﻿THE 
  MAIOTIO 
  PHASE 
  IN 
  ANIMALS 
  AND 
  PLANTS. 
  501 
  

  

  his 
  account 
  failed 
  to 
  carry 
  conviction 
  because 
  it 
  was 
  evident 
  

   that 
  he 
  had 
  either 
  misinterpreted 
  the 
  longitudinal 
  fission 
  

   (which 
  does 
  actually 
  exist) 
  as 
  due^ 
  not 
  to 
  fission, 
  but 
  to 
  the 
  

   lateral 
  approximation 
  of 
  distinct 
  parts 
  of 
  the 
  spireme 
  thread, 
  

   or 
  else 
  he 
  overlooked 
  the 
  fission 
  altogether, 
  confusing 
  it 
  with 
  

   that 
  approximation 
  which 
  really 
  does 
  occur 
  at 
  the 
  later 
  

   stage. 
  To 
  judge 
  from 
  his 
  figures, 
  the 
  former 
  alternative 
  

   appears 
  to 
  express 
  the 
  real 
  explanation 
  of 
  his 
  results. 
  

   Schaffuer^ 
  in 
  his 
  investigations 
  on 
  Lilium 
  philadelphicum 
  

   undoubtedly 
  gave 
  a 
  correct 
  explanation, 
  in 
  all 
  important 
  

   respects, 
  oE 
  the 
  sequence 
  of 
  events 
  so 
  far 
  as 
  the 
  reduction 
  

   divisions 
  of 
  this 
  plant 
  are 
  concerned. 
  His 
  results, 
  however, 
  

   did 
  not 
  meet 
  with 
  the 
  reception 
  they 
  merited 
  because 
  

   they 
  were 
  overshadowed 
  by 
  statements 
  respecting 
  centro- 
  

   somes 
  which 
  were 
  in 
  contradiction 
  with 
  the 
  positive 
  results 
  

   of 
  all 
  the 
  most 
  careful 
  work 
  of 
  that 
  time. 
  

  

  Atkinson," 
  in 
  a 
  paper 
  on 
  the 
  reduction 
  divisions 
  in 
  

   Arisasma 
  and 
  Trillium 
  published 
  in 
  1899, 
  stated 
  that 
  

   the 
  reduction 
  was 
  qualitative, 
  i. 
  e. 
  essentially 
  consisted 
  in 
  

   the 
  transverse 
  division 
  of 
  bivalent 
  chromosomes. 
  But 
  he 
  

   suggested 
  that 
  in 
  the 
  former 
  plant 
  the 
  process 
  was 
  accom- 
  

   plished 
  during 
  the 
  heterotype, 
  whilst 
  in 
  Trillium 
  it 
  occurred 
  

   during 
  the 
  homotype, 
  mitosis. 
  We 
  have 
  had 
  the 
  opportunity, 
  

   through 
  the 
  kindness 
  of 
  Professor 
  Atkinson, 
  of 
  examining 
  

   some 
  of 
  his 
  slides 
  illustrating 
  each 
  of 
  these 
  plants, 
  and 
  we 
  

   are 
  quite 
  in 
  agreement 
  with 
  him 
  as 
  far 
  as 
  Arissema 
  is 
  con- 
  

   cerned. 
  With 
  respect 
  to 
  Trillium, 
  however, 
  the 
  material 
  

   at 
  our 
  disposal 
  did 
  not 
  enable 
  us 
  to 
  reach 
  a 
  definite 
  conclusion 
  ; 
  

   but 
  we 
  are 
  strongly 
  inclined 
  to 
  think 
  that 
  in 
  this 
  plant 
  also 
  

   the 
  qualitative 
  division 
  is 
  accomplished 
  during 
  the 
  hetero- 
  

   type 
  mitosis, 
  and 
  we 
  are 
  strengthened 
  in 
  this 
  by 
  a 
  study 
  

   of 
  the 
  excellent 
  series 
  of 
  figures 
  given 
  by 
  Ernst 
  ^ 
  in 
  his 
  

   memoir 
  dealing 
  with 
  Trillium 
  and 
  Paris. 
  The 
  appear- 
  

   ances 
  are 
  essentially 
  similar 
  to 
  those 
  met 
  with 
  in 
  Lilium 
  ; 
  and 
  

  

  ' 
  ' 
  Bot. 
  Gazette,' 
  vol. 
  xxiii. 
  

  

  ' 
  Ibid., 
  vol. 
  xxviii. 
  

  

  3 
  Ernst, 
  'Plora,'Bd. 
  xci. 
  

  

  