﻿20 
  

  

  Merriman 
  

  

  RA 
  

  

  determine 
  whether 
  in 
  dioecious 
  plants 
  there 
  Is 
  a 
  corresponding 
  

   difference 
  In 
  the 
  rate 
  of 
  metabolic 
  exchange. 
  

  

  Since 
  the 
  c? 
  gamete 
  of 
  Spirogyra, 
  in 
  contrast 
  to 
  the 
  sperma- 
  

   tozoon 
  of 
  animals, 
  carries 
  with 
  it 
  to 
  the 
  receiving 
  gamete 
  stored 
  

   food 
  as 
  accretions 
  about 
  the 
  pyrenoids, 
  a 
  high 
  percentage 
  of 
  

   stored 
  material 
  does 
  not 
  occur 
  in 
  the 
  9 
  cell 
  until 
  after 
  conju- 
  

   gation 
  is 
  completed. 
  The 
  large 
  proportion 
  of 
  swollen 
  cells, 
  both 
  

   with 
  and 
  without 
  conjugating 
  tubes, 
  and 
  the 
  fact 
  that 
  no 
  visible 
  

   movement 
  of 
  solid 
  parts 
  has 
  as 
  yet 
  begun 
  in 
  the 
  conjugating 
  cells 
  

   indicate 
  that 
  the 
  different 
  tensions 
  shown 
  by 
  the 
  measurements 
  

  

  ^ 
  

  

  of 
  the 
  sex 
  cells 
  are 
  to 
  be 
  causally 
  connected 
  with 
  the 
  differing 
  

  

  amounts 
  of 
  tumidity 
  and 
  

   metabolism 
  in 
  the 
  sex 
  cells. 
  

  

  this 
  in 
  turn 
  with 
  different 
  types 
  of 
  

  

  It 
  w^ould 
  be 
  premature 
  to 
  draw 
  final 
  conclusions 
  from 
  the 
  

   intensive 
  study 
  of 
  but 
  one 
  series. 
  The 
  comparison 
  of 
  Series 
  A 
  

   with 
  other 
  series 
  observed, 
  the 
  tabulation 
  of 
  results 
  and 
  deductions 
  

   as 
  to 
  potency 
  of 
  cells, 
  formation 
  of 
  tubes 
  and 
  other 
  related 
  prob- 
  

   lems 
  must 
  be 
  reserved 
  for 
  another 
  paper. 
  

  

  Hunter 
  College, 
  New 
  York 
  City 
  

  

  Literature 
  cited 
  

  

  I. 
  Bessey, 
  C.E. 
  Hybndisation 
  in 
  Spirogyra. 
  Am. 
  Nat. 
  20: 
  68. 
  ' 
  1884. 
  

  

  The 
  green 
  algae 
  of 
  North 
  America. 
  Tufts 
  Coll. 
  

  

  Collins 
  

  

  ^48 
  

  

  1909. 
  

  

  3. 
  Cunningham, 
  B. 
  Sexuality 
  of 
  filament 
  of 
  Spirogyra. 
  Bot. 
  Gaz. 
  63 
  : 
  

  

  48^5 
  

  

  Riddle 
  

  

  23-25- 
  1917- 
  

  

  The 
  control 
  of 
  the 
  sex 
  ratio. 
  J 
  

  

  9-356 
  

  

  1917. 
  

  

  5. 
  Robertson, 
  R. 
  A. 
  On 
  abnormal 
  conjugation 
  in 
  Spiroygra. 
  Trans. 
  

   Bot. 
  Soc. 
  Edinburgh 
  21: 
  185-191. 
  1899. 
  

  

  ^ 
  h 
  

  

  