﻿506 
  Mutations 
  

  

  tice. 
  In 
  the 
  greater 
  number 
  of 
  cases 
  recorded 
  

   it 
  remains 
  doubtful 
  whether 
  the 
  work 
  said 
  to 
  be 
  

   done 
  to 
  obtain 
  a 
  new 
  double 
  variety 
  was 
  done 
  

   before 
  the 
  appearance 
  of 
  these 
  preliminary 
  indi- 
  

   cations 
  or 
  afterward. 
  

  

  In 
  the 
  first 
  case, 
  it 
  would 
  correspond 
  with 
  

   our 
  selection 
  of 
  large 
  numbers 
  of 
  florets 
  in 
  the 
  

   outer 
  rays, 
  in 
  the 
  second 
  however, 
  with 
  the 
  or- 
  

   dinary 
  purification 
  of 
  new 
  races 
  from 
  hybrid 
  

   mixtures. 
  

  

  In 
  scientific 
  selection-experiments 
  such 
  cross- 
  

   es 
  are 
  of 
  course 
  avoided, 
  and 
  the 
  process 
  of 
  

   purification 
  is 
  unnecessary, 
  even 
  as 
  in 
  the 
  

   Chrysanthemum 
  culture. 
  The 
  first 
  generation 
  

   succeeding 
  the 
  original 
  plant 
  with 
  disk-rays 
  was 
  

   in 
  this 
  respect 
  wholly 
  uniform 
  and 
  true 
  to 
  the 
  

   new 
  type. 
  

  

  In 
  practice 
  the 
  work 
  does 
  not 
  start 
  from 
  such 
  

   slight 
  indications, 
  and 
  is 
  done 
  with 
  no 
  other 
  

   purpose 
  in 
  view 
  than 
  to 
  produce 
  double 
  flowers 
  

   in 
  species 
  in 
  which 
  they 
  did 
  not 
  already 
  exist. 
  

   Therefore 
  it 
  is 
  of 
  the 
  highest 
  importance 
  to 
  

   know 
  the 
  methods 
  used 
  and 
  the 
  chances 
  of 
  suc- 
  

   cess. 
  Unfortunately 
  the 
  evidence 
  is 
  very 
  scanty 
  

   on 
  both 
  points. 
  

  

  Lindley 
  and 
  other 
  writers 
  on 
  horticultural 
  

   theory 
  and 
  practice 
  assert 
  that 
  a 
  large 
  amount 
  

   of 
  nourishment 
  tends 
  to 
  produce 
  double 
  flow- 
  

   ers, 
  while 
  a 
  culture 
  under 
  normal 
  conditions, 
  

  

  