopped by external impediment, 

 a law which appears to me to be laid down by Sir Ifaac for no other 

 purpofe than to account for the planetary motion, upon the hypothe- 

 cs of projedion, which is now given up ? 



But, 



