﻿510 
  Mutations 
  

  

  This 
  conception 
  of 
  the 
  inner 
  nature 
  of 
  double 
  

   flowers 
  explains 
  the 
  fact 
  that 
  the 
  varietal 
  mark 
  

   is 
  seldom 
  seen 
  to 
  be 
  complete 
  throughout 
  larger 
  

   groups 
  of 
  individuals, 
  providing 
  these 
  have 
  not 
  

   been 
  already 
  selected 
  by 
  this 
  character. 
  

   Tagetes 
  africana 
  is 
  liable 
  to 
  produce 
  some 
  

   poorly 
  filled 
  specimens, 
  and 
  some 
  double 
  va- 
  

   rieties 
  of 
  carnations 
  are 
  offered 
  for 
  sale 
  with 
  the 
  

   note 
  that 
  the 
  seed 
  yields 
  only 
  80% 
  of 
  doubles. 
  

   With 
  Chrysanthemum 
  coronarium 
  and 
  blue-bot- 
  

   tles 
  this 
  figure 
  is 
  often 
  announced 
  to 
  be 
  only 
  

   about 
  50^. 
  No 
  doubt 
  it 
  is 
  partly 
  due 
  to 
  im- 
  

   purities, 
  caused 
  by 
  vicinism, 
  but 
  it 
  is 
  obviously 
  

   improbable 
  that 
  the 
  effect 
  of 
  these 
  impurities 
  

   should 
  be 
  so 
  large. 
  

  

  Some 
  cases 
  of 
  partial 
  reversion 
  may 
  be 
  inter- 
  

   preted 
  in 
  the 
  same 
  way. 
  Among 
  the 
  garden 
  

   anemones, 
  Anemone 
  coronaria, 
  there 
  is 
  a 
  va- 
  

   riety 
  called 
  the 
  i 
  i 
  Bride, 
  ' 
  ' 
  on 
  account 
  of 
  its 
  pure 
  

   white 
  flowers. 
  It 
  is 
  for 
  sale 
  with 
  single 
  and 
  

   with 
  double 
  flowers, 
  and 
  these 
  two 
  forms 
  are 
  

   known 
  to 
  sport 
  into 
  one 
  another, 
  although 
  they 
  

   are 
  multiplied 
  in 
  the 
  vegetative 
  way. 
  Such 
  cases 
  

   are 
  known 
  to 
  be 
  of 
  quite 
  ordinary 
  occurrence. 
  

   Of 
  course 
  such 
  sports 
  must 
  be 
  considered 
  as 
  

   partial, 
  and 
  the 
  same 
  stem 
  may 
  bear 
  both 
  types 
  

   of 
  flowers. 
  It 
  even 
  happens 
  that 
  some 
  partic- 
  

   ular 
  flower 
  is 
  partly 
  double 
  and 
  partly 
  single. 
  

   Mr. 
  Krelage, 
  of 
  Haarlem, 
  had 
  the 
  kindness 
  to 
  

  

  