﻿554 
  J. 
  BRETLAND 
  PAliMER 
  AND 
  J. 
  B. 
  S. 
  MOOTIE. 
  

  

  then 
  the 
  result 
  cannot 
  be 
  expected 
  to 
  be 
  identical, 
  and 
  in 
  the 
  

   interaction 
  of 
  the 
  chromosomes 
  on 
  the 
  one 
  hand, 
  and 
  the 
  

   cytoplasm 
  on 
  the 
  other, 
  we 
  may 
  perhaps 
  find 
  a 
  clue 
  to 
  the 
  

   explanation 
  of 
  the 
  sudden 
  sports 
  and 
  other 
  variations 
  often 
  

   met 
  with 
  in 
  hybrids. 
  For 
  these 
  might 
  seem 
  at 
  first 
  sight 
  to 
  

   be 
  antagonistic 
  to 
  any 
  form 
  of 
  explanation 
  primarily 
  applic- 
  

   able 
  to 
  the 
  simpler 
  Mendelian 
  cases. 
  But 
  this 
  aspect 
  of 
  the 
  

   matter 
  is 
  clearly 
  a 
  matter 
  for 
  experimental 
  investigation, 
  and 
  

   we 
  have 
  only 
  introduced 
  it 
  in 
  this 
  place 
  because 
  we 
  think 
  

   that 
  the 
  conclusions 
  to 
  be 
  drawn 
  from 
  the 
  behaviour 
  of 
  the 
  

   nuclei 
  during 
  the 
  reduction 
  divisions 
  suggest 
  that 
  such 
  ex- 
  

   periments 
  would 
  probably 
  be 
  fruitful 
  in 
  results. 
  

  

  We 
  take 
  this 
  opportunity 
  of 
  expressing 
  our 
  sense 
  of 
  Pro- 
  

   fessor 
  Eay 
  Lankester's 
  kindness 
  in 
  discussing 
  with 
  us 
  the 
  

   questions 
  of 
  terminology 
  which 
  have 
  arisen 
  in 
  connection 
  with 
  

   the 
  subject 
  of 
  this 
  memoir. 
  

  

  EXPLANATION 
  OF 
  PLATES 
  34—41. 
  

  

  Illustrating 
  Prof. 
  J. 
  Bretland 
  Farmer's 
  and 
  Mr. 
  J. 
  E. 
  S. 
  Moore's 
  

   paper 
  " 
  On 
  the 
  Maiotic 
  Phase 
  (Reduction 
  Divisions) 
  in 
  

   Animals 
  and 
  Plants." 
  

  

  Tlie 
  figures 
  1 
  — 
  38 
  inclusive 
  refer 
  to 
  tlie 
  divisions 
  of 
  the 
  spore-mother-cells, 
  

   and 
  all 
  except 
  Pigs. 
  20, 
  21, 
  37, 
  and 
  38 
  refer 
  to 
  the 
  first 
  (heterotype) 
  mitosis. 
  

  

  Tlie 
  Figures 
  40 
  — 
  87 
  refer 
  to 
  the 
  somatic, 
  heterotype, 
  and 
  homotype 
  mitoses 
  

   of 
  Periplaneta 
  Americana. 
  

  

  Figs. 
  1 
  — 
  21. 
  — 
  Lilium 
  candidum. 
  

   Figs. 
  22 
  — 
  28. 
  — 
  Osmuuda 
  regalis. 
  

   Figs. 
  29, 
  30. 
  — 
  Psilotum 
  triquetrum. 
  

   Figs. 
  31 
  — 
  38. 
  — 
  Aneura 
  pinguis. 
  

  

  Fig. 
  39. 
  — 
  Diagrams 
  illustrating 
  various 
  interpretations 
  of 
  the 
  reduction 
  

   phenomena. 
  

   Figs. 
  40 
  — 
  52. 
  — 
  Periplaneta 
  Americana, 
  somatic 
  mitosis. 
  

   Figs. 
  53 
  — 
  79.— 
  ,, 
  heterotype 
  mitosis. 
  

  

  Yi"s. 
  80 
  — 
  87. 
  — 
  „ 
  homotype 
  mitosis. 
  

  

  