CONDITIONS OF PROGRESS 



where circumstances have afforded such a heter- 

 ogeneous environment (as a perpetual external 

 excitant of internal rearrangements), the com- 

 munities which have survived through rela- 

 tively complete adjustment have manifested a 

 permanent capacity for progress. Thus is our 

 problem completely connected with the more 

 general problem of natural selection, and with 

 the most general problem of Evolution as mani- 

 fested in all orders of phenomena. And thus 

 the essential continuity of the processes of Na- 

 ture is again strikingly Illustrated. 



In the following chapter we shall have fre- 

 quent occasion to refer to this circumstance of 

 heterogeneity of the social environment as man- 

 ifested psychologically, In its effects upon the 

 intellectual mobility of men regarded as individ- 

 uals. To pursue the problem of progressive- 

 ness into this psychological region is the way in 

 which to obtain a basis for the explanation of 

 the progress from Brute to Man ; and to this 

 crowning inquiry we must now address our- 

 selves. 



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