THE LAW OF EVOLUTION CONTINUED. 391 



does it become sharply marked off from the space or matter 

 lying outside of it; and only as each separated division 

 draws into its mass those peripheral portions which are at 

 first imperfectly disunited from the peripheral portions of 

 neighbouring divisions, can it acquire anything like a precise 

 outline. That is to say, the increasing definiteness is a con- 

 comitant of the increasing consolidation, general and local. 

 While the secondary re-distributions are ever adding to the 

 heterogeneity, the primary re-distribution, while augment- 

 ing the integration, is incidentally giving distinctness to the 

 increasingly-unlike parts as well as to the aggregate of 

 them. 



But though this universal trait of Evolution is a neces- 

 sary accompaniment of the traits set forth in preceding- 

 chapters, it is not expressed in the words used to describe 

 them. It is therefore needful further to modify our for- 

 mula. The more specific idea of Evolution now reached is — 

 a change from an indefinite, incoherent homogeneity, to a 

 definite coherent heterogeneity, accompanying the dissipa- 

 tion of motion and integration of matter. 



