﻿800 
  Fluctuations 
  

  

  strike 
  out 
  new 
  imitative 
  changes. 
  These 
  are 
  

   again 
  submitted 
  to 
  the 
  sifting 
  tests, 
  and 
  the 
  fre- 
  

   quent 
  repetition 
  of 
  this 
  process 
  is 
  considered 
  

   to 
  give 
  a 
  good 
  explanation 
  of 
  the 
  manifold, 
  

   highly 
  complicated, 
  and 
  admirable 
  structures 
  

   which 
  strike 
  the 
  beginner 
  as 
  the 
  only 
  real 
  adap- 
  

   tations 
  in 
  nature. 
  

  

  Exactly 
  in 
  the 
  same 
  way 
  artificial 
  selection 
  

   isolates 
  and 
  preserves 
  some 
  elementary 
  species, 
  

   while 
  it 
  destroys 
  others. 
  Of 
  course 
  the 
  time 
  is 
  

   not 
  sufficient 
  to 
  secure 
  new 
  mutations, 
  or 
  at 
  

   least 
  these 
  are 
  only 
  rare 
  at 
  present, 
  and 
  

   their 
  occurrence 
  is 
  doubtful 
  in 
  historic 
  periods. 
  

   Apart 
  from 
  this 
  unavoidable 
  difference 
  the 
  

   analog^ 
  7 
  between 
  natural 
  and 
  artificial 
  selection 
  

   appears 
  to 
  me 
  to 
  be 
  very 
  striking. 
  

  

  This 
  form 
  of 
  selection 
  mav 
  be 
  termed 
  selec- 
  

  

  / 
  

  

  tion 
  between 
  species. 
  Opposed 
  to 
  it 
  stands 
  the 
  

   selection 
  within 
  the 
  elementary 
  species 
  or 
  va- 
  

   riety. 
  It 
  has 
  of 
  late, 
  alone 
  come 
  to 
  be 
  known 
  as 
  

   selection, 
  though 
  in 
  reality 
  it 
  does 
  not 
  deserve 
  

   this 
  distinction. 
  I 
  have 
  already 
  detailed 
  the 
  

   historical 
  evidence 
  which 
  gives 
  preference 
  to 
  

   selection 
  between 
  species. 
  The 
  process 
  can 
  best 
  

   be 
  designated 
  by 
  the 
  name 
  of 
  intra-specific 
  se- 
  

   lection, 
  if 
  it 
  is 
  understood 
  that 
  the 
  term 
  intra- 
  

   specific 
  is 
  meant 
  to 
  apply 
  to 
  the 
  conception 
  of 
  

   small 
  or 
  elementary 
  species. 
  

  

  I 
  do 
  not 
  wish 
  to 
  propose 
  new 
  terms, 
  but 
  

  

  