﻿496 
  Mutations 
  

  

  order 
  to 
  isolate 
  the 
  reputed 
  pure 
  grandiflorum 
  

   type. 
  During 
  the 
  beginning 
  of 
  the 
  flowering 
  

   period 
  I 
  ruthlessly 
  threw 
  away 
  all 
  plants 
  dis- 
  

   playing 
  less 
  than 
  21 
  rays 
  in 
  the 
  first 
  or 
  terminal 
  

   head. 
  But 
  this 
  selection 
  was 
  not 
  to 
  be 
  consid- 
  

   ered 
  as 
  complete, 
  because 
  the 
  13-rayed 
  race 
  may 
  

   eventually 
  transgress 
  its 
  boundary 
  and 
  come 
  

   over 
  to 
  the 
  21 
  and 
  more. 
  This 
  made 
  a 
  second 
  

   selection 
  necessary. 
  On 
  the 
  selected 
  plants 
  

   all 
  the 
  secondary 
  heads 
  were 
  inspected 
  and 
  

   their 
  ray-florets 
  counted. 
  Some 
  individuals 
  

   showed 
  an 
  average 
  of 
  about 
  13 
  and 
  were 
  de- 
  

   stroyed. 
  Others 
  gave 
  doubtful 
  figures 
  and 
  

   were 
  likewise 
  eliminated, 
  and 
  only 
  6 
  out 
  of 
  a 
  

   lot 
  of 
  nearly 
  300 
  flowering 
  plants 
  reached 
  an 
  

   average 
  of 
  21 
  for 
  all 
  of 
  the 
  flowers. 
  

  

  Our 
  summer 
  is 
  a 
  short 
  one, 
  compared 
  with 
  the 
  

   long 
  and 
  beautiful 
  summer 
  of 
  California, 
  and 
  it 
  

   was 
  too 
  late 
  to 
  cut 
  off 
  the 
  faded 
  and 
  the 
  open 
  

   flowers, 
  and 
  await 
  new 
  ones, 
  which 
  might 
  be 
  

   purely 
  fertilized 
  after 
  the 
  destruction 
  of 
  

   all 
  minor 
  plants. 
  So 
  I 
  had 
  to 
  gather 
  the 
  seed 
  

   from 
  flowers, 
  which 
  might 
  have 
  been 
  partially 
  

   fertilized 
  by 
  the 
  wrong 
  pollen. 
  This 
  however, 
  

   is 
  not 
  so 
  great 
  a 
  drawback 
  in 
  selection 
  experi- 
  

   ments 
  as 
  might 
  be 
  supposed 
  at 
  first 
  sight. 
  The 
  

   selection 
  of 
  the 
  following 
  year 
  is 
  sure 
  to 
  elim- 
  

   inate 
  the 
  offspring 
  of 
  such 
  impure 
  parentage. 
  

  

  