THENEWTONIAN PHILOSOPHY. 527 



gravitation, it is perfedly agreeable to the analogy and regularity of 

 nature, that It fhould follow the laws of the(e two powers, and, that 

 a circular motion, though produced by Mind, fhould have the fame 

 properties as a circular motion produced by bodily impulfe, in the 

 way that Sir Ifaac has defcribed it. And, in this way, that exad fimi- 

 larlty which Sir Ifaac has difcovered betwixt the motion of the planets 

 and of projediles on earth, and which, in my apprehenfion, is the 

 greateil difcovery that Sir liaac lias made, will be eafily accounted 

 for. 



CHAP. 



