﻿582 
  .T. 
  E. 
  S. 
  MOORE 
  AND 
  L. 
  E. 
  ROBINSON. 
  

  

  Fig. 
  G. 
  — 
  Somatic 
  cell 
  with 
  fully 
  formed 
  spindle. 
  Fragments 
  of 
  the 
  nucleolus 
  

   in 
  the 
  cytoplasm. 
  

  

  Figs. 
  7, 
  8.— 
  Heterotype 
  cells 
  in 
  early 
  prophase. 
  Nucleolus 
  bifid. 
  

   Fig. 
  9. 
  — 
  Heterotype 
  cell 
  in 
  wliich 
  polarization 
  has 
  commenced. 
  The 
  

   nucleus 
  has 
  undergone 
  extrusion. 
  

  

  Fig. 
  10. 
  — 
  Heterotype 
  cell 
  in 
  condition 
  of 
  synapsis. 
  Loops 
  contracting 
  in 
  

   direction 
  of 
  archoplasm. 
  

  

  Fig. 
  11. 
  — 
  Heterotype 
  cell 
  in 
  late 
  synaptic 
  phase. 
  Nucleolus 
  reassuming 
  

   spherical 
  condition. 
  

  

  Fig. 
  12. 
  — 
  Heterotype 
  cell 
  in 
  which 
  the 
  loops 
  of 
  chromatin 
  are 
  extruded 
  

   out 
  on 
  the 
  periphery 
  of 
  the 
  nucleus, 
  the 
  nucleolus 
  lying 
  free 
  among 
  the 
  loops. 
  

  

  Fig. 
  13. 
  — 
  Heterotype 
  cell. 
  Later 
  stage 
  than 
  Fig. 
  12. 
  

  

  Fig. 
  14. 
  — 
  Heterotype 
  cell. 
  The 
  chromatic 
  loops 
  are 
  contracting 
  to 
  form 
  

   the 
  heterotype 
  ring 
  chromosomes. 
  

  

  Fig. 
  15. 
  — 
  Heterofype 
  cell. 
  King 
  chromosomes 
  separating. 
  Spindle 
  de- 
  

   veloping. 
  Nucleolar 
  fragments 
  passing 
  out 
  into 
  the 
  cytoplasm. 
  

  

  Fig. 
  16. 
  — 
  Heterotype 
  cell. 
  Chromosomes 
  dividing 
  on 
  the 
  spindle. 
  Nucle- 
  

   olar 
  fragments 
  in 
  the 
  cytoplasm. 
  

  

  Fig. 
  17. 
  — 
  Heterotype 
  cell 
  in 
  stage 
  of 
  diastes. 
  

  

  Fig. 
  18. 
  — 
  Heterotype 
  cell 
  in 
  stage 
  of 
  late 
  diastes. 
  A 
  cell 
  membrane 
  has 
  

   appeared, 
  dividing 
  the 
  cell 
  into 
  two 
  daughter 
  cells. 
  

  

  PLATE 
  45, 
  

  

  Figs. 
  19 
  — 
  21. 
  — 
  Homotype 
  cells 
  showing 
  stages 
  of 
  differentiation 
  of 
  the 
  

   chromosomes. 
  Fragments 
  of 
  heterotype 
  nucleolus 
  in 
  the 
  cytoplasm. 
  

  

  Fig. 
  22. 
  — 
  Homotype 
  cell. 
  Chromosomes 
  going 
  on 
  to 
  the 
  spindle. 
  

  

  Fig. 
  23. 
  — 
  Homotype 
  cell. 
  Spindle 
  with 
  chromosomes 
  on 
  equator. 
  

  

  Fig. 
  24.— 
  Homotype 
  cell. 
  Stage 
  of 
  diaster 
  with 
  dumb-bell-shaped 
  chromo- 
  

   somes. 
  

  

  Fig. 
  25. 
  — 
  Homotype 
  cell. 
  Late 
  diaster. 
  Daughter 
  cells 
  separated, 
  show, 
  

   ing 
  Flemming's 
  intermediate 
  body. 
  Fragments 
  of 
  heterotype 
  nucleolus 
  in 
  

   the 
  cytoplasm. 
  

  

  Fig. 
  26, 
  — 
  Homotype 
  cell. 
  Later 
  stage 
  than 
  Fig. 
  25, 
  showing 
  reconstruc- 
  

   tion 
  of 
  the 
  nuclei 
  in 
  the 
  daughter 
  cells. 
  

  

  Fig. 
  27. 
  — 
  Spermatid 
  showing 
  uebenkern. 
  Chromatin 
  breaking 
  down. 
  

  

  Fig, 
  28. 
  — 
  Spermatid. 
  The 
  nucleolus 
  is 
  differentiated. 
  Some 
  fragments 
  of 
  

   heterotype 
  nucleus 
  still 
  visible 
  in 
  the 
  cytoplasm. 
  

  

  Fig. 
  29. 
  — 
  Spermatid, 
  Later 
  stage 
  than 
  Fig. 
  28. 
  

  

  