SPENCER'S FORMULA OF EVOLUTION. Ill 



lution. What is the difference ? Where shall we find 

 a law to condition this of increasing differentiation ? 



Spencer's return to the doctrine of individuation, 

 expounded in " Social Statics." Individuation must 

 involve unification. Reinstatement of the doctrine of 

 unification in Spencer's thought. Evolution : increase 

 of heterogeneity along with increase in unification. 

 Change towards complexity is change in the line of 

 Evolution only where increase of complexity does not 

 break up or jeopardize the organic unity of the aggre- 

 gate. In Evolution increasing specialization of parts 

 must be accompanied by increasing mutual depend- 

 ence of parts in a coherent whole. 



Full formula thus reached : Evolution is a change 

 from an indefinite, incoherent homogeneity, to a defi- 

 nite, coherent heterogeneity, through successive dif- 

 ferentiations and integrations. 



Criticism of this formula. Applications of it to 

 the phenomena of biology, psychology, sociology, and 

 ethics. 



