﻿MAR. 
  19, 
  1922 
  troland: 
  psychophysics 
  the 
  key 
  of 
  physics, 
  etc. 
  151 
  

  

  telligence. 
  I 
  will 
  speak 
  in 
  the 
  second 
  person 
  to 
  enforce 
  the 
  realism 
  of 
  

   the 
  argument 
  which 
  is 
  to 
  follow. 
  At 
  the 
  start 
  you, 
  the 
  naive 
  thinker, 
  

   divided 
  your 
  total 
  experience 
  into 
  internal 
  and 
  external 
  sections, 
  

   assigning 
  the 
  study 
  of 
  the 
  former 
  to 
  psychology 
  and 
  of 
  the 
  latter 
  to 
  

   physics. 
  At 
  first 
  you 
  regarded 
  the 
  whole 
  of 
  your 
  external 
  experience 
  

   as 
  forming 
  part 
  of 
  a 
  world 
  which 
  existed 
  independently 
  of 
  your 
  ex- 
  

   perience, 
  but 
  as 
  you 
  progressed 
  in 
  your 
  physical 
  thinking 
  you 
  found 
  

   that 
  more 
  and 
  more 
  factors 
  in 
  your 
  external 
  experience 
  failed 
  to 
  meas- 
  

   ure 
  up 
  to 
  the 
  demands 
  of 
  this 
  belief 
  and 
  hence 
  had 
  to 
  be 
  rejected 
  from 
  

   the 
  subject 
  matter 
  of 
  your 
  physical 
  science. 
  Eventually 
  you 
  retained 
  

   only 
  space, 
  mass, 
  and 
  time, 
  substituting 
  complications 
  of 
  these 
  for 
  

   all 
  other 
  empirical 
  factors, 
  but 
  then 
  Einstein 
  appeared 
  upon 
  the 
  scene 
  

   and 
  proved 
  to 
  you 
  that 
  these 
  also 
  could 
  not 
  be 
  conceived 
  to 
  exist 
  

   unmodified 
  apart 
  from 
  your 
  own 
  experience. 
  You 
  then 
  found 
  your- 
  

   self 
  in 
  the 
  predicament 
  of 
  having 
  built 
  up 
  a 
  highly 
  specific 
  and 
  intricate 
  

   logical 
  system, 
  to 
  the 
  component 
  terms 
  of 
  which 
  you 
  eould 
  no 
  longer 
  

   attach 
  any 
  imaginable 
  meaning. 
  This 
  logical 
  system, 
  written 
  in 
  

   symbols 
  in 
  your 
  books, 
  still 
  purported 
  to 
  refer 
  to 
  a 
  real 
  external 
  uni- 
  

   verse, 
  but 
  what 
  that 
  universe 
  could 
  be 
  like 
  in 
  itself 
  was 
  a 
  question 
  

   which 
  you 
  now 
  found 
  yourself 
  quite 
  unable 
  to 
  answer. 
  To 
  say 
  that 
  

   its 
  ultimate 
  substance 
  is 
  electricity 
  would 
  merely 
  be 
  to 
  confess 
  im- 
  

   plicitly 
  that, 
  although 
  you 
  knew 
  something 
  about 
  it, 
  you 
  knew 
  nothing 
  

   at 
  all 
  of 
  it. 
  

  

  In 
  this 
  situation 
  you 
  seem 
  about 
  to 
  admit 
  your 
  complete 
  ignorance 
  

   of 
  the 
  nature 
  of 
  any 
  reality 
  apart 
  from 
  your 
  own 
  immediate 
  experience. 
  

   But 
  if 
  you 
  will 
  ponder 
  a 
  moment 
  you 
  will 
  find 
  already 
  resident 
  in 
  

   your 
  thought 
  a 
  very 
  potent 
  belief 
  in 
  the 
  existence 
  of 
  certain 
  realities 
  

   apart 
  from 
  your 
  experience, 
  but 
  realities 
  which 
  are, 
  in 
  general, 
  quite 
  

   different 
  from 
  any 
  part 
  of 
  the 
  physical 
  world. 
  The 
  realities 
  in 
  ques- 
  

   tion 
  are 
  the 
  consciousnesses, 
  or 
  experiences, 
  of 
  other 
  men. 
  These 
  

   you 
  suppose 
  to 
  be 
  similar 
  in 
  character 
  to 
  your 
  own 
  consciousness 
  

   but 
  nevertheless 
  to 
  be 
  quite 
  separable 
  from 
  the 
  latter 
  and 
  to 
  be 
  en- 
  

   tirely 
  independent 
  of 
  it 
  for 
  their 
  continued 
  existence. 
  In 
  order 
  again 
  

   to 
  lend 
  realism 
  to 
  the 
  argument 
  I 
  will 
  take 
  as 
  an 
  example 
  of 
  other 
  

   consciousness 
  my 
  own 
  experience 
  contrasted 
  with 
  yours. 
  Suppose 
  

   now 
  that, 
  having 
  become 
  interested 
  in 
  consciousness, 
  you 
  become 
  a 
  

   psychophysiologist 
  and 
  work 
  out 
  the 
  relationship 
  which 
  must 
  be 
  

   conceived 
  to 
  exist 
  between 
  my 
  consciousness, 
  or 
  experience, 
  and 
  your 
  

   symbolic 
  physical 
  world. 
  You 
  will 
  find, 
  as 
  we 
  have 
  seen, 
  that 
  my 
  

  

  