﻿THE 
  MAIOTIC 
  PHASE 
  IN 
  AT^IMALS 
  AND 
  PLANTS. 
  557 
  

  

  Fig. 
  G8. 
  — 
  A 
  cell 
  in 
  about, 
  the 
  same 
  stage 
  as 
  in 
  fig. 
  G7. 
  

  

  Fig. 
  69. 
  — 
  Cell 
  in 
  still 
  later 
  stage, 
  where 
  the 
  second 
  or 
  " 
  synaptic 
  contrac- 
  

   tion 
  " 
  is 
  fully 
  formed 
  and 
  the 
  fission 
  of 
  the 
  thread 
  is 
  no 
  longer 
  visible. 
  

  

  Fig. 
  70. 
  — 
  The 
  same 
  stage, 
  another 
  view. 
  

  

  Fig. 
  71. 
  — 
  A 
  cell 
  in 
  which 
  the 
  loops 
  are 
  becoming 
  still 
  more 
  thick 
  and 
  

   contracted. 
  

  

  Fig. 
  72. 
  — 
  Cell 
  showing 
  the 
  condition 
  of 
  the 
  loops, 
  at 
  the 
  time 
  of 
  the 
  first 
  

   appearance 
  of 
  the 
  heterotype 
  spindle 
  figure. 
  

  

  Fig. 
  73. 
  — 
  Cell 
  in 
  which 
  the 
  spindle 
  figure 
  has 
  reached 
  a 
  later 
  stage 
  and 
  in 
  

   which 
  the 
  loops 
  which 
  now 
  constitute 
  the 
  heterotype 
  chromosomes 
  have 
  

   become 
  separated. 
  In 
  one 
  the 
  original 
  split 
  is 
  still, 
  however, 
  clearly 
  visible. 
  

  

  Fig. 
  7i. 
  — 
  Cell 
  showing 
  the 
  manner 
  in 
  which 
  the 
  heterotype 
  chromosomes 
  

   may 
  be 
  arranged 
  in 
  the 
  equatorial 
  plate 
  stage. 
  

   Fig. 
  75. 
  — 
  A 
  later 
  view 
  of 
  the 
  same. 
  

   Fig. 
  76. 
  — 
  Still 
  later 
  stage 
  in 
  the 
  heterotype 
  division. 
  

  

  Fig. 
  77. 
  — 
  Slightly 
  earlier 
  stage 
  with 
  the 
  heterotype 
  loops 
  spread 
  out 
  on 
  the 
  

   sjjindle, 
  and 
  their 
  separating 
  halves 
  showing 
  the 
  longitudinal 
  fission 
  as 
  they 
  

   divide. 
  

  

  Fig. 
  78. 
  — 
  Reconstruction 
  of 
  the 
  nuclei 
  after 
  the 
  heterotype 
  division. 
  

   Fig. 
  79.— 
  Later 
  stages 
  in 
  the 
  same. 
  

  

  Fig. 
  so. 
  — 
  Resting 
  cell 
  after 
  the 
  heterotype 
  division 
  and 
  before 
  the 
  homo- 
  

   type. 
  

  

  Figs. 
  SI 
  — 
  S3. 
  — 
  Stages 
  in 
  the 
  formation 
  of 
  the 
  homotype 
  chromosomes. 
  

   Fig. 
  Si. 
  — 
  First 
  appearance 
  of 
  the 
  homotype 
  spindle 
  figure. 
  

   Fig. 
  85. 
  — 
  Equatorial 
  plate 
  stage 
  of 
  the 
  homotype 
  division. 
  

   Figs. 
  80, 
  87. 
  — 
  Later 
  stages 
  of 
  the 
  homotype 
  division. 
  

  

  