﻿670 
  Mutations 
  

  

  distinct 
  indications 
  of 
  complying 
  with 
  the 
  gen- 
  

   eral 
  law 
  of 
  periodicity. 
  The 
  first 
  leaves 
  are 
  

   smaller, 
  with 
  more 
  rounded 
  lobes, 
  the 
  subse- 
  

   quent 
  leaves 
  attain 
  a 
  larger 
  size, 
  and 
  their 
  lobes 
  

   slightly 
  change 
  their 
  forms. 
  In 
  the 
  first 
  leaves 
  

   the 
  lobes 
  are 
  so 
  broad 
  as 
  to 
  touch 
  one 
  another 
  

   along 
  a 
  large 
  part 
  of 
  their 
  margins, 
  but 
  in 
  or- 
  

   gans 
  formed 
  later 
  this 
  contact 
  gradually 
  dimin- 
  

   ishes 
  and 
  the 
  typical 
  leaves 
  have 
  the 
  lobes 
  wide- 
  

   ly 
  separated. 
  Now 
  it 
  is 
  easily 
  understood 
  that 
  

   the 
  contact 
  or 
  the 
  separation 
  of 
  the 
  lobes 
  must 
  

   play 
  a 
  part 
  in 
  the 
  construction 
  of 
  the 
  ascidia, 
  

   as 
  soon 
  as 
  the 
  margins 
  grow 
  together. 
  Leaves 
  

   which 
  touch 
  one 
  another, 
  may 
  be 
  affected 
  by 
  

   the 
  connation 
  without 
  any 
  further 
  malforma- 
  

   tion. 
  They 
  remain 
  flat, 
  become 
  peltate 
  and 
  ex- 
  

   hibit 
  a 
  shape 
  which 
  in 
  some 
  way 
  holds 
  a 
  mid- 
  

   dle 
  position 
  between 
  the 
  pennyworts 
  and 
  the 
  

   lemon-scented 
  eucalyptus. 
  Here 
  we 
  have 
  

   the 
  repetition 
  of 
  the 
  specific 
  characters 
  of 
  these 
  

   plants 
  by 
  the 
  anomaly 
  of 
  another. 
  Whenever 
  

   the 
  margins 
  are 
  not 
  in 
  contact, 
  and 
  become 
  con- 
  

   nate, 
  notwithstanding 
  their 
  separation, 
  the 
  blade 
  

   must 
  be 
  folded 
  together 
  in 
  some 
  slight 
  degree, 
  

   in 
  order 
  to 
  produce 
  the 
  required 
  contact. 
  This 
  

   is 
  the 
  origin 
  of 
  the 
  ascidium. 
  It 
  is 
  quite 
  super- 
  

   fluous 
  to 
  insist 
  upon 
  the 
  fact 
  that 
  their 
  width 
  

   or 
  narrowness 
  must 
  depend 
  upon 
  the 
  corre- 
  

   sponding 
  normal 
  form. 
  The 
  more 
  distant 
  the 
  

  

  