THE NEWTONIAN PHILOSOPHY. 539 



in the fame body at difFerent times, yet, if we allow body to move 

 itfelf, we may allow it to move different ways, and with different degrees 

 of velocity. 



But, pio^ Whoever fays that body moves itfelf, confounds all di- 

 ftindlion betwixt body and Mind ; and, in effedl, fays, that there is 

 neither one nor other, but fome indefinable thing, which can have 

 no exiflence. When a thing is moved, there mufl be neceffarily 

 fomething that moves. If, therefore, body, after the pulfion has cea- 

 fed, is, of itfelf, and by its own nature and efTence, moved, there 

 mufl be fomething in it which moves it. Whatever moves, adts ; for, 

 to move, is to ad. There muft, therefore, be in the body a principle 

 of adivity j and, as the motion is of the nature and effence of the 

 body, this principle of adivity muft be effential to it. But body is, 

 by its nature and effence, entirely paffive and inadive : This the 

 Newtonians allow, and exprefs it 7iomine fign'ijicantijfimo^ as Sir Ifaac 

 fays, calling it 'vis inertiae : And fo body is both effentially a^ive, 

 and effentially maflive ; which is impofGble. 



But, what then is it that moves the body after the pulfion has cea- 

 fed ? And I fay it is that principle of motion which Ariftotle fays is 

 in all phyfical bodies, and which I call Mind, This principle, we 

 know, moves bodies various ways, fometimes up, fometimes down, 

 fometimes to the right, and fometimes to the left ; and the fame body 

 is moved in difFerent dircdlions, at different times, according to the po- 

 fition of the objedt toward which it is moved. Further—the principle is 

 Jatent in bodies, and does not exert itfelf, except upon particular oc- 

 cafions. Thus, the principle of motion in iron, by which it is moved 

 towards the magnet, does not exert itfelf but when the magnet is near ; 

 and then it ads in all diredions. And the fame is the cafe of the 

 chemical attradions j for the particles of filver do not feparate them- 



Y y y 2 felvei 



