144 THE THEORY OF EVOLUTION 



without hesitation that in the realm of the living there 

 exist the most manifold grades of perfection, for it is 

 certainly no ' illusion ' (Tauschung) if ' in the case of 

 certain organic creatures we cannot mentally separate 

 the values which we are accustomed to associate with 

 their existence ' (p. 6). ' More perfect ' and ' more im- 

 perfect ' instruments there will always be, even if 

 both kinds of tools are quite well fitted for their 

 temporary uses. 



