﻿192 
  Prof. 
  W. 
  Bateson 
  and 
  Miss 
  C. 
  Pellew. 
  The 
  Genetics 
  of 
  

  

  grouped 
  into 
  three 
  or 
  four 
  successive 
  lots. 
  This 
  was 
  done 
  before 
  we 
  set- 
  

   about 
  determining 
  the 
  actual 
  ratios 
  for 
  each 
  flower, 
  and 
  though 
  the 
  numbers 
  

   are 
  not 
  available 
  for 
  that 
  purpose, 
  they 
  provide 
  a 
  larger 
  total 
  of 
  observations 
  

   than 
  could 
  have 
  been 
  reached 
  had 
  the 
  material 
  been 
  more 
  subdivided. 
  It 
  

   will 
  be 
  noticed 
  that 
  a 
  progressive 
  decline 
  (towards 
  the 
  rogues) 
  can 
  be 
  often 
  

   seen 
  in 
  the 
  offspring 
  of 
  branches 
  as 
  well 
  as 
  on 
  the 
  main 
  stems. 
  

  

  In 
  Table 
  II 
  the 
  plants 
  are 
  classified 
  in 
  the 
  five 
  classes 
  which 
  we 
  have 
  

   arbitrarily 
  used. 
  Class 
  1 
  is 
  the 
  true 
  type 
  ; 
  Class 
  2 
  differs 
  from 
  it 
  slightly 
  

   and 
  evasively 
  in 
  foliage, 
  but 
  chiefly 
  in 
  having 
  some 
  curvature 
  in 
  the 
  pods 
  ; 
  

   Class 
  3 
  are 
  the 
  pointed 
  intermediates 
  of 
  the 
  kind 
  which 
  show 
  the 
  grada- 
  

   tional 
  changes 
  ; 
  Class 
  4 
  contains 
  plants 
  below 
  Class 
  3 
  and 
  approaching 
  

   Class 
  5, 
  which 
  last 
  are 
  the 
  genuine 
  rogues. 
  Of 
  these 
  classes, 
  1 
  and 
  2 
  are 
  

   non-pointed 
  ; 
  3, 
  4, 
  and 
  5 
  are 
  pointed. 
  There 
  is 
  a 
  complete 
  series 
  of 
  inter- 
  

   grades, 
  both 
  in 
  somatic 
  appearance, 
  and 
  in 
  genetic 
  constitution 
  as 
  indicated 
  

   by 
  the 
  families 
  produced. 
  

  

  For 
  Table 
  II 
  we 
  have 
  chosen 
  those 
  families 
  which 
  contained 
  at 
  least 
  one 
  

   non-pointed 
  plant. 
  The 
  progressive 
  decline 
  towards 
  rogues 
  affects 
  the 
  lower 
  

   classes, 
  and 
  not 
  merely 
  the 
  frequency 
  of 
  the 
  non-pointed 
  plants. 
  The 
  same 
  

   feature 
  is 
  also 
  shown 
  by 
  the 
  families 
  containing 
  only 
  pointed 
  plants, 
  which 
  

   we 
  have 
  not 
  included 
  in 
  this 
  epitome. 
  It 
  appears 
  also 
  in 
  the 
  distribution 
  of 
  

   the 
  several 
  pointed 
  classes 
  resulting 
  from 
  crossing 
  the 
  intermediates 
  as 
  

   female 
  with 
  type, 
  the 
  pointed 
  plants 
  thus 
  produced 
  by 
  the 
  lower 
  pods 
  being 
  

   chiefly 
  Classes 
  3 
  and 
  4, 
  the 
  corresponding 
  plants 
  from 
  the 
  upper 
  pods 
  being: 
  

   chiefly 
  rogues 
  of 
  Class 
  5. 
  This 
  feature, 
  which 
  is 
  not 
  shown 
  in 
  Table 
  I, 
  was 
  1 
  

   most 
  conspicuous 
  when 
  the 
  tall 
  intermediates 
  were 
  used. 
  

  

  Inasmuch 
  as 
  the 
  relative 
  proportions 
  of 
  the 
  several 
  kinds 
  of 
  offspring 
  

   produced 
  by 
  Class 
  3 
  plants 
  (and 
  doubtless 
  by 
  Class 
  4 
  also) 
  depend 
  on 
  the' 
  

   absolute 
  height 
  of 
  the 
  parents, 
  it 
  is 
  impossible 
  to 
  give 
  any 
  significant 
  figure* 
  

   for 
  these 
  proportions, 
  but 
  the 
  averages 
  produced 
  by 
  the 
  self-fertilisation 
  of; 
  

   the 
  several 
  classes 
  are 
  roughly 
  as 
  follows 
  : 
  — 
  

  

  Non-pointed 
  to 
  Pointed. 
  

  

  Class 
  1 
  47 
  1 
  

  

  „ 
  2* 
  12 
  1 
  

  

  „ 
  3 
  ...... 
  1 
  ...... 
  10-20 
  

  

  „ 
  4 
  1 
  160 
  

  

  „ 
  5 
  All 
  rogues. 
  

  

  * 
  Class 
  2 
  in 
  our 
  first 
  paper 
  (' 
  Jour. 
  Genetics, 
  1 
  vol. 
  5) 
  was 
  not 
  the 
  exact 
  equivalent 
  of 
  

   that 
  subsequently 
  adopted. 
  We 
  had 
  not 
  then 
  appreciated 
  that 
  the 
  points 
  are 
  the 
  best 
  

   criterion, 
  and 
  we 
  previously 
  included 
  in 
  Class 
  3 
  plants 
  which 
  we 
  now 
  know 
  to 
  belong 
  

   genetically 
  rather 
  with 
  Class 
  2. 
  The 
  inclusion 
  of 
  such 
  plants 
  in 
  Class 
  2, 
  of 
  course,, 
  

   lowers 
  the 
  average 
  offspring 
  of 
  that 
  class. 
  

  

  