﻿Experimental 
  Pedigree-Cultures 
  559 
  

  

  no 
  struggle 
  for 
  existence 
  are 
  needed 
  to 
  reach 
  

   this 
  end. 
  In 
  previous 
  lectures 
  I 
  have 
  mentioned 
  

   that 
  I 
  have 
  saved 
  the 
  seeds 
  of 
  the 
  mutants 
  

   whenever 
  possible, 
  and 
  have 
  always 
  obtained 
  

   repetitions 
  of 
  the 
  prototype 
  only. 
  Eeversions 
  

   are 
  as 
  absolutely 
  lacking 
  as 
  is 
  also 
  a 
  further 
  de- 
  

   velopment 
  of 
  the 
  new 
  type. 
  Even 
  in 
  the 
  case 
  of 
  

   the 
  inconstant 
  forms, 
  where 
  part 
  of 
  the 
  progeny 
  

   yearly 
  return 
  to 
  the 
  stature 
  of 
  lamarcMana, 
  in- 
  

   termediates 
  are 
  not 
  found. 
  So 
  it 
  is 
  also 
  with 
  

   lata, 
  which 
  is 
  pistillate 
  and 
  can 
  only 
  be 
  prop- 
  

   agated 
  by 
  cross-fertilization. 
  But 
  though 
  the 
  

   current 
  belief 
  would 
  expect 
  intermediates 
  at 
  

   least 
  in 
  this 
  case, 
  they 
  do 
  not 
  occur. 
  I 
  made 
  a 
  

   pedigree-culture 
  of 
  lata 
  during 
  eight 
  successive 
  

   generations, 
  pollinating 
  them 
  in 
  different 
  ways, 
  

   and 
  always 
  obtained 
  cultures 
  which 
  were 
  partly 
  

   constituted 
  of 
  lata 
  and 
  partly 
  of 
  lamarckiana 
  

   specimens. 
  But 
  the 
  latas 
  remained 
  lata 
  in 
  all 
  

   the 
  various 
  and 
  most 
  noticeable 
  characters, 
  

   never 
  showing 
  any 
  tendency 
  to 
  gradually 
  revert 
  

   into 
  the 
  original 
  form. 
  

  

  Intermediate 
  forms, 
  if 
  not 
  occurring 
  in 
  the 
  

   direct 
  line 
  from 
  one 
  species 
  to 
  another, 
  might 
  be 
  

   expected 
  to 
  appear 
  perhaps 
  on 
  lateral 
  branches. 
  

   In 
  this 
  case 
  the 
  mutants 
  of 
  one 
  type, 
  appearing 
  

   in 
  the 
  same 
  year, 
  would 
  not 
  be 
  a 
  pure 
  type, 
  but 
  

   would 
  exhibit 
  different 
  degrees 
  of 
  deviation 
  

   from 
  the 
  parent. 
  The 
  best 
  would 
  then 
  have 
  to 
  

  

  