﻿" 
  Rogues" 
  among 
  Culinary 
  Peas 
  (Pisum 
  sativum). 
  195 
  

  

  ;and 
  that 
  when 
  united 
  in 
  fertilization 
  with 
  a 
  type 
  gamete, 
  the 
  resulting 
  zygote 
  

   is 
  nearer 
  the 
  type 
  than 
  any 
  combination 
  of 
  intermediate 
  gametes 
  would 
  be. 
  

  

  Class 
  2 
  plants 
  throw 
  perceptibly 
  more 
  pointed 
  plants 
  than 
  do 
  the 
  real 
  types 
  

   4see 
  p. 
  192) 
  but 
  they 
  do 
  not 
  show 
  the 
  gradational 
  phenomenon 
  as 
  Class 
  3 
  

   plants 
  do. 
  Evidently 
  the 
  gradual 
  extrusion 
  of 
  the 
  type 
  at 
  the 
  successive 
  

   nodes 
  must 
  be 
  a 
  process 
  similar 
  to 
  that 
  by 
  which 
  the 
  type 
  is 
  extruded 
  in 
  the 
  

   base 
  of 
  Fi, 
  differing 
  only 
  in 
  that 
  it 
  is 
  prolonged 
  over 
  a 
  longer 
  series 
  of 
  nodes. 
  

   -The 
  actual 
  data 
  suggest 
  that 
  the 
  gradational 
  phenomenon 
  occurs 
  with 
  greatest 
  

   intensity 
  in 
  the 
  more 
  rogue-like 
  of 
  the 
  intermediate 
  plants 
  and 
  is 
  less 
  well 
  

   marked 
  in 
  those 
  which, 
  judged 
  by 
  their 
  offspring, 
  are 
  higher 
  (more 
  type-like) 
  

   in 
  genetic 
  composition, 
  being 
  absent 
  altogether 
  in 
  Class 
  2. 
  Discussion 
  of 
  

   these 
  points 
  cannot 
  be 
  given 
  in 
  brief. 
  

  

  As 
  it 
  seemed 
  possible 
  that 
  the 
  types 
  might 
  be 
  tetraploid, 
  counts 
  of 
  

   ■chromosomes 
  were 
  made 
  by 
  Miss 
  Nesta 
  Thomas, 
  but 
  the 
  number 
  found 
  in 
  

   both 
  rogue 
  and 
  type 
  was 
  the 
  same 
  (seven 
  for 
  the 
  haploid 
  number).* 
  

  

  The 
  persistent 
  recurrence 
  of 
  rogues 
  among 
  the 
  offspring 
  of 
  types 
  must 
  

   indicate 
  some 
  liability 
  to 
  an 
  error 
  in 
  cell-division. 
  Once 
  the 
  abnormality 
  has 
  

   occurred, 
  of 
  which 
  pointed 
  leaflets 
  are 
  the 
  ostensible 
  indication, 
  there 
  is 
  a 
  

   progressive 
  change 
  in 
  successive 
  generations 
  such 
  that, 
  assuming 
  equal 
  

   fecundity 
  in 
  all 
  classes, 
  the 
  progeny 
  would 
  in 
  a 
  few 
  generations 
  consist 
  of 
  

   rrogues 
  in 
  overwhelming 
  proportions. 
  It 
  was 
  a 
  commonplace 
  of 
  practical 
  

   •breeders 
  and 
  of 
  conventional 
  evolutionists 
  that 
  when 
  selection 
  is 
  suspended, 
  a 
  

   breed 
  " 
  degenerates." 
  This 
  doctrine, 
  promulgated, 
  as 
  it 
  commonly 
  was, 
  

   without 
  any 
  reservation 
  as 
  to 
  crossing 
  or 
  reference 
  to 
  critical 
  purity 
  of 
  line 
  is 
  

   fallacious 
  as 
  an 
  expression 
  of 
  physiological 
  truths 
  however 
  much 
  the 
  objective 
  

   consequences 
  may 
  seem 
  to 
  fulfil 
  the 
  prophecy. 
  In 
  the 
  present 
  example 
  the 
  

   popular 
  conception 
  of 
  degeneration 
  is 
  precisely 
  realised. 
  So 
  far 
  as 
  we 
  know 
  it 
  

   •unique. 
  

  

  Since 
  confirmed 
  by 
  Prof. 
  K. 
  Matsui. 
  

  

  