﻿Dr. 
  L. 
  Plate 
  on 
  Noctiluca 
  miliaria, 
  Sur. 
  25 
  

  

  viscous 
  structureless 
  jelly, 
  which 
  is 
  secreted 
  in 
  a 
  thin 
  layer 
  

   from 
  the 
  part 
  of 
  the 
  body-wall 
  situated 
  above 
  the 
  central 
  

   plasma. 
  It 
  is 
  remarkable 
  that 
  the 
  nuclei 
  do 
  not 
  now 
  imme- 
  

   diately 
  become 
  fused 
  together 
  after 
  the 
  portions 
  of 
  membrane 
  

   lying 
  between 
  them 
  have 
  been 
  absorbed 
  ; 
  at 
  first 
  they 
  rather 
  

   depart 
  from 
  one 
  another, 
  so 
  that 
  in 
  one 
  of 
  the 
  first 
  stages 
  of 
  

   the 
  conjugation, 
  when 
  a 
  slender 
  canal 
  of 
  union 
  has 
  been 
  deve- 
  

   loped 
  between 
  the 
  pairers, 
  the 
  nuclei 
  lie 
  closer 
  together 
  than 
  

   somewhat 
  later. 
  Thus, 
  while 
  the 
  biscuit-like 
  emargination 
  

   between 
  the 
  individuals 
  gradually 
  becomes 
  shallower, 
  and 
  

   the 
  individuals 
  fuse 
  together 
  more 
  and 
  more, 
  the 
  nuclei 
  

   advance 
  towards 
  each 
  other 
  and 
  finally 
  unite. 
  I 
  have 
  once 
  

   observed 
  the 
  actual 
  fusion 
  of 
  the 
  nuclei. 
  During 
  this 
  they 
  do 
  

   not 
  undergo 
  any 
  change 
  of 
  structure, 
  but 
  the 
  newly 
  formed 
  

   nucleus 
  at 
  first 
  performs 
  small 
  amoeboid 
  movements. 
  The 
  

   tentacles 
  of 
  the 
  pairers 
  usually 
  disappear 
  at 
  the 
  commence- 
  

   ment 
  of 
  the 
  conjugation 
  ; 
  they 
  are 
  either 
  cast 
  off, 
  in 
  which 
  

   case 
  they 
  previously 
  become 
  converted 
  into 
  a 
  wrinkled 
  

   withered 
  thread, 
  or 
  they 
  are 
  gradually 
  drawn 
  in. 
  Conju- 
  

   gating 
  animals, 
  when 
  kept 
  in 
  the 
  moist 
  chamber, 
  frequently 
  

   become 
  so 
  much 
  exhausted 
  that 
  they 
  are 
  no 
  longer 
  in 
  a 
  con- 
  

   dition 
  to 
  bring 
  the 
  approximated 
  nuclei 
  to 
  amalgamation 
  ; 
  

   they 
  remain 
  alive 
  in 
  this 
  double-nucleate 
  condition 
  for 
  three 
  

   or 
  four 
  days, 
  and 
  during 
  this 
  period 
  each 
  of 
  them 
  sometimes 
  

   pushes 
  forth 
  a 
  tentacle. 
  

  

  According 
  to 
  Cienkowski 
  the 
  formation 
  of 
  the 
  swarm-buds 
  

   is 
  commenced 
  by 
  the 
  rising 
  of 
  two 
  projections 
  of 
  plasma 
  

   above 
  the 
  surface 
  of 
  the 
  globule. 
  These 
  afterwards 
  divide 
  

   into 
  four 
  projections, 
  then 
  again 
  into 
  eight, 
  and 
  so 
  on. 
  That 
  

   such 
  stages 
  with 
  two 
  and 
  four 
  projections 
  do 
  occur 
  is 
  certain, 
  

   but 
  certainly 
  they 
  do 
  not 
  always 
  occur, 
  for 
  I 
  often 
  found 
  

   only 
  a 
  thick 
  layer 
  of 
  plasma 
  with 
  a 
  few 
  nuclei, 
  which 
  pro- 
  

   jected 
  inwards 
  but 
  not 
  outwards. 
  We 
  are 
  indebted 
  to 
  Robin 
  

   for 
  statements 
  as 
  to 
  the 
  changes 
  which 
  the 
  nucleus 
  passes 
  

   through 
  in 
  its 
  successive 
  divisions 
  ; 
  but 
  such 
  metamorphoses 
  

   reminding 
  us 
  of 
  the 
  indirect 
  plan 
  only 
  occur 
  during 
  the 
  first 
  

   divisions 
  ; 
  subsequently, 
  as 
  I 
  have 
  frequently 
  observed, 
  it 
  

   breaks 
  up 
  only 
  by 
  simple 
  constriction. 
  

  

  The 
  development 
  of 
  the 
  cilia 
  does 
  not 
  always 
  occur 
  exactly 
  

   at 
  the 
  same 
  stage 
  of 
  growth 
  • 
  sometimes 
  they 
  occur 
  very 
  

   early, 
  when 
  the 
  individual 
  plasmatic 
  outgrowths 
  have 
  

   still 
  a 
  series 
  of 
  divisions 
  to 
  perform. 
  Then 
  it 
  may 
  also 
  

   happen 
  that 
  individual 
  buds 
  acquire 
  two 
  flagella. 
  The 
  form 
  

   of 
  the 
  swarmers 
  is 
  also 
  subject 
  to 
  many 
  variations, 
  as, 
  indeed, 
  

   was 
  already 
  observed 
  by 
  Cienkowski. 
  The 
  only 
  thing 
  that 
  

   calls 
  for 
  special 
  notice 
  is 
  the 
  circumstance 
  that 
  the 
  transverse 
  

  

  