﻿16 
  

  

  Merriman: 
  Co^7UGATION 
  of 
  Spirogyr.\ 
  terxata 
  

  

  walls 
  in 
  each 
  sexual 
  cell. 
  The 
  significance 
  of 
  these 
  measurements 
  

   can 
  be 
  seen 
  more 
  clearly 
  by 
  taking 
  as 
  an 
  illustration 
  a 
  single 
  pair 
  of 
  

   cells, 
  as 
  in 
  the 
  accompanying 
  Fig. 
  I, 
  A 
  <^ 
  cell, 
  ABCD, 
  has 
  an 
  

   outer 
  wall, 
  AB^ 
  measuring 
  in 
  a 
  straight 
  line 
  93 
  n 
  between 
  the 
  

  

  simi 
  

  

  betwee 
  

  

  inner 
  wall, 
  from 
  which 
  the 
  conjugating 
  tube 
  emerges. 
  If 
  the 
  

   walls 
  were 
  originally 
  an 
  equal 
  distance 
  apart, 
  as 
  is 
  the 
  case 
  in 
  

   filaments 
  where 
  all 
  the 
  cells 
  are 
  non-conjugating 
  and 
  where 
  

   external 
  conditions 
  are 
  such 
  as 
  to 
  cause 
  no 
  marked 
  inequalities 
  

   of 
  growth 
  in 
  the 
  two 
  sides 
  of 
  the 
  cells, 
  A 
  and 
  B 
  of 
  the 
  cf 
  cell 
  are 
  

   brought 
  nearer 
  together, 
  as 
  conjugation 
  proceeds, 
  while 
  C 
  and 
  D 
  

   are 
  spread 
  farther 
  apart. 
  Internal 
  pressure, 
  the 
  result 
  of 
  the 
  

   metabolic 
  activities 
  of 
  the 
  protoplast, 
  must 
  cause 
  this 
  distension 
  

   of 
  CD. 
  In 
  the 
  9 
  cell 
  there 
  is 
  either 
  no 
  change 
  whatever 
  in 
  the 
  

   distance 
  of 
  G 
  from 
  H 
  or 
  only 
  a 
  slight 
  increase* 
  A 
  study 
  of 
  the 
  

  

  

  

  

  

  TABLE 
  III 
  

  

  

  

  

  

  

  

  V 
  

  

  Cells 
  A 
  — 
  -B 
  inclusive 
  

  

  « 
  

  

  

  

  

  

  Lengths 
  givejt 
  in 
  microns 
  

  

  

  

  Number 
  ■ 
  

  

  Length 
  

  

  Length 
  

  

  Outer 
  wall 
  

  

  Conju- 
  

  

  Number 
  

  

  Length 
  

  

  Length 
  

  

  Outer 
  wall 
  

  

  of 
  9 
  cell 
  \' 
  

  

  outer 
  wall 
  

  

  inner 
  wall 
  

  

  increase 
  gating 
  with 
  

  

  of 
  <? 
  cell 
  

  

  outer 
  wall 
  

  

  inner 
  wall 
  I 
  

  

  decrease 
  

  

  X 
  

  

  64 
  

  

  61 
  

  

  3 
  

  

  

  I 
  

  

  107 
  

  

  114 
  

  

  " 
  7 
  

  

  2 
  

  

  50 
  

  

  50 
  

  

  

  

  

  

  

  

  

  3 
  

  

  71 
  

  

  71 
  

  

  

  

  

  2 
  

  

  100 
  

  

  96 
  

  

  + 
  4 
  

  

  4 
  

  

  43 
  

  

  43 
  

  

  

  

  

  3 
  

  

  82 
  

  

  

  

  86 
  

  

  - 
  4 
  

  

  S 
  

  

  S3 
  

  

  50 
  

  

  3 
  

  

  

  

  

  

  

  6 
  

  

  64 
  

  

  64 
  

  

  

  

  

  4 
  

  

  79 
  

  

  89 
  

  

  — 
  10 
  

  

  7 
  

  

  43 
  

  

  1 
  36 
  

  

  7 
  

  

  

  

  1 
  ♦ 
  

   1 
  

  

  

  

  8 
  

  

  57 
  

  

  50 
  

  

  7 
  

  

  

  5 
  

  

  79 
  

  

  79 
  

  

  

  

  9 
  

  

  61 
  

  

  57 
  

  

  4 
  

  

  

  

  

  

  

  10 
  

  

  57 
  

  

  57 
  

  

  

  

  

  1 
  

  

  6 
  

  

  79 
  

  

  86 
  

  

  - 
  7 
  

  

  II 
  

  

  50 
  

  

  SO 
  

  

  

  

  

  

  

  

  

  12 
  

  

  71 
  

  

  64 
  

  

  1 
  

  

  7 
  

  

  1 
  

  

  

  7 
  

  

  71 
  

  

  86 
  

  

  -15 
  

  

  13 
  

  

  57 
  

  

  S7 
  

  

  1 
  

  

  1 
  

  

  

  

  

  8 
  

  

  64 
  

  

  71 
  

  

  - 
  7 
  

  

  14 
  

  

  50 
  

  

  SO 
  

  

  

  

  

  

  

  

  

  1 
  

  

  15 
  

  

  64 
  

  

  64 
  

  

  

  

  

  9 
  

  

  71 
  

  

  86 
  

  

  -IS 
  

  

  16 
  

  

  64 
  

  

  57 
  

  

  7 
  

  

  

  

  

  ] 
  

  

  

  17 
  

  

  79 
  

  

  57 
  

  

  22 
  

  

  

  10 
  

  

  107 
  

  

  129 
  

  

  —22 
  

  

  18 
  

  

  50 
  

  

  50 
  

  

  

  

  

  

  » 
  

  

  

  

  19 
  

  

  79 
  

  

  71 
  

  

  8 
  

  

  

  II 
  

  

  100 
  

  

  107 
  

  

  - 
  7 
  

  

  20 
  

  

  64 
  

  

  64 
  

  

  

  

  

  

  

  W 
  

  

  ^ 
  

   ^ 
  

  

  21 
  

  

  61 
  

  

  SO 
  

  

  II 
  

  

  

  12 
  

  

  50 
  

  

  71 
  

  

  — 
  21 
  

  

  22 
  

  

  79 
  

  

  71 
  

  

  8 
  

  

  

  13 
  

  

  86 
  

  

  100 
  

  

  -14 
  

  

  23 
  

  

  64 
  

  

  50 
  

  

  14 
  

  

  

  14 
  

  

  79 
  

  

  79 
  

  

  

  

  24 
  

  

  64 
  

  

  57 
  

  

  7 
  

  

  

  15 
  

  

  79 
  

  

  100 
  

  

  —21 
  

  

  25 
  

  

  71 
  

  

  71 
  

  

  

  

  

  

  

  

  

  26 
  

  

  43 
  

  

  36 
  

  

  7 
  

  

  

  

  

  T 
  

  

  