﻿Artificial 
  and 
  Natural 
  Selection 
  825 
  

  

  cousins. 
  In 
  every 
  group 
  the 
  best 
  adapted 
  in- 
  

   dividuals 
  will 
  survive, 
  and 
  soon 
  the 
  breeding- 
  

   differences 
  between 
  the 
  parents 
  must 
  vanish 
  

   altogether. 
  Manifestly 
  they 
  can, 
  as 
  a 
  rule, 
  

   have 
  no 
  lasting 
  result 
  on 
  the 
  issue 
  of 
  the 
  strug- 
  

   gle 
  for 
  existence. 
  

  

  If 
  now 
  we 
  remember 
  that 
  in 
  Darwin's 
  time 
  

   this 
  principle, 
  breeding-ability, 
  enjoyed 
  a 
  far 
  

   more 
  general 
  appreciation 
  than 
  at 
  present, 
  

   and 
  that 
  Darwin 
  must 
  have 
  given 
  it 
  full 
  consid- 
  

   eration, 
  it 
  becomes 
  at 
  once 
  clear 
  that 
  this 
  old, 
  

   but 
  recently 
  revived 
  principle, 
  is 
  not 
  adequate 
  

   to 
  support 
  the 
  current 
  comparison 
  between 
  ar- 
  

   tificial 
  and 
  natural 
  selection. 
  

  

  In 
  conclusion, 
  summing 
  up 
  all 
  our 
  arguments, 
  

   we 
  may 
  state 
  that 
  there 
  is 
  a 
  broad 
  analogy 
  be- 
  

   tween 
  breeding-selection 
  in 
  the 
  widest 
  sense 
  of 
  

   the 
  word, 
  including 
  variety-testing, 
  race-im- 
  

   provement 
  and 
  the 
  trial 
  of 
  the 
  breeding-ability 
  

   on 
  one 
  side, 
  and 
  natural 
  selection 
  on 
  the 
  other. 
  

   This 
  analogy 
  however, 
  points 
  to 
  the 
  impor- 
  

   tance 
  of 
  the 
  selection 
  between 
  elementary 
  spe- 
  

   cies, 
  and 
  the 
  very 
  subordinate 
  role 
  of 
  intra- 
  

   specific 
  selection 
  in 
  nature. 
  It 
  strongly 
  sup- 
  

   ports 
  our 
  view 
  of 
  the 
  origin 
  of 
  species 
  by 
  

   mutation 
  instead 
  of 
  continuous 
  selection. 
  Or, 
  

   to 
  put 
  it 
  in 
  the 
  terms 
  chosen 
  lately 
  by 
  Mr. 
  

   Arthur 
  Harris 
  in 
  a 
  friendly 
  criticism 
  of 
  my 
  

   views 
  : 
  ' 
  ' 
  Natural 
  selection 
  may 
  explain 
  the 
  sur- 
  

  

  