CONTENTS. 



The principal Motions that fall under cur Obf^rvation arc the Motions of the Cc- 

 leftial Bodies.— Thefe made to be entirely Mechanical by Sir Ifaac Newton, when 

 he wrote his 7'r;««>/^.- Some Alterations made in Sir Ifaac's Syftem by the later 

 Newtonians— but all agree that the ProgrelTive Motion of the Planet is carried on 

 without Mind ;—the only QMieftion, whether, by virtue of an Original Imptdfe, or 

 by virtue of a Vis Infita in the Planet ? -But the Vis Centrifuga of the Planet irre- 

 concileable with the Motion being by virtue of an Original Impulfe— therefore it 

 muft be by a Vis Infiia.^O^ the Beginning of the Progreffive Motion of the Planets. 

 —The Newtonians now admit it is by Mind— but it goes on by the Vis hijita^ 

 after the Energy of Mind has ceafed.— This a moft extraordinary Pofition.— 

 Suppofe the Body not projeded in a Straight Line, but beginning its Motion in 

 the Curve, examined what the Confequences will be—if the Motion will be ftill in 

 a Straight Line when the Vis Centripeta ceafes, with what Degree of Velocity is the 

 Motion carried on ?— The Confequence of giving an innate Power to Body, both 

 to begin and continue fuch Motions, is downright Materialifm.— A Conlequence 

 of the P'irft Law of Motion, that Body cannot go on in vacuo, by Prejure, but 

 only by //«/«f^.— The Motions of the Tides without Projeaion or Gravitation i 

 and, if by 2.Vis Inftta, that ^/i muft begin the Motion.— The whole Newtonian 

 Syftem depends upon the firil Law of Motion.— Of the Compofiticn of the Plane- 

 tary Mt^tion.— In order to prove this, the Newtonians muft prove one or other of 

 three Proporitions:—iw5, That it is impofiible, by the Nature of Things, it could 

 be fimple.— This a Geoa)etrical Problem, and, if true, capable of Demonftra- 

 tion.— If not demonftraied Geometrically, it ought to be demonftrated Metaphy- 

 fically.— Or, ido. They muft prove that the fame Motion, if produced by different 

 Caufe?, will not have the fame Properties. — Or, itio. They muft prove that all the 

 Bodies in our S -lar S)ftem gravitate towards one another.— The Proof from Ana- 

 logy here altogether deficient.— No Proo^ neither, from Fmal Caufes.— The De- 

 fcent of the Planet from the Tangent otherwife accounted for.— Of the Motion of 

 the Earth upon its Axis.— This explained in the fame Way as the Motion of a 

 Stone in a Sling. -If the Newtonian Syftem 'is laid afide, then mine muft take 

 place.— A ftiort Abridgment of it.— No Reafon for the Newtonians maintaining 

 fuch Paradox':s, except to demonftrate the Laws of the Planetary A-lotion.— This 

 can be done without them by an eafy Analyfis.— Anfwers to the Objcdion againft 

 Demonftratlon by Analyfis or Hypothefis.— If this Demonfi ration be good, then is 

 the Newtonian Svftcm cleared of many Difficulties and Abfurdities.— Thefe reck- 

 oned up.~The Newtonians ought to give up thefe, or to defend them by more 

 plaufible Arguments.— They ought to deal more in Dtftinaions than they have 



[A] 2 hitherto 



