﻿14 
  

  

  Merriman: 
  Conjugation 
  of 
  Spirogyra 
  ternata 
  

  

  the 
  broken 
  portion 
  (upon 
  lowering 
  the 
  coverglass) 
  being 
  reversed 
  

   from 
  its 
  original 
  position. 
  Fig. 
  i 
  shows 
  these 
  threads 
  as 
  drawn 
  

   originally, 
  while 
  Fig. 
  2, 
  made 
  by 
  reversing 
  a 
  model 
  of 
  the 
  broken 
  

   threads, 
  shows 
  them 
  as 
  they 
  were 
  in 
  their 
  first 
  position 
  except 
  for 
  

   the 
  break. 
  The 
  rupture 
  of 
  the 
  thread 
  reveals 
  the 
  previous 
  

   tension 
  of 
  the 
  cells. 
  Upon 
  severing 
  the 
  9 
  thread 
  at 
  G 
  and 
  then 
  

   placing 
  the 
  terminal 
  cell 
  H 
  of 
  the 
  d" 
  thread 
  next 
  to 
  the 
  cell 
  F 
  from 
  

   which 
  it 
  was 
  broken, 
  the 
  9 
  thread, 
  by 
  reason 
  of 
  the 
  relaxation 
  of 
  

   the 
  c^ 
  cells 
  in 
  the 
  breaking 
  of 
  the 
  thread, 
  lacks 
  45 
  mm. 
  of 
  meeting 
  

   the 
  cell 
  E 
  in 
  the 
  figure. 
  When, 
  on 
  the 
  contrary, 
  the 
  cell 
  G 
  is 
  

   placed 
  next 
  to 
  E, 
  as 
  in 
  the 
  model 
  of 
  the 
  reversed 
  cells, 
  the 
  thread 
  

   shows 
  a 
  marked 
  linear 
  extension, 
  indicated 
  by 
  the 
  distance 
  from 
  

  

  H 
  

  

  W 
  

  

  extension 
  is 
  measured 
  by 
  adding 
  the 
  distances 
  between 
  transverse 
  

  

  A 
  

  

  B 
  

  

  Fig. 
  3. 
  

  

  walls 
  as 
  measured 
  with 
  the 
  ocular 
  micrometer. 
  

  

  transverse 
  

  

  walls 
  It 
  gives 
  an 
  excess 
  of 
  43 
  mm.; 
  when 
  measured 
  by 
  a 
  thread 
  

   allowmg 
  for 
  the 
  curving 
  walls, 
  it 
  gives 
  an 
  excess 
  of 
  55 
  mm 
  These 
  

   figures 
  are 
  an 
  index 
  of 
  the 
  amount 
  of 
  compression 
  of 
  the 
  d' 
  thread 
  

   at 
  this 
  region 
  of 
  curvature. 
  

  

  _■ 
  

  

  The 
  9 
  thread 
  in 
  this 
  curved 
  series, 
  as 
  shown 
  in 
  Table 
  I, 
  

   consists 
  of 
  ninety-five 
  cells; 
  thirty-six 
  of 
  these 
  are 
  conjugating 
  

  

  