THE NEWTONIAN PHILOSOPHY. 509 



CHAP. IL 



The ^eftton betwixt Sir Ifaac and the Antients Jlated — a ^leftion not 

 •within the Sphere of Mat hematics ^ but belon^rin^ to the F'lrjl Philofo^ 

 phy ; it relates to the Moving Poivers in the Uniuerfe — Thefe either 

 Mind or Body — Body moves Body only by ContaSl — therefore no fuch 

 Thin^ as iti ^flion in vacuo— 77?^ Manner in ivhieh Body moves 

 Body threefold — The Manner in vuhich Mind moves Body altogether 

 different — ivell dtjcnbed by Dr Clarke — The DiJlinSlion of the differ^ 

 gnt Kinds of Motion applied to the Solution of the ^leflion — According 

 to Sir Ifaac* s Hypothefis^ one Part of the Planetary Motion produced 

 hy Mind immediately ; other two Parts of it produced only mediately 

 by Mind — But all the Motions proved^ by Jundry Argw?ients, to be im- 

 mediately produced by Mind — Proje^ion and Gravitation fuch mere 

 Hypothefesj that fome Newtonians are difpojed to give them up ; but 

 they fay the Circular Motion has, hy its Nature y a Tendency both to atid 

 from the Center — Ihis Hypothefts examined in the next Chapter, 



TH E queftion, then, betwixt Sir Ifaac and his friend Dr Clarke, 

 (not to mention the Antients,) is, Whether the ceieftial bo- 

 dies are not altogether movfd by the continual agency of Mind ; or 

 whether, at leaft, one half of the motion is not produced by a force 

 once impreffed upon them, but continuing perpetually ? I his is the 

 queftion fairly Hated, according to the amendment made upon Sir I- 

 faac*b fyftem,. by his later tollowers. 



This is a qucRion that goes entirely out of the fnhcre of mathema- 

 tics into a philofophy, that Sir Ifaac does not appear to me ever to have 



ftudied ; 



