﻿Experimental 
  Pedigree-Cultures 
  563 
  

  

  from 
  the 
  beginning, 
  nor 
  does 
  it 
  need 
  any 
  natural 
  

   or 
  artificial 
  aid 
  if 
  it 
  is 
  present. 
  Most 
  of 
  my 
  

   new 
  species 
  have 
  proved 
  constant 
  from 
  the 
  first. 
  

   Whenever 
  possible, 
  the 
  original 
  mutants 
  have 
  

   been 
  isolated 
  during 
  the 
  flowering 
  period 
  and 
  

   artificially 
  self-fertilized. 
  Such 
  plants 
  have 
  al- 
  

   ways 
  given 
  a 
  uniform 
  progeny, 
  all 
  children 
  ex- 
  

   hibiting 
  the 
  type 
  of 
  the 
  parent. 
  No 
  atavism 
  

   was 
  observed 
  and 
  therefore 
  no 
  selection 
  was 
  

   needed 
  or 
  even 
  practicable. 
  

  

  Briefly 
  considering 
  the 
  different 
  forms, 
  we 
  

   may 
  state 
  that 
  the 
  full 
  experimental 
  proof 
  has 
  

   been 
  given 
  for 
  the 
  origin 
  of 
  gig 
  as 
  and 
  rubriner- 
  

   vis, 
  for 
  albida 
  and 
  oblonga, 
  and 
  even 
  for 
  na- 
  

   nella, 
  which 
  is 
  to 
  be 
  considered 
  as 
  of 
  a 
  varietal 
  

   nature 
  ; 
  with 
  lata 
  the 
  decisive 
  experiment 
  is 
  ex- 
  

   cluded 
  by 
  its 
  unisexuality. 
  Laevifolia 
  and 
  

   brevistylis 
  were 
  found 
  originally 
  in 
  the 
  field, 
  

   and 
  never 
  appeared 
  in 
  my 
  cultures. 
  No 
  obser- 
  

   vations 
  were 
  made 
  as 
  to 
  their 
  origin, 
  and 
  seeds 
  

   have 
  only 
  been 
  sown 
  from 
  later 
  generations. 
  

   But 
  these 
  have 
  yielded 
  uniform 
  crops, 
  thereby 
  

   showing 
  that 
  there 
  is 
  no 
  ground 
  for 
  the 
  assump- 
  

   tion 
  that 
  these 
  two 
  older 
  varieties 
  might 
  behave 
  

   otherwise 
  than 
  the 
  more 
  recent 
  derivatives. 
  

  

  Scintillans 
  and 
  elliptica 
  constitute 
  exceptions 
  

   to 
  the 
  rule 
  given. 
  They 
  repeat 
  their 
  character, 
  

   from 
  pure 
  seed, 
  only 
  in 
  part 
  of 
  the 
  offspring. 
  I 
  

   have 
  tried 
  to 
  deliver 
  the 
  scintillans 
  from 
  this 
  

  

  