﻿Balanced 
  Crosses 
  285 
  

  

  this 
  species 
  and 
  its 
  white 
  variety 
  has 
  a 
  blue 
  

   corolla. 
  But 
  occasionally 
  it 
  produces 
  some 
  

   purely 
  white 
  flowers, 
  showing 
  its 
  power 
  of 
  sep- 
  

   arating 
  the 
  parental 
  heritages, 
  combined 
  in 
  its 
  

   internal 
  structures. 
  This 
  reversion 
  is 
  not 
  com- 
  

   mon, 
  but 
  in 
  thousands 
  of 
  flowering 
  spikes 
  one 
  

   may 
  expect 
  to 
  find 
  at 
  least 
  one 
  of 
  them. 
  Some- 
  

   times 
  it 
  is 
  a 
  whole 
  stem 
  springing 
  from 
  the 
  

   underground 
  system 
  and 
  bearing 
  only 
  white 
  

   flowers 
  on 
  all 
  its 
  spikes. 
  In 
  other 
  instances 
  it 
  

   is 
  only 
  a 
  side 
  branch 
  which 
  reverts 
  and 
  forms 
  

   white 
  flowers 
  on 
  a 
  stem, 
  the 
  other 
  spikes 
  of 
  

   which 
  remain 
  bluish. 
  Sometimes 
  a 
  spike 
  even 
  

   differentiates 
  longitudinally, 
  bearing 
  on 
  one 
  side 
  

   blue 
  and 
  on 
  the 
  other 
  white 
  corollas, 
  and 
  the 
  

   white 
  stripe 
  running 
  over 
  the 
  spike 
  may 
  be 
  seen 
  

   to 
  be 
  long 
  and 
  large, 
  or 
  narrow 
  and 
  short 
  in 
  

   various 
  degrees. 
  In 
  such 
  cases 
  it 
  is 
  evident 
  

   that 
  the 
  heritages 
  of 
  the 
  parents 
  remain 
  un- 
  

   influenced 
  by 
  each 
  other 
  during 
  the 
  whole 
  life 
  of 
  

   the 
  hybrid, 
  working 
  side 
  by 
  side, 
  but 
  the 
  active 
  

   element 
  always 
  prevails 
  over 
  its 
  latent 
  opponent 
  

   which 
  is 
  ready 
  to 
  break 
  free 
  whenever 
  an 
  oppor- 
  

   tunity 
  is 
  offered. 
  

  

  It 
  is 
  now 
  generally 
  assumed 
  that 
  this 
  incom- 
  

   plete 
  mixture 
  of 
  the 
  parental 
  qualities 
  in 
  a 
  hy- 
  

   brid, 
  this 
  uncertain 
  and 
  limited 
  combination 
  is 
  

   the 
  true 
  cause 
  of 
  the 
  many 
  deviations, 
  exhibited 
  

   by 
  varietal 
  hybrids 
  when 
  compared 
  with 
  their 
  

  

  