X PREFACE. 



to inveftigaic the laws of the Planetary Motion, and from 

 them to deduce the phccnomena, what occafion was there to 

 inquire into the Caufe of the Motion, whether Body or Mind, 

 or both: Or whether it: had a beginning, or was from all 

 eternity ? and whether it is to continue through all eternity, 

 or to have an end ? for it is evident, that whatever way thefe 

 queftions are determined, the Motion, the Laws of the Mo- 

 tion, and the confequences deducible from them, will all be 

 the fame. Now, if Sir Ifaac or his followers, leaving their 

 Geometry and Mechanics, their Menfurations and Compu- 

 tations, have intrenched upon the province of the Philofo- 

 pher, and run their Science up to Metaphyfics, and I fay bad 

 Metaphyfics, maintaining Propofitions which, at the fame time 

 that they are of no ufe to them, are dangerous to the Reli- 

 gion of Nature, am I to blame, if, without going out of my 

 way, I have refuted thofe Propofitions ; or am I not rather to 

 be commended for endeavouring to place upon true Prin- 

 ciples fo valuable a Science, and which does fo much ho- 

 nour to this nation, and, 1 think, to modern times. 



After concluding the firft Volume of this Work, I propofed, 

 as I have faid in the Preface to it, to proceed to the noblcfl 

 Work of God, here below — Mati. But the Philofophy of Mind, 

 though it be truly the only Philofopliy % is fo little underflood 

 in this age, that without explaining it more, I perceived, that 

 what I was to fay of man could not be underflood ; much lefs 

 what would be neceilary to be faid, if I fliould live to carry 

 on the Work to God and Nature. I have therefore added 

 this Volume to my firft Part, in which I hope I have ex- 



* Page 457. 



plained 



