﻿Monstrosities 
  423 
  

  

  reached 
  ; 
  so 
  for 
  instance 
  with 
  the 
  mercury, 
  I 
  had 
  

   three 
  succeeding 
  generations 
  of 
  selection 
  after 
  

   reaching 
  the 
  average 
  of 
  55$, 
  but 
  their 
  extremes 
  

   gave 
  no 
  increasing 
  advance, 
  remaining 
  at 
  86, 
  92 
  

   and 
  91$. 
  

  

  If 
  we 
  compare 
  these 
  results 
  with 
  the 
  effects 
  

   of 
  selection 
  in 
  twisted 
  and 
  fasciated 
  races, 
  we 
  

   observe 
  a 
  marked 
  contrast. 
  Here 
  they 
  reached 
  

   their 
  height 
  at 
  30 
  - 
  40%, 
  and 
  no 
  number 
  of 
  gen- 
  

   erations 
  had 
  the 
  power 
  of 
  making 
  any 
  further 
  

   improvement. 
  The 
  tricotyls 
  come 
  up 
  in 
  two 
  

   generations 
  to 
  a 
  proportion 
  of 
  about 
  54$, 
  which 
  

   shows 
  itself 
  to 
  correspond 
  to 
  the 
  average 
  

   type. 
  And 
  as 
  soon 
  as 
  this 
  is 
  reached, 
  only 
  one 
  

   generation 
  is 
  required 
  to 
  obtain 
  a 
  very 
  consid- 
  

   erable 
  improvement, 
  going 
  up 
  to 
  80 
  or 
  even 
  90$. 
  

  

  It 
  is 
  evident 
  that 
  the 
  cause 
  of 
  this 
  difference 
  

   does 
  not 
  lie 
  in 
  the 
  nature 
  of 
  the 
  monstrosity, 
  but 
  

   is 
  due 
  to 
  the 
  criterion 
  upon 
  which 
  the 
  selection 
  

   is 
  made. 
  Selection 
  of 
  the 
  apparently 
  best 
  in- 
  

   dividuals 
  is 
  one 
  method, 
  and 
  it 
  gives 
  admirable 
  

   results. 
  Selection 
  on 
  the 
  ground 
  of 
  the 
  hered- 
  

   itary 
  percentages 
  is 
  another 
  method 
  and 
  gives 
  

   results 
  which 
  are 
  far 
  more 
  advantageous 
  than 
  

   the 
  former. 
  

  

  In 
  the 
  lecture 
  on 
  the 
  pistillody 
  of 
  the 
  poppies 
  

   we 
  limited 
  ourselves 
  to 
  the 
  selection 
  of 
  the 
  finest 
  

   individuals 
  and 
  showed 
  that 
  there 
  is 
  always 
  a 
  

   manifest 
  correlation 
  between 
  the 
  individual 
  

  

  