Chap. VI. ANTIE^^IT METAPHYSICS. 407 



tion — Better to acknowledge our Ignorance than make Jlrange and 

 improbable Suppofitions. — Our Ignorance viujl be acknowledged in ma- 

 ny other things, of which -we can wake no Syjlcm. — But Sir Ifaac 

 has made a Syjlem of AJironomy. — This Syjicm to be fupported with- 

 out -the a&ual Compofition of lue Planetary Motion. — The HyprAhefts 

 offuch a Compofition f efficient. — This Hypothefis mofl natural. — // w 

 according to the Method of Science, and particularly accordiw^ to 

 EuclidV Method.— If the Hypothefts of a Centripetal Force be ad- 

 mitted, the Hypothefis of a Projedtlle Force /// the Line of the Tan- 

 gont, abfolntely neceffary. — The neceffary ConnecSlion betwixt thcfe 

 two Afotions, and their Dependency upon one another. — The one 

 being given, therefore the other is given. — The Moving Force /// 

 the Line of ProjeBion isfjewn to have a relation to the Di/lanct' 



from the Centre, as well as the Centripetal Motion What that 



Relation is. — The DeduBion from any Hypothefis, if that Hypothefis 

 be granted, as certain from the Reality. — Example of the like De- 

 duction from an Hypothefis notfo obvious and natural, in the Cafe of 

 the Compofition of Motion. — From that Example the Argument of 

 the Newtonians anfwered, that the fame EfFedt mufl be always pro- 

 duced by the fame Caufe. 



IN the preceding Chapters, I hope I have proved, to the fatisfac- 

 tion of my readers, that the Planets are moved by an internal 

 Principle, which, being immaterial, I call Mind. By this principle 

 very many Motions are begun and carried on in this our earth : 

 though there be alio many other Motions here, which are carried on 

 by the inipulfc or preflure of Body : But this, I think I have fhown, 

 is of abfolute necelTity where there are fo many Bodies juftling and 

 interfering with one another, but cannot take place in the Celeftial 

 Regions, where, as Sir Ifaac has faid. Corpora liberrime moventur ; 

 fo that there the only moving Principle mufl; be Mind. This prin- 

 ciple 



