PHYSICAL AND LITERARY, j/3 



felf, any more than thefe other modes. 

 If the continuation of motion bore a 

 nearer refemblance to the continu- 

 ation of any other efFedt, would that 

 render it any plainer ? Motion is an 

 tScQ.fui generis ; but we have an infinite 

 variety of examples of its continuance. 

 An adive being prefTes forwards a certain 

 quantity of an ir^enetrable inadive fub- 

 ftance: Is there not fome efFedl produced 

 here? fomething then communicated to 

 it ? The l?ody is put in motion : Why 

 ought that motion to ceafe without a 

 caufe? Adlion is necelTary to the produc- 

 tion of motion, and no wonder if nothing 

 can deftroy the eftedl of one a<fl:ion but 

 another adtion. The trite mBLxinijJublata 

 caufa, tollitur effeBuSy is not to be fo literal- 

 ly interpreted, as that an effedl may not 

 continue, after its caufe ceafes to a(5l. 



As we know fo little of the nature of 

 that influence by which one being puts a- 

 ijother in motion, or by which it excites 

 motion in itfelf ; with what reafon can 

 we pofitively conclude its effcifts to be on- 



ly 



