AND ITS SELF-CONSERVATION. 89 



be both extensive and intensive, these phases appear- 

 ing always as reciprocals. So that attraction and re- 

 pulsion are, in the first place, the initial and funda- 

 mental qualitative differences, constituting the reality of 

 matter, or the extended. And the varying relations 

 between these complementary phases of the extended 

 must involve the whole series of relations between exten- 

 sive and intensive quantity. 



At the same time, the transition in matter from the 

 state in which its quantity is predominantly extensive to 

 that in which the quantity is predominantly intensive 

 proves to be a process of qualitative evolution. That is, 

 the increase in the degree of strain between attraction 

 and repulsion within any given quantity of matter results 

 necessarily in the increased complexity of qualitative 

 manifestations within the matter. 



Attraction and repulsion, then, appear in the first 

 place as if merely qualitative; but as the complementary 

 phases of the extended they prove also to be quantitative, 

 while their varying quantitative relations under the re- 

 ciprocal forms of extensive and intensive quantity again 

 give rise to an infinitude of qualitative determinations. 

 So that quality and quantity prove to be but different 

 aspects of the same sum of facts in the physical universe. 

 And science has for its special mission to unfold into 

 explicit form the orderly representation of this entire 

 sphere of relations. 



A few illustrations, selected mainly from chemistry, 

 may serve to make clearer the truth of what we have just 

 been saying. 



It has already been more than once remarked in the 

 present inquiry that the condensation of a nebulous mass 



