84 MENTAL EVOLUTION IN MAN. 



genesis from the lower faculties of mind. As we have now 

 seen, it is on all hands agreed that the one and only distinction 

 between human and animal psychology consists in the former 

 presenting this faculty which, otherwise stated, means, as we 

 have likewise seen, the power of translating ideas into symbols, 

 and using these symbols in the stead of ideas. 



This, I say, is the one distinction upon which all are 

 agreed ; the only question is as to whether it is a distinction 

 of kind or of degree. Since the time when the ancient Greeks 

 applied the same word to denote the faculty of language and 

 the faculty of thought, the philosophical propriety of the iden- 

 tification has become more and more apparent. Obscured as 

 the truth may have become for a time through the fogs of 

 Realism, discussion of centuries has fully cleared the philo- 

 sophical atmosphere so far as this matter is concerned. 

 Hence, in these latter days, the only question here presented 

 to the evolutionist is — Why has no mere brute ever learnt to 

 communicate with its fellows } Why has man alone of ani- 

 mals been gifted with the Logos t To answer this question 

 we must undertake a somewhat laborious investigation of the 

 philosophy of Language. 



