﻿666 
  Mutations 
  

  

  leaved 
  ' 
  strawberry 
  has 
  already 
  been 
  referred 
  

   to. 
  It 
  originated 
  from 
  the 
  ordinary 
  type 
  in 
  

   Norway 
  and 
  at 
  Paris. 
  The 
  walnut 
  likewise, 
  has 
  

   its 
  monophyllous 
  variety. 
  It 
  was 
  mentioned 
  

   for 
  the 
  first 
  time 
  as 
  a 
  cultivated 
  tree 
  about 
  1864, 
  

   but 
  its 
  origin 
  is 
  unknown. 
  A 
  similar 
  variety 
  of 
  

   the 
  walnut, 
  with 
  " 
  one-bladed 
  : 
  leaves 
  but 
  of 
  

   varying 
  shapes, 
  was 
  found 
  wild 
  in 
  a 
  forest 
  near 
  

   Dieppe 
  in 
  France 
  some 
  years 
  ago, 
  and 
  appeared 
  

   to 
  be 
  due 
  to 
  a 
  sudden 
  mutation. 
  

  

  Something 
  more 
  is 
  known 
  concerning 
  the 
  

   " 
  one-bladed 
  " 
  ashes, 
  varieties 
  of 
  which 
  are 
  

   often 
  seen 
  in 
  our 
  parks 
  and 
  gardens. 
  The 
  com- 
  

   mon 
  form 
  has 
  broad 
  and 
  deeply 
  serrate 
  leaves, 
  

   which 
  are 
  far 
  more 
  rounded 
  than 
  the 
  leaflets 
  of 
  

   the 
  ordinary 
  ash. 
  The 
  majority 
  of 
  the 
  leaves 
  

   are 
  simple, 
  but 
  some 
  produce 
  one 
  or 
  two 
  smaller 
  

   leaflets 
  at 
  their 
  base, 
  closely 
  corresponding 
  in 
  

   this 
  respect 
  to 
  the 
  variations 
  of 
  the 
  " 
  one- 
  

   bladed 
  5 
  bastard-acacia, 
  and 
  evidently 
  indicat- 
  

   ing 
  the 
  same 
  latent 
  and 
  atavistic 
  character. 
  In 
  

   some 
  instances 
  this 
  analogy 
  goes 
  still 
  further, 
  

   and 
  incompletely 
  pinnate 
  leaves 
  are 
  produced 
  

   with 
  two 
  or 
  more 
  pairs 
  of 
  leaflets. 
  Besides 
  

   this 
  variable 
  type 
  another 
  has 
  been 
  described 
  

   by 
  Willdenow. 
  It 
  has 
  single 
  leaves 
  exclusive- 
  

   ly, 
  never 
  producing 
  smaller 
  lateral 
  leaflets, 
  

   and 
  it 
  is 
  said 
  to 
  be 
  absolutely 
  constant 
  

   from 
  seed, 
  while 
  the 
  more 
  variable 
  types 
  

  

  