﻿Mutations 
  in 
  Horticulture 
  617 
  

  

  ascribed 
  by 
  some 
  authors 
  to 
  the 
  fact 
  that 
  often 
  

   on 
  the 
  same 
  tree 
  the 
  male 
  catkins 
  flower 
  and 
  fall 
  

   off 
  several 
  weeks 
  before 
  the 
  ripening 
  of 
  the 
  

   pistils 
  of 
  the 
  other 
  form 
  of 
  flowers. 
  

  

  Weeping 
  varieties 
  afford 
  similar 
  instances. 
  

   Soplwra 
  japonica 
  pendula 
  originated 
  about 
  

   1850, 
  and 
  Gleditschia 
  triacanthos 
  pendula 
  some 
  

   time 
  later 
  in 
  a 
  nursery 
  at 
  Chateau-Thierry 
  

   (Aisne, 
  France). 
  In 
  the 
  year 
  1821 
  the 
  bird's 
  

   cherry, 
  or 
  Prunus 
  Padus, 
  produced 
  a 
  weeping 
  

   variety, 
  and 
  in 
  1847 
  the 
  same 
  mutation 
  was 
  ob- 
  

   served 
  for 
  the 
  allied 
  Prunus 
  Malialeb. 
  Numer- 
  

   ous 
  other 
  instances 
  of 
  the 
  sudden 
  origin 
  of 
  

   weeping 
  trees, 
  both 
  of 
  conifers 
  and 
  of 
  others, 
  

   have 
  been 
  brought 
  together 
  in 
  Korshinsky's 
  

   paper. 
  This 
  striking 
  type 
  of 
  variation 
  includes 
  

   perhaps 
  the 
  best 
  examples 
  of 
  the 
  whole 
  his- 
  

   torical 
  evidence. 
  As 
  a 
  rule 
  they 
  appear 
  in 
  large 
  

   sowings, 
  only 
  one, 
  or 
  only 
  a 
  few 
  at 
  a 
  time. 
  Many 
  

   of 
  them 
  have 
  not 
  been 
  observed 
  during 
  their 
  

   youth, 
  but 
  only 
  after 
  having 
  been 
  planted 
  out 
  

   in 
  parks 
  and 
  forests, 
  since 
  the 
  weeping 
  charac- 
  

   ters 
  show 
  only 
  after 
  several 
  years. 
  

  

  The 
  monophyllous 
  bastard-acacia 
  originated 
  

   in 
  the 
  same 
  way. 
  Its 
  peculiarities 
  will 
  be 
  dealt 
  

   with 
  on 
  another 
  occasion, 
  but 
  the 
  circumstances 
  

   of 
  its 
  birth 
  may 
  as 
  well 
  be 
  given 
  here. 
  In 
  1855 
  

   in 
  the 
  nursery 
  of 
  Deniau, 
  at 
  Brain-sur-1'Au- 
  

   thion 
  (Maine 
  et 
  Loire), 
  it 
  appeared 
  in 
  a 
  lot 
  of 
  

  

  