﻿100 
  

  

  Dr. 
  A. 
  Arber. 
  

  

  The 
  bud 
  permanently 
  occupies 
  a 
  position 
  at 
  the 
  side 
  of 
  the 
  limb, 
  and 
  lies 
  

   between 
  the 
  sheath 
  of 
  the 
  leaf 
  to 
  which 
  it 
  belongs 
  and 
  the 
  axis. 
  It 
  is 
  not 
  

   necessary 
  to 
  follow 
  the 
  history 
  of 
  the 
  succeeding 
  leaves, 
  l 
  s 
  , 
  l 
  i; 
  etc., 
  which 
  

   form 
  bud-pockets 
  in 
  a 
  precisely 
  similar 
  way. 
  The 
  peculiar 
  lateral 
  position 
  

  

  2. 
  4 
  

  

  Figs. 
  3-7. 
  — 
  Pistia 
  Stratiotes, 
  L. 
  Series 
  of 
  

   transverse 
  sections 
  through 
  lateral 
  bud, 
  from 
  

   base 
  upwards 
  ( 
  x 
  14) 
  ; 
  r., 
  root 
  ; 
  ax., 
  axis 
  ; 
  

   ly, 
  first 
  scale 
  leaf 
  ; 
  l^-l^, 
  limbs 
  of 
  successive 
  

   foliage 
  leaves 
  ; 
  S]-s 
  5 
  , 
  sheaths 
  of 
  these 
  leaves 
  ; 
  

   hPn 
  HP-i 
  hP-i 
  s 
  iP-i 
  an< 
  ^ 
  S 
  &P"> 
  bud-containing 
  

   pockets 
  associated 
  with 
  these 
  leaves, 
  enclos- 
  

   ing 
  the 
  buds 
  marked 
  b 
  v 
  etc. 
  In 
  fig. 
  7 
  all 
  

   structures 
  above 
  leaf 
  4 
  are 
  omitted. 
  

  

  of 
  the 
  buds 
  may 
  perhaps 
  be 
  interpreted 
  as 
  due 
  to 
  the 
  congenital 
  fusion 
  of 
  the 
  

   base 
  of 
  the 
  limb 
  with 
  the 
  axis 
  ; 
  this 
  fusion 
  obliterates 
  the 
  space 
  which 
  would 
  

   normally 
  be 
  occupied 
  by 
  the 
  bud. 
  

  

  It 
  will 
  be 
  recognised, 
  from 
  the 
  description 
  just 
  given 
  and 
  from 
  the 
  accom- 
  

  

  