﻿612 
  Mutations 
  

  

  of 
  a 
  new 
  horticultural 
  variety 
  has 
  been 
  record- 
  

   ed, 
  and 
  I 
  must 
  apologize 
  for 
  the 
  necessity 
  of 
  

   again 
  quoting 
  many 
  variations, 
  which 
  have 
  pre- 
  

   viously 
  been 
  dealt 
  with 
  from 
  another 
  point 
  of 
  

   view. 
  In 
  such 
  cases 
  I 
  shall 
  limit 
  myself 
  as 
  

   closely 
  as 
  possible 
  to 
  historical 
  facts. 
  They 
  have 
  

   been 
  recorded 
  chiefly 
  by 
  Verlot 
  and 
  Carriere, 
  

   who 
  wrote 
  in 
  Paris 
  shortly 
  after 
  the 
  middle 
  of 
  

   the 
  past 
  century, 
  and 
  afterwards 
  by 
  Darwin, 
  

   Korshinsky, 
  and 
  others. 
  It 
  is 
  from 
  their 
  writ- 
  

   ings 
  and 
  from 
  horticultural 
  literature 
  at 
  large 
  

   that 
  the 
  following 
  evidence 
  is 
  brought 
  together. 
  

   A 
  very 
  well-known 
  instance 
  is 
  that 
  of 
  the 
  

   dwarf 
  variety 
  of 
  Tagetes 
  signata,w}iic\i 
  arose 
  in 
  

   the 
  nursery 
  of 
  Vilmorin 
  in 
  the 
  year 
  1860. 
  It 
  

   was 
  observed 
  for 
  the 
  first 
  time 
  in 
  a 
  single 
  indi- 
  

   vidual 
  among 
  a 
  lot 
  of 
  the 
  ordinary 
  Tagetes 
  sig- 
  

   nata. 
  It 
  was 
  found 
  impossible 
  to 
  isolate 
  it, 
  but 
  

   the 
  seeds 
  were 
  saved 
  separately. 
  The 
  majority 
  

   of 
  the 
  offspring 
  returned 
  to 
  the 
  parental 
  type, 
  

   but 
  two 
  plants 
  were 
  true 
  dwarfs. 
  From 
  these 
  

   the 
  requisite 
  degree 
  of 
  purity 
  for 
  commercial 
  

   purposes 
  was 
  reached, 
  the 
  vicinists 
  not 
  being 
  

   more 
  numerous 
  than 
  10$ 
  of 
  the 
  entire 
  number. 
  

   The 
  same 
  mutation 
  had 
  been 
  observed 
  a 
  year 
  

   earlier 
  in 
  the 
  same 
  nursery 
  in 
  a 
  lot 
  of 
  Saponaria 
  

   caldbrica. 
  The 
  seeds 
  of 
  this 
  dwarf 
  repeated 
  the 
  

   variety 
  in 
  the 
  next 
  generation, 
  but 
  in 
  the 
  third 
  

   none 
  were 
  observed. 
  Then 
  the 
  variety 
  was 
  

  

  