THE NEWTONIAN PHILOSOPHY. 511 



therefore, in 'uacuoy betwixt the fun and the planets that move round 

 him, or betwixt the moon and our earth and feavS, is a non-entity ab- 

 folutely inconceivable. And, therefore, as the word attra^ion denotes 

 the one body operating upon the other, in the way of drawing it to 

 it, and indeed it can denote nothing elfe, it ought to be laid afide al- 

 together ; and, in place of it, the word gra'uitation, or the tendency of 

 the bodies to one another, which is the way that Sir Ifaac himfelf 

 has explained gravitation, Ihould be ufed *. 



Body, therefore, can only move body by impulfe ; and this in two 

 ways ; either by the moving body propelling the other body; or by 

 drawing it to it, in the way that the weights in a balance weigh down 

 the fcale. The firft way is fubdivided into other two ; for, ei- 

 ther the body, propelling the other, continues in contad: with it, and 

 is carried along with it, and this way of body moving body may be 

 called trufton ; or the propelling body makes the other body change 

 its place, without following it, or continuing to be in contadl with it • 

 and this way of body moving body may be called piilfwn ; fo that 

 body moves body by draiving it to it, by trufton, or by pulfton. And 

 in thefe three ways only can body move body. 



When Mind moves body immediately, and without the interven* 

 tion of other bodies, it does it, I apprehend, in a manner quite differ- 

 ent. What that manner is, we cannot pofitively fay ; but, negatively, 

 we can fay that it does not move it by impulfe, as body moves body ; 

 for we cannot conceive that an immaterial fubftancc, without folidity 

 or refiftence, can impel any body, becaufe it is only by its folidity 

 and refiftence that body can impell or be iirpelled ; fo that, what is 

 not body, that is, what has not parts continuous and cohering, can 

 neither a6t nor fuffer in that manner. Further, as body can operate 



only 



* See more upon this fubje£i, page 185. i8(5. 



