22 ANTIENT METAPHYSICS. Bookl. 



With refpect to bodily motion^ it Is to be obferved, that It 

 cannot exift without change of place^ taken in the largeft lenfe ; 

 For, though there be no total change of the place of the thing, 

 as in the cafe of progrefTive motion, yet, where there is alteration, di- 

 minution, or augmentation, there muft neceiTarily be a change of 

 place, at leall of the parts ot the thing. So that change of place, of 

 one kind or another, is efl'ential to all kinds of bodily motion. But we 

 are not to take change of place, the firft member of the above divi- 

 fion, in that large fenfe ; but we muft underftand it only of a total 

 change of the fituation of the thing, which is exprefled by the Greek 

 word <p»^u, denoting carrying or transferring from one portion of fpace 

 to another. And, in this way underftood, the fjrft member of this 

 divifion will not comprehend the other three; for the thing that is 

 moved muft either change the fpace it occupies totally, or there muft 

 only be a change with refped to its parts. If it change totally, then 

 it is the firft kind of motion I mentioned ; but, if not totally, if the 

 motion^ for example, be only internal, fo that there is no more but a 

 tranfpolition of the parts of the thing, or if there be an addition to the 

 fpace the thing occupies, by an addition to its parts, then is there one 

 or other of the three motions above mentioned. 



Before I quit this fubje£l, I cannot help obferving, that Ariftotlehas, 

 I think, {hownagreatfuperiorlty above his mafter Plato, in treating this 

 fubje<5t of motion : For, in xhe frfi place, Plato has not thought pro- 

 per to give us any definition of it ; but, for that, has, like Mr Locke, 

 trufted to common fenfe and apprehenfion. Whether it was, that he 

 thought that fufficient, or that, according to his fyftem of ideas, there 

 could be no idea of motion^ not being a fubftance, nor having any 

 thing fixed or permanent. But, though he has not defined it, he has 

 divided it with great appearance of accuracy * ; for he has made no 

 lefs than ten different kinds of it. The firft is, that, where the motion 



is, 



• De Leglbug, Lib. lo. page 950. editio Ficini. 



