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  ORGANISM 
  AND 
  MECHANISM 
  

  

  theory 
  of 
  variability, 
  and 
  the 
  process 
  of 
  selection 
  is 
  more 
  than 
  

   mechanical 
  sifting. 
  The 
  evolving 
  organism 
  is 
  a 
  historical 
  psycho- 
  

   physical 
  being, 
  an 
  agency 
  trading 
  with 
  time; 
  and 
  the 
  humblest 
  

   creatures 
  are 
  in 
  their 
  mutations 
  creative. 
  

  

  The 
  conclusion 
  is 
  thus 
  arrived 
  at, 
  that 
  mechanical 
  formula 
  do 
  not 
  

   suffice 
  for 
  answering 
  biological 
  questions. 
  

  

  