﻿JVIerrimax: 
  Conjugation 
  of 
  Spirogyra 
  ternata 
  

  

  17 
  

  

  membranes 
  joining 
  the 
  completely 
  formed 
  conjugating 
  tubes 
  

   shows 
  that 
  the 
  center 
  of 
  the 
  tube 
  pushes 
  against 
  the 
  wall, 
  forming 
  

   a 
  secondary 
  smaller 
  tube 
  shown 
  in 
  the 
  diagram. 
  Probably 
  it 
  is 
  

   the 
  stretching 
  of 
  the 
  wall 
  as 
  this 
  tube 
  presses 
  against 
  the 
  wall 
  of 
  

   the 
  cell 
  that 
  brings 
  E 
  and 
  7^ 
  nearer 
  together. 
  

  

  Inspection 
  of 
  the 
  Tables 
  III 
  and 
  IV, 
  representing 
  measure- 
  

  

  w 
  

  

  ments 
  of 
  the 
  cells 
  where 
  the 
  curves 
  in 
  the 
  filaments 
  were 
  greatest, 
  

  

  TABLE 
  IV 
  

  

  Cells 
  C 
  — 
  D 
  inclusive 
  

   Lengths 
  given 
  in 
  microns 
  

  

  Number 
  Length 
  

   of 
  9 
  cell 
  ;OUter 
  wail 
  

  

  Length 
  

   inner 
  wall 
  

  

  f 
  

  

  I 
  

   2 
  

  

  3 
  

  

  4 
  

  

  S 
  

   6 
  

  

  7 
  

  

  8 
  

  

  9 
  

  

  JO 
  

  

  II 
  

  

  12 
  

  

  13 
  

  

  14 
  

  

  15 
  

   i6 
  

  

  17 
  

   i8 
  

  

  19 
  

  

  20 
  

   21 
  

  

  6l 
  

  

  43 
  

  

  57 
  

   64 
  

  

  71 
  

  

  57 
  

  

  43 
  

  

  71 
  

   50 
  

  

  64 
  

  

  57 
  

   64 
  

  

  57 
  

  

  71 
  

   50 
  

  

  57 
  

   42 
  

  

  57 
  

   57 
  

  

  35 
  

  

  50 
  

  

  Outer 
  wall 
  

   increase 
  

  

  50 
  

   36 
  

  

  50 
  

   50 
  

  

  71 
  

  

  57 
  

  

  43 
  

   64 
  

   50 
  

  

  64 
  

   50 
  

  

  57 
  

   43 
  

  

  64 
  

  

  43 
  

  

  57 
  

   42 
  

  

  28 
  

  

  50 
  

  

  35 
  

   50 
  

  

  II 
  

  

  7 
  

  

  7 
  

  

  14 
  

   o 
  

  

  o 
  

   o 
  

  

  7 
  

   o 
  

  

  o 
  

  

  7 
  

  

  7 
  

  

  14 
  

  

  7 
  

  

  7 
  

   o 
  

  

  o 
  

  

  29 
  

  

  7 
  

   

  

  o 
  

  

  Conju- 
  

   gating 
  with 
  

  

  < 
  — 
  > 
  

  

  Number 
  

   of 
  cf 
  cell 
  

  

  Length 
  

   outer 
  wail 
  

  

  Length 
  

   inner 
  wall 
  

  

  Outer 
  wall 
  

   decrease 
  

  

  < 
  > 
  

  

  < 
  > 
  

  

  I 
  

  

  2 
  

  

  86 
  

   79 
  

  

  3 
  

  

  4 
  

  

  < 
  > 
  

  

  5 
  

  

  6 
  

  

  79 
  

   79 
  

  

  100 
  

   1 
  00 
  

  

  14 
  

   21 
  

  

  100 
  

  

  100 
  

   86 
  

  

  114 
  

  

  < 
  > 
  

  

  < 
  > 
  

  

  < 
  > 
  

  

  7 
  

  

  8 
  

  

  71 
  

  

  93 
  

  

  100 
  

  

  21 
  

  

  7 
  

  

  79 
  

  

  107 
  

  

  14 
  

  

  8 
  

  

  9 
  

  

  10 
  

  

  III 
  

  

  SO 
  

  

  107 
  

  

  14 
  

  

  128 
  

   86 
  

  

  7 
  

  

  17 
  

   36 
  

  

  A 
  — 
  B 
  and 
  C 
  — 
  D 
  inclusive, 
  show 
  the 
  opposing 
  numerical 
  relations 
  

   between 
  the 
  outer 
  and 
  inner 
  walls 
  of 
  the 
  two 
  series. 
  

  

  From 
  the 
  comparison 
  of 
  the 
  increases 
  and 
  decreases 
  in 
  the 
  

   lengths 
  of 
  the 
  walls 
  in 
  the 
  two 
  filaments 
  a 
  marked 
  tendency 
  is 
  

   apparent 
  toward 
  lengthening 
  the 
  inner 
  distance 
  between 
  the 
  

   transverse 
  walls 
  of 
  the 
  cf 
  cells, 
  the 
  corresponding 
  distance 
  be- 
  

   tween 
  the 
  transverse 
  walls 
  of 
  the 
  9 
  cells 
  remaining 
  the 
  same 
  or 
  

   showing 
  a 
  slight 
  decrease. 
  The 
  changes 
  in 
  length 
  are 
  brought 
  

   about 
  just 
  before 
  and 
  during 
  the 
  process 
  of 
  conjugation. 
  There 
  

   is 
  no 
  reduction 
  to 
  be 
  seen 
  in 
  any 
  of 
  the 
  outer 
  walls 
  of 
  the 
  9 
  cells 
  

   in 
  these 
  series, 
  their 
  excess 
  lengths 
  varying 
  from 
  zero 
  up 
  to 
  22 
  /x. 
  

   In 
  the 
  case 
  of 
  the 
  seventeenth 
  cell, 
  where 
  there 
  is 
  the 
  unusual 
  in- 
  

  

  