HUMAN LIFE 



of war has been used, and is used today, 

 by others than Germans. 



The argument to which I have referred 

 is based on the assumption that natural 

 selection is the all-powerful factor, almost 

 the sole really important factor in organic 

 evolution. And that as man as an 

 animal species is subject to the control of 

 the same major evolutionary factors as 

 control the other animal kinds, his evolu- 

 tionary progress or fate is to be decided on 

 the basis of a rigid, relentless, natural 

 selection. It is the argument from a 

 post-Darwinian point of view that goes 

 much beyond Darwin's own concep- 

 tions. 



Natural selection itself, as you know, is 

 the outcome of a bitter and persistent 

 struggle for existence, in which struggle 

 the fittest or fitter survive while the less 

 fit become either much modified or ex- 

 tinguished. This struggle has three chief 

 phases. 



1. An inter-species struggle, or the 

 lethal competition among different animal 

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