﻿444 
  Miscellaneous. 
  

  

  One 
  of 
  its 
  extremities 
  soon 
  becomes 
  elongated 
  and 
  touches 
  on 
  the 
  

   surface 
  of 
  the 
  protoplasm 
  : 
  the 
  nucleus 
  then 
  seems 
  to 
  be 
  provided 
  

   with 
  a 
  sort 
  of 
  beak, 
  which 
  is 
  really 
  the 
  anterior 
  extremity 
  of 
  the 
  

   body 
  of 
  the 
  antherozoids. 
  

  

  When 
  this 
  sketch 
  of 
  the 
  body 
  appears 
  the 
  two 
  cilia 
  with 
  which 
  it. 
  

   will 
  be 
  provided 
  are 
  differentiated 
  close 
  to 
  the 
  anterior 
  extremity 
  in 
  

   the 
  thin 
  layer 
  of 
  hyaline 
  protoplasm 
  which 
  covered 
  the 
  outer 
  surface 
  

   of 
  the 
  nucleus, 
  and 
  which, 
  to 
  form 
  them, 
  is 
  continued 
  all 
  round 
  the 
  

   granular 
  protoplasm 
  situated 
  at 
  the 
  inner 
  surface. 
  They 
  at 
  once 
  

   acquire 
  their 
  definitive 
  length, 
  which 
  is 
  equal 
  to 
  that 
  of 
  the 
  adult 
  

   body. 
  Soon 
  after 
  their 
  formation 
  they 
  become 
  detached 
  from 
  the 
  

   granular 
  protoplasm 
  and 
  separate 
  more 
  or 
  less 
  from 
  each 
  other 
  in 
  

   the 
  free 
  Bpaee 
  situated 
  between 
  the 
  wall 
  of 
  the 
  mother-cell 
  and 
  the 
  

   contents. 
  

  

  While 
  the 
  anterior 
  extremity 
  of 
  the 
  antherozoid 
  begins 
  to 
  turn 
  

   round 
  the 
  surface 
  of 
  the 
  granular 
  protoplasm 
  the 
  posterior 
  extre- 
  

   mity, 
  by 
  the 
  elongation 
  of 
  the 
  thickening-band, 
  grows 
  in 
  the 
  oppo- 
  

   site 
  direction 
  and 
  soon 
  becomes 
  juxtaposed 
  with 
  the 
  former, 
  giving 
  

   a 
  first 
  turn 
  of 
  the 
  spiral. 
  The 
  nucleus 
  then 
  shows 
  a 
  progressive 
  

   diminution 
  of 
  volume 
  and 
  becomes 
  more 
  and 
  more 
  homogeneous 
  ; 
  

   then, 
  the 
  growth 
  continuing, 
  it 
  becomes 
  gradually 
  stretched 
  between 
  

   the 
  two 
  extremities 
  of 
  the 
  body, 
  so 
  that 
  the 
  swelling 
  which 
  it 
  formed 
  

   in 
  the 
  course 
  of 
  the 
  elongating 
  spiral 
  disappears 
  when 
  the 
  latter 
  

   includes 
  about 
  two 
  turns. 
  

  

  During 
  this 
  time 
  the 
  protoplasm 
  is 
  insensibly 
  digested 
  and 
  

   employed 
  in 
  the 
  nutrition 
  of 
  the 
  antherozoid. 
  Much 
  reduced 
  

   towards 
  the 
  end 
  of 
  the 
  development 
  it 
  adheres 
  only 
  to 
  the 
  inner 
  

   surface 
  of 
  the 
  posterior 
  extremity 
  of 
  the 
  bod}' 
  ; 
  and 
  when 
  the 
  latter 
  

   has 
  reached 
  its 
  full 
  length 
  it 
  disappears 
  without 
  leaving 
  a 
  vesicle, 
  

   as 
  in 
  other 
  Cryptogamia. 
  Nevertheless, 
  even 
  in 
  the 
  adult 
  stage 
  the 
  

   antherozoid 
  still 
  presents 
  some 
  protoplasmic 
  granules 
  upon 
  this 
  inner 
  

   face 
  of 
  its 
  posterior 
  extremity. 
  It 
  then 
  forms 
  (e. 
  g. 
  in 
  Chara 
  

   fragilis) 
  rather 
  more 
  than 
  three 
  turns 
  of 
  the 
  spiral. 
  It 
  presents 
  all 
  

   the 
  reactions 
  of 
  nueleine, 
  and 
  on 
  its 
  surface 
  there 
  is 
  an 
  excessively 
  

   thin 
  hyaline 
  envelope. 
  

  

  Thus, 
  from 
  the 
  morphological 
  point 
  of 
  view, 
  it 
  is 
  the 
  nucleus, 
  

   and 
  the 
  nucleus 
  alone, 
  that 
  is 
  directly 
  transformed, 
  without 
  breaking 
  

   up 
  into 
  a 
  spiral, 
  to 
  form 
  the 
  body 
  of 
  the 
  antherozoid, 
  the 
  formation 
  

   of 
  which 
  therefore 
  does 
  not 
  commence 
  in 
  the 
  protoplasm. 
  The 
  cilia 
  

   are 
  indeed 
  of 
  protoplasmic 
  origin 
  ; 
  carried 
  on 
  by 
  the 
  anterior 
  extre- 
  

   mity 
  upon 
  which 
  they 
  are 
  inserted, 
  they 
  must 
  necessarily 
  acquire 
  

   their 
  definitive 
  length 
  from 
  the 
  first 
  phase 
  of 
  development. 
  — 
  Cojnptes 
  

   llendus, 
  January 
  7, 
  1889, 
  p. 
  71. 
  

  

  