Chap. III. ANTIENT METAPHYSICS. 21 



This leads me to the dlvifion of motion given by Arlflotle, and 

 which naturally follows its definition. It is taken from the efF;ds 

 which it produces, and, according to him, is o^ four kinds, and I elongs 

 to three categories, viz. quality, quantity^ and ivhere. The firH: kind 

 is that well known motion from place to place^ which falls under the 

 category laft mentioned ; the fecond is alteration^ by which the 

 quality of any thing is changed, the fubftance remaining the fame. 

 This belongs to the category of quality. The third is increafe, and 

 the fourth diminution^ both belonging to the category of quantity. 



The definition of motion above given is fuch, that it will apply, at 

 leaft in one refped, to mind as well as body. And the divifion now 

 given fhows what that one refpedt is, viz. quality. For it cannot be 

 denied, that inferior minds, fuch as ours, change in quality ; and, as 

 that change does not happen at once, but by progrejfton, that pro- 

 grefllon is the motion applicable to mind; and, accordingly, in com- 

 mon language, we fay, that our minds are monjed, or altered ; that is, 

 have changed their quality. But, with refpedt to the other three 

 kinds of fnotion, which fall under the two categories of quantity and 

 ivhere^ it is impoflible to conceive, that immaterial fubflances, having 

 no parts, and being indivifible, can be monjcd any of thcfe ways. 



And, therefore, though, when our body monjes, the mind may be 

 faid to move with it ; that is only x«t<» <rv^Z%%AK6u or by the accident of 

 its junction with the body j but not -^ui" dur,, or by its own nature, as A- 

 riftotle has very well diifinguifhed *. It is, however, true, that when 

 philofophers fpeak of motion, it is always, to be underftood of body, 

 unlefs they have otherways explained their meaning f. 



With 



* De Anima, lib. i. cap. 3. 



f As this motion of the mind may anpear to many very unph-lofophical, fee what 

 Phiicponup has fa.d upon the id hook of Arlftut'e yn^t 4'rxn<:- tov/iirvis he rrWMle of 



the bock, at thele words, Tr^eJTO) fiU ouv *? rov ayrou ovro<; rou -rxT^ii", xxi rov *itt.6<!«j<, xui 



TO'j f^i^yiiSf, &c. where he fays cxprefsly, thnf fty^'^t';, or Uiin'u.f^, -/hich is the change of 

 the mind from a flate of ignorance or error to knowledge, is motion. 



