CONTENTS. 



BOOK V. 



Of the Principles of Sir Ifaac Newton's Aftronomy. 



CHAP. I. 



Of J/ironomy, and the DifFerence betwixt it and Philofopljy—Sir Ifaac Newton's Princi' 

 pia aWoric of Ajironomy, not Philofophy — Sir Ifaac, however, has philofophifed con- 

 cerning the Beginning and Continuation of Motion —If he is in an Error in this Philo- 

 fophy, it belongs to this Work to taice Notice of it — Short Account of Sir Ifaac' s 



Syjiem — The Motion of the Planets compofed of Projeiiion anJ Gravitation both thefe 



Powers a£ling in Right Lines— Their Eliiptical Motion, therefore, to be analyfed into 

 a Polygon of an infinite Number of Sides — ji> ^at thought that both the Motions 

 were produced by Bodily Impulfe —Re if ons for aflerting this to be his Opinion — Sir 

 Ifaac, when he wrote his Principia, did not thinkof Af/'Was a /Moving Power ■ — two 

 Reafons for that — Therefore made a Machine of the Heavens— Has laid it down that 

 Body is indifferent to a State of Motion or ReJ}—TW\s fubverfive of the antient Philo- 

 fophy of the Diftin£lion betwixt Mind and Body — Dangerous alfo to the Syflem of 

 Tbcifm, by denying the Providence of God over the Works of Nature — The Alecha- 

 nical Syflem cannot be confined to the Heavens, but muft defcend to the Earth— rrwxfk. 

 go even the Length of Dr. Pricf ley's Philofophy — But Sir Ifaac's Machine of the 

 Heavens, not a perfect Machine — liable to two Defers, which even Human Machi- 

 nery may be free of. p, ,16 



CHAP. II. 



Comparifon betwixt the antient and modern Materialifls — Sir Ifaac's Firji Law of Mo- 

 tion, the Foundation of all the Mechanical Philofophy of modern Times— Ought there- 

 fore to be moft carefully examined — That this Axiom fhould not be known to the 

 Antients, extraordinary — To judge of the Truth of it, belongs to the Firfi Philo- 

 fophy — Of the Nature of Motion ; — a Thing of conftant Change and Succejfon Refl, 



the oppofite of Motion — Improper, to apply the fame Terms, and draw the fame 

 Conclufions, concerning Oppofites — Other Improprieties of Expreflion by which 

 moving and being moved are confounded, and Vis Inertia applied to Body in a Stateof 

 ReJ} and in Motion— Of the feveral Ways in which the Motion can be fuppofcd to. be 

 carried on after the Impulfe has ceafed — Thefe are four — It is generally underflood 

 by the Newtonians to go on by virtue of one of thefe, viz. Impulfe— If fo. Sir Ifaac's 



Term 



