﻿THE 
  MAKiTIC 
  PHASE 
  IN 
  ANIMALS 
  AND 
  PLANTS. 
  545 
  

  

  tribution 
  of 
  the 
  chromatin 
  throughout 
  the 
  vesiculated 
  linin. 
  

   Indeed, 
  as 
  such 
  cases 
  as 
  those 
  represented 
  in 
  figs. 
  42-46 
  will 
  

   show 
  that, 
  when 
  the 
  linin 
  masses 
  begin 
  to 
  separate 
  and 
  

   contract, 
  and 
  the 
  chromatin 
  collects 
  along 
  the 
  axis 
  of 
  each 
  

   oiiginally 
  vesiculate 
  filament, 
  there 
  will 
  result 
  the 
  appearance 
  

   of 
  an 
  endless 
  spirem 
  which 
  has 
  generally 
  been 
  described. 
  

  

  However, 
  by 
  whatever 
  method 
  chromatin 
  thread-work 
  

   actually 
  originates, 
  it 
  generally 
  does 
  appear 
  later 
  as 
  an 
  intri- 
  

   cate 
  coiled 
  mass 
  of 
  chromatic 
  filaments, 
  and 
  these 
  filaments 
  

   eventually 
  separate 
  out 
  and 
  contract 
  into 
  the 
  characteristic 
  

   number 
  of 
  rod-like 
  somatic 
  chromosomes. 
  

  

  In 
  the 
  somatic 
  (anaschistic) 
  divisions 
  by 
  means 
  of 
  which 
  

   the 
  tissues 
  of 
  an 
  adult 
  multicellular 
  organism 
  are 
  graduall}^ 
  

   built 
  up 
  this 
  late 
  nuclear 
  spirem 
  sometimes, 
  but 
  by 
  no 
  means 
  

   always, 
  shows 
  indications 
  of 
  being 
  longitudinally 
  split 
  before 
  

   the 
  somatic 
  chromosomes 
  are 
  definitely 
  separated 
  out. 
  But 
  

   at 
  whatever 
  time 
  the 
  longitudinal 
  fission 
  first 
  becomes 
  

   actually 
  apparent, 
  it 
  is 
  always 
  to 
  be 
  seen 
  when 
  the 
  chromo- 
  

   somes 
  are 
  finally 
  grouped 
  upon 
  the 
  spindle 
  in 
  the 
  so-called 
  

   equatorial 
  plane 
  ; 
  and 
  this 
  splitting 
  invariably 
  provides 
  the 
  

   mechanism 
  by 
  which 
  the 
  halves 
  of 
  the 
  somatic 
  (anaschistic) 
  

   chromosomes 
  are 
  distributed 
  in 
  equal 
  numbers 
  among 
  the 
  

   daughter 
  nuclei 
  of 
  each 
  succeeding 
  generation 
  of 
  cells. 
  

  

  The 
  sharp 
  distinctions 
  between 
  the 
  innumerable 
  somatic 
  

   (anaschistic) 
  divisions 
  which 
  follow 
  one 
  another 
  during 
  the 
  

   ontogeny 
  of 
  a 
  multicellular 
  organism 
  and 
  the 
  single 
  hetero- 
  

   type 
  (diaschistic) 
  mitosis 
  whereby 
  certain 
  cells 
  of 
  the 
  body 
  

   are 
  ultimately 
  fitted 
  for 
  sexual 
  union, 
  is 
  brought 
  about 
  by 
  the 
  

   intercalation 
  of 
  a 
  series 
  of 
  definite 
  changes 
  which 
  are 
  

   characteristic 
  of 
  the 
  prophase 
  of 
  this 
  particular 
  division. 
  In 
  

   their 
  entirety, 
  these 
  added 
  portions 
  of 
  the 
  metamorphosis 
  

   constitute 
  what 
  has 
  already 
  been 
  distinguished 
  by 
  us 
  as 
  the 
  

   synaptic 
  change, 
  and 
  the 
  whole 
  process 
  of 
  synapsis 
  consists 
  

   essentially 
  of 
  the 
  following 
  successive 
  phases 
  : 
  

  

  Whilst 
  at 
  first 
  they 
  are 
  indistinguishable 
  from 
  the 
  resting 
  

   or 
  pre-maiotic 
  cells, 
  those 
  which 
  are 
  destined 
  to 
  proceed 
  to 
  the 
  

   heterotype 
  mitosis 
  become 
  at 
  first 
  characterised 
  by 
  the 
  closer. 
  

  

  