iv MODERN EVOLUTION 181 



9. The instability of the homogeneous, which is 

 consequent upon the different exposures of the 

 different parts of any limited aggregate to incident 

 forces. 



The transformations hence resulting are: 



10. The multiplication of effects. Every mass 

 and part of a mass on which a force falls sub- 

 divides and differentiates that force, which there- 

 upon proceeds to work a variety of changes ; 

 and each of these becomes the parent of similarly- 

 multiplying changes; the multiplication of them 

 becoming greater in proportion as the aggre- 

 gate becomes more heterogeneous. And these 

 two causes of increasing differentiations are 

 furthered by 



11. Segregation, which is a process tending ever 

 to separate unlike units and to bring together like 

 units ; so serving continually to sharpen, or make 

 definite, differentiations otherwise caused. 



12. Equilibration is the final result of these 

 transformations which an evolving aggregate under- 

 goes. The changes go on until there is reached an 

 equilibrium between the forces which all parts of 

 the aggregate are exposed to and the forces these 

 parts oppose to them. 



Equilibration may pass through a transition 

 stage of balanced motions (as in a planetary system) 

 or of balanced functions (as in a living body) on the 

 way to ultimate equilibrium ; but the state of rest 

 in inorganic bodies, or death in organic bodies, 

 is the necessary limit of the changes constituting 

 evolution. 



1 3. Dissolution is the counter - change which 



