﻿PREFACE. 
  Vll 
  

  

  can 
  only 
  be 
  reached 
  by 
  new 
  arguments 
  

   and 
  by 
  new 
  methods 
  of 
  proof. 
  

  

  Many 
  of 
  the 
  questions 
  which 
  are 
  in- 
  

   volved 
  in 
  the 
  reasoning 
  of 
  this 
  Essay, 
  

   are 
  questions 
  which 
  touch 
  upon 
  the 
  pro- 
  

   foundest 
  problems 
  of 
  our 
  nature 
  and 
  of 
  

   our 
  history 
  : 
  — 
  On 
  the 
  connection, 
  seem- 
  

   ingly 
  inseparable, 
  between 
  all 
  mental 
  

   phenomena 
  and 
  physical 
  organization 
  ; 
  on 
  

   the 
  truthfulness 
  of 
  any 
  system 
  of 
  classifi- 
  

   cation 
  which 
  does 
  not 
  take 
  equal 
  cogni- 
  

   zance 
  of 
  both; 
  on 
  the 
  distinction 
  between 
  

   intellectual 
  powers 
  and 
  moral 
  character; 
  

   on 
  the 
  distinction, 
  again, 
  between 
  the 
  

   mere 
  results 
  of 
  accumulated 
  knowledge, 
  

   and 
  the 
  working 
  of 
  the 
  original 
  facul- 
  

  

  