﻿544 
  Mutations 
  

  

  Fertilizing 
  the 
  flowers 
  artificially 
  with 
  their 
  

   own 
  pollen, 
  excluding 
  the 
  visiting 
  insects 
  by 
  

   means 
  of 
  paper 
  bags, 
  and 
  saving 
  and 
  sowing 
  

   the 
  seed 
  of 
  each 
  individual 
  separately, 
  fur- 
  

   nishes 
  all 
  the 
  requisites 
  for 
  the 
  estimation 
  of 
  the 
  

   degree 
  of 
  stability 
  of 
  this 
  species. 
  In 
  the 
  first 
  

   few 
  weeks 
  the 
  seed-pans 
  do 
  not 
  show 
  any 
  un- 
  

   equality, 
  and 
  often 
  the 
  young 
  plants 
  must 
  be 
  re- 
  

   planted 
  at 
  wider 
  intervals, 
  before 
  anything 
  

   can 
  be 
  made 
  out 
  with 
  certainty. 
  But 
  as 
  soon 
  

   as 
  the 
  rosettes 
  begin 
  to 
  fill 
  it 
  becomes 
  mani- 
  

   fest 
  that 
  some 
  of 
  them 
  are 
  more 
  backward 
  than 
  

   others 
  in 
  size. 
  Soon 
  the 
  smaller 
  ones 
  show 
  

   their 
  deeper 
  green 
  and 
  broader 
  leaves, 
  and 
  

   thereby 
  display 
  the 
  attributes 
  of 
  the 
  scintillans. 
  

   The 
  other 
  grow 
  faster 
  and 
  stronger 
  and 
  exhibit 
  

   all 
  the 
  characteristics 
  of 
  ordinary 
  lamarcki- 
  

   anas. 
  

  

  The 
  numerical 
  proportion 
  of 
  these 
  two 
  groups 
  

   has 
  been 
  found 
  different 
  on 
  different 
  occasions. 
  

   Some 
  plants 
  give 
  about 
  one-third 
  scintillans 
  

   and 
  two-thirds 
  lamarckiana, 
  while 
  the 
  progeny 
  

   of 
  individuals 
  of 
  another 
  strain 
  show 
  exactly 
  

   the 
  reverse 
  proportion. 
  

  

  Two 
  points 
  deserve 
  to 
  be 
  noticed. 
  First 
  the 
  

   progeny 
  of 
  the 
  scintillans 
  appears 
  to 
  be 
  mutable 
  

   in 
  a 
  large 
  degree, 
  exceeding 
  even 
  the 
  lamarcki- 
  

   ana. 
  The 
  same 
  forms 
  that 
  are 
  produced 
  most 
  

   often 
  by 
  the 
  parent-family 
  are 
  also 
  most 
  ordi- 
  

  

  