Chap. I. APPENDIX. 



303 



I muft therefore fuppofe, at prefect, that no geometrical demon- 

 ftration of it can be given ; fo that, if it can be demonftrated, it muft 

 be by metaphyfics, or the firil philofophy ; and it muft be fnown 

 that Mind moves Body in the fame w^ay that Body moves Body, and 

 therefore is fubjeded to the fame laws of Motion, and, among other, 

 to this, that it can produce no Motion except in ftraight Hues, and 

 therefore cannot move Body in a circle or ellipfis, as, I fuppofe. Mind 

 can do, by changing the diredion of it in every inftant of the Mo- 

 tioq. And this naturally leads to an inquiry into the nature of Body 

 aa.d;Mind ; and, I think, it will be incumbent upon the gentlemen, 

 who, undertake to prove this prcpofiiion, tofhow that Body and Mind 

 are of the fame nature, and confequently operate in the fame man- 

 ner ; and, particularly, that Mind does not move Body, as Dr Clarke 

 and I fuppofe *, internally, and by ading upon every particle of ir, 

 but by external impulfe, as Body moves Body. 



Before I quit this article, I think, it will be proper to obferve 

 that, if the New^tonians with Vv'hom I converfe are right in this no- 

 tion of theirs, that the circular Motion is impoffible to be fimple, they 

 have the honour of the inveniion ; for not only no antient philo- 

 fopher or geometer ever thought of any fuch thing, but not even Sir 

 Ifaac Newton. For it is evident that, when he wrote his Principia, 

 he had no idea of the celeflial bodies being moved immediately and 

 diredly by Mind, (concerning which the only queftion is at pre- 

 fentj,, but by Bodily Impulfe, that being the only way perceived by 

 the Senfes, in which Motion is produced f. It was therefore necef- 

 fary that Sir Ifaac, when, he wrote his Principia, fliould maintain 

 that the Planetary Motion was combined, as Body can ad upon 

 Body in a ftraight line only, and therefore it was neccffary that 

 two Bodies fhould. ad upon the planets in different dlredions, in or- 

 der 



* r.cc the paflage quoted from Dr Clarke, quoted Vol. i. p. 512. 

 f Vol. i. p. 524. 525. 526.; Vol. ii. p. 323. 324. 



