CHAPTER IV 



EMOTION 



AN environment is natural when the external 

 conditions and the natural impulses harmonize. 

 Acts are then so adjusted to conditions that 

 what is natural is also useful. Yet if the pre- 

 ceding argument is correct, usefulness is a re- 

 sult of naturalness and not its cause. The 

 acquired characters of one environment create 

 surplus energy which evokes new natural char- 

 acters, and these cause the descendants of those 

 who acquire them to leave the present environ- 

 ment, and enter one where the new characters 

 are advantageous. Usefulness, therefore, fol- 

 lows naturalness, and is the test through which 

 the possibility of permanent natural relations 

 between organisms and environment is de- 

 termined. 



No tendency to leave this natural environ- 

 ment arises, except through the acquisition of a 

 new group of characters creating new energy 



D 33 



