﻿Striped 
  Flowers 
  313 
  

  

  parts. 
  But 
  its 
  variability 
  is 
  restricted 
  to 
  this 
  

   group. 
  And 
  large 
  as 
  the 
  group 
  may 
  seein 
  on 
  

   first 
  inspection, 
  it 
  is 
  in 
  reality 
  very 
  narrow. 
  

   Many 
  monstrosities, 
  such 
  as 
  fasciated 
  branch- 
  

   es, 
  pitchers, 
  split 
  leaves, 
  peloric 
  flowers, 
  and 
  

   others 
  constitute 
  such 
  ever-sporting 
  varieties, 
  

   repeating 
  their 
  anomalies 
  year 
  by 
  year 
  and 
  gen- 
  

   eration 
  after 
  generation, 
  changing 
  as 
  much 
  as 
  

   possible, 
  but 
  remaining 
  absolutely 
  true 
  within 
  

   their 
  limits 
  as 
  long 
  as 
  the 
  variety 
  exists. 
  

  

  It 
  must 
  be 
  a 
  very 
  curious 
  combination 
  of 
  the 
  

   unit-characters 
  which 
  causes 
  such 
  a 
  state 
  of 
  

   continuous 
  variability. 
  The 
  pure 
  quality 
  of 
  the 
  

   species 
  must 
  be 
  combined 
  with 
  the 
  peculiarity 
  

   of 
  the 
  variety 
  in 
  such 
  a 
  way, 
  that 
  the 
  one 
  ex- 
  

   cludes 
  the 
  other, 
  or 
  modifies 
  it 
  to 
  some 
  extent, 
  

   although 
  both 
  never 
  fully 
  display 
  themselves 
  

   in 
  the 
  same 
  part 
  of 
  the 
  same 
  plant. 
  A 
  corolla 
  

   cannot 
  be 
  at 
  once 
  monochromatic 
  and 
  striped, 
  

   nor 
  can 
  the 
  same 
  part 
  of 
  a 
  stem 
  be 
  twisted 
  and 
  

   straight. 
  But 
  neighboring 
  organs 
  may 
  show 
  

   the 
  opposite 
  attributes 
  side 
  by 
  side. 
  

  

  In 
  order 
  to 
  look 
  closer 
  into 
  the 
  real 
  mechan- 
  

   ism 
  of 
  this 
  form 
  of 
  variability, 
  and 
  of 
  this 
  con- 
  

   stant 
  tendency 
  to 
  occasional 
  reversions, 
  it 
  will 
  

   be 
  best 
  to 
  limit 
  ourselves 
  first 
  to 
  a 
  single 
  case, 
  

   and 
  to 
  try 
  to 
  gather 
  all 
  the 
  evidence, 
  which 
  

   can 
  be 
  obtained 
  by 
  an 
  examination 
  of 
  the 
  he- 
  

   reditary 
  relations 
  of 
  its 
  sundry 
  constituents. 
  

  

  