HUMAN LIFE 



less natural, and of proved effectiveness, 

 which is based on the mutual aid principle 

 instead of the mutual murder principle, 

 and one which can be backed by all the 

 force of social inheritance to counteract 

 certain opposing influences of biological 

 inheritance, then war need be to him 

 neither inevitable nor desirable. 



The protagonists of inevitable war 

 declare that human nature does not 

 change. The biologist declares that 

 human nature does change both by 

 virtue of the influences of strictly 

 biological factors and especially, more 

 rapidly, by virtue of the influences of 

 social inheritance. Human nature to- 

 day, which is certainly not the same as 

 human nature in early Glacial Time, is 

 quite as much the resultant of the work 

 of social inheritance factors as it is of 

 factors of biological inheritance. Human 

 nature, not just the part that is in- 

 herited, but the whole of it, including 

 the part that is acquired by each gen- 

 eration, not only changes but can be made 

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