﻿THE 
  PROBLEM 
  OF 
  BODY 
  AND 
  MIND 
  233 
  

  

  made 
  this 
  admission 
  we 
  must 
  advance 
  to 
  the 
  other 
  fact 
  that 
  

   evolution 
  of 
  brains 
  and 
  evolution 
  of 
  behaviour 
  have 
  pro- 
  

   ceeded 
  hand 
  in 
  hand, 
  in 
  intimate 
  correlation. 
  

  

  (c) 
  The 
  theory 
  we 
  frame 
  as 
  to 
  the 
  mind 
  and 
  body 
  relation 
  

   must 
  be 
  consistent 
  with 
  the 
  fact 
  of 
  their 
  functional 
  inter- 
  

   dependence. 
  We 
  express 
  one 
  side 
  of 
  this 
  inter-dependence 
  

   when 
  we 
  say, 
  " 
  the 
  spirit 
  is 
  willing, 
  but 
  the 
  flesh 
  is 
  weak 
  ", 
  

   which 
  suggests 
  the 
  picture 
  of 
  a 
  worn-out 
  instrument 
  unequal 
  

   to 
  the 
  player's 
  demands. 
  We 
  express 
  another 
  side 
  of 
  the 
  

   inter-dependence 
  when 
  we 
  say 
  of 
  our 
  friend 
  that 
  " 
  he 
  died 
  

   in 
  his 
  prime, 
  of 
  a 
  broken 
  heart, 
  having 
  lost 
  interest 
  in 
  life 
  ", 
  

   which 
  suggests 
  the 
  picture 
  of 
  a 
  strong 
  organisation 
  or 
  society 
  

   crumbling 
  away 
  because 
  of 
  the 
  resignation 
  of 
  one 
  who 
  was 
  

   its 
  heart 
  and 
  soul. 
  

  

  A 
  large 
  and 
  a 
  complex 
  brain 
  among 
  Vertebrates 
  is 
  cor- 
  

   related 
  with 
  a 
  dominance 
  of 
  intelligent 
  behaviour. 
  The 
  

   more 
  convolutions 
  the 
  greater 
  the 
  fulness 
  and 
  freedom 
  of 
  

   life. 
  An 
  intricate 
  brain 
  among 
  Arthropods 
  is 
  correlated 
  

   with 
  subtlety 
  of 
  instinctive 
  behaviour. 
  Thus 
  an 
  important 
  

   part 
  of 
  the 
  ant's 
  brain 
  is 
  big 
  in 
  the 
  worker, 
  smaller 
  in 
  the 
  

   queen, 
  and 
  almost 
  absent 
  in 
  the 
  drone. 
  Retardation 
  or 
  

   warping 
  of 
  the 
  development 
  of 
  the 
  nervous 
  system 
  is 
  as- 
  

   sociated 
  with 
  enfeeblement 
  or 
  disharmony 
  of 
  mental 
  life. 
  

   Fatigue, 
  or 
  poisoning, 
  or 
  degeneration 
  of 
  the 
  nervous 
  system 
  

   has 
  its 
  mental 
  correlate. 
  Injury 
  to 
  particular 
  areas 
  of 
  the 
  

   brain 
  may 
  bring 
  about 
  specific 
  changes 
  in 
  behaviour, 
  e.g., 
  

   disorders 
  of 
  speech. 
  It 
  seems, 
  for 
  instance, 
  that 
  an 
  area 
  

   at 
  the 
  base 
  of 
  the 
  third 
  convolution 
  on 
  the 
  left 
  side 
  of 
  the 
  

   brain 
  is 
  the 
  seat 
  of 
  the 
  impressions 
  and 
  processes 
  associated 
  

   with 
  remembrance 
  of 
  the 
  movements 
  of 
  articulation 
  ; 
  that 
  

   an 
  area 
  affecting 
  the 
  first 
  and 
  second 
  left 
  temporal 
  convolu- 
  

   tions 
  is 
  similarly 
  associated 
  with 
  memory 
  of 
  the 
  sound 
  of 
  

  

  