﻿420 
  Ever-sporting 
  Varieties 
  

  

  and 
  mercury 
  (Mercurialis 
  annua) 
  among 
  the 
  

   first, 
  snapdragon, 
  poppies, 
  Phacelia, 
  Helich- 
  

   rysum, 
  and 
  Clarkia 
  among 
  garden-flowers 
  may 
  

   be 
  given 
  as 
  instances 
  of 
  species 
  containing 
  the 
  

   rich 
  tricotylous 
  double 
  races. 
  

  

  It 
  is 
  very 
  interesting 
  to 
  note 
  how 
  strong 
  the 
  

   difference 
  is 
  between 
  such 
  cases 
  and 
  those 
  which 
  

   only 
  yield 
  poor 
  races. 
  The 
  rich 
  type 
  at 
  once 
  

   betrays 
  itself. 
  No 
  repeated 
  selection 
  is 
  re- 
  

   quired. 
  The 
  stray 
  tricotyls 
  themselves, 
  that 
  

   are 
  sought 
  out 
  from 
  among 
  the 
  original 
  samples, 
  

   give 
  hereditary 
  percentages 
  of 
  a 
  much 
  higher 
  

   type 
  after 
  isolation 
  than 
  those 
  quoted 
  above. 
  

   They 
  come 
  up 
  to 
  10 
  - 
  20$ 
  and 
  in 
  some 
  cases 
  even 
  

   to 
  40$. 
  As 
  may 
  be 
  expected, 
  individual 
  differ- 
  

   ences 
  occur, 
  and 
  it 
  must 
  even 
  be 
  supposed 
  that 
  

   some 
  of 
  the 
  original 
  tricotyls 
  may 
  not 
  be 
  pure, 
  

   but 
  hybrids 
  between 
  tricotylous 
  and 
  dicotyl- 
  

   ous 
  parents. 
  These 
  are 
  at 
  once 
  eliminated 
  

   by 
  selection, 
  and 
  if 
  only 
  the 
  tricotyls 
  which 
  

   have 
  the 
  highest 
  percentages 
  are 
  chosen 
  for 
  the 
  

   continuance 
  of 
  the 
  new 
  race, 
  the 
  second 
  genera- 
  

   tion 
  comes 
  up 
  with 
  equal 
  numbers 
  of 
  dicotyls 
  

   and 
  tricotyls 
  among 
  the 
  seedlings. 
  The 
  figures 
  

   have 
  been 
  observed 
  to 
  range 
  from 
  51 
  - 
  58$ 
  in 
  the 
  

   majority 
  of 
  the 
  cases, 
  and 
  average 
  55$, 
  rarely 
  

   diverging 
  somewhat 
  more 
  from 
  this 
  average. 
  

  

  Here 
  we 
  have 
  the 
  true 
  type 
  of 
  an 
  ever-sport- 
  

   ing 
  variety. 
  Every 
  year 
  it 
  produces 
  in 
  the 
  

  

  