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  ferent 
  countries 
  from 
  the 
  same 
  species. 
  The 
  

   repetition 
  obviously 
  indicates 
  a 
  common 
  inter- 
  

   nal 
  cause. 
  The 
  white 
  varieties 
  of 
  blue- 
  and 
  red- 
  

   flowered 
  plants 
  occur 
  in 
  the 
  wild 
  state 
  so 
  often, 
  

   and 
  in 
  most 
  of 
  the 
  instances 
  in 
  so 
  few 
  in- 
  

   dividuals 
  that 
  a 
  common 
  pedigree 
  is 
  absolutely 
  

   improbable. 
  In 
  horticulture 
  this 
  tendency 
  is 
  

   widely 
  and 
  vexatiously 
  known, 
  since 
  the 
  repeti- 
  

   tion 
  of 
  an 
  old 
  variety 
  does 
  not 
  bring 
  any 
  ad- 
  

   vantage 
  to 
  the 
  breeder. 
  The 
  old 
  name 
  of 
  

   " 
  conquests,' 
  given 
  by 
  the 
  breeders 
  of 
  hya- 
  

   cinths, 
  tulips 
  and 
  other 
  flower-bulbs 
  to 
  any 
  

   novelty, 
  in 
  disregard 
  of 
  the 
  common 
  occurrence 
  

   of 
  repetitions, 
  is 
  an 
  indication 
  of 
  the 
  same 
  ex- 
  

   perience 
  in 
  the 
  repeated 
  appearance 
  of 
  certain 
  

   varieties. 
  

  

  The 
  rule 
  of 
  parallel 
  variations 
  demands 
  that 
  

   the 
  same 
  character 
  occasionally 
  makes 
  its 
  ap- 
  

   pearance 
  in 
  the 
  several 
  varieties 
  or 
  races, 
  de- 
  

   scended 
  from 
  the 
  same 
  species, 
  and 
  even 
  in 
  

   widely 
  distinct 
  species. 
  This 
  is 
  a 
  rule, 
  which 
  

   is 
  very 
  important 
  for 
  the 
  general 
  conception 
  of 
  

   the 
  meaning 
  of 
  the 
  term 
  variety 
  as 
  contrasted 
  

   with 
  elementary 
  species. 
  For 
  the 
  recurrence 
  

   of 
  the 
  same 
  deviation 
  always 
  impresses 
  us 
  as 
  a 
  

   varietal 
  mark. 
  Laciniated 
  leaves 
  are 
  perhaps 
  

   the 
  most 
  beautiful 
  instance, 
  since 
  they 
  occur 
  in 
  

   so 
  many 
  trees 
  and 
  shrubs, 
  as 
  the 
  walnut 
  tree, 
  

   the 
  beech, 
  the 
  birch, 
  the 
  hazelnut, 
  and 
  even 
  in 
  

  

  