﻿164 
  

  

  Mr. 
  C. 
  F. 
  U. 
  Meek. 
  

  

  in 
  a 
  way 
  similar 
  to 
  that 
  suggested 
  ; 
  on 
  the 
  other 
  hand, 
  the 
  process 
  may 
  be 
  

   entirely 
  different. 
  

  

  That 
  the 
  complex 
  of 
  a 
  species 
  is 
  a 
  constant 
  seems 
  more 
  and 
  more 
  evident 
  ; 
  

   and, 
  within 
  small 
  groups 
  of 
  the 
  animal 
  kingdom, 
  we 
  can 
  foretell 
  the 
  approxi- 
  

   mate 
  composition 
  of 
  the 
  complex 
  in 
  a 
  particular 
  species. 
  This 
  has 
  led 
  to 
  the 
  

   supposition 
  that, 
  throughout 
  the 
  animal 
  kingdom, 
  a 
  classification 
  based 
  upon 
  

   chromosomes 
  will 
  be 
  found 
  to 
  correspond 
  with 
  the 
  classification 
  based 
  upon 
  

   somatic 
  characters. 
  That 
  this 
  is 
  not 
  so 
  has 
  been 
  clearly 
  demonstrated 
  by 
  

   comparison 
  of 
  the 
  photo-micrographs 
  given 
  in 
  this 
  paper. 
  Our 
  studies 
  of 
  

   chromosomes 
  have 
  failed 
  completely 
  to 
  discover 
  the 
  factors 
  determining 
  the 
  

   composition 
  of 
  the 
  complex. 
  

  

  The 
  phenomena 
  of 
  the 
  cell 
  must 
  be 
  intimately 
  connected. 
  The 
  evolution 
  

   of 
  the 
  spindle 
  cannot 
  be 
  dissociated 
  from 
  that 
  of 
  the 
  chromosomes 
  ; 
  and 
  

   elucidation 
  of 
  the 
  one 
  problem 
  will 
  lead 
  probably 
  to 
  elucidation 
  of 
  the 
  other. 
  

   How 
  and 
  when 
  elucidation 
  will 
  be 
  found 
  cannot 
  be 
  prophesied. 
  Both 
  

   problems 
  are 
  important 
  ; 
  and 
  both 
  are 
  difficult. 
  

  

  Sximmary. 
  

  

  1. 
  The 
  degree 
  of 
  somatic 
  complexity 
  of 
  an 
  animal 
  cannot 
  be 
  correlated 
  

   with 
  the 
  lengths 
  of 
  the 
  chromosomes 
  composing 
  its 
  complex. 
  

  

  2. 
  The 
  degree 
  of 
  somatic 
  complexity 
  of 
  an 
  animal 
  cannot 
  be 
  correlated 
  

   with 
  the 
  diameters 
  of 
  the 
  chromosomes 
  composing 
  its 
  complex. 
  

  

  3. 
  The 
  degree 
  of 
  somatic 
  complexity 
  of 
  an 
  animal 
  cannot 
  be 
  correlated 
  

   with 
  the 
  total 
  volume 
  of 
  the 
  chromosomes 
  composing 
  its 
  complex. 
  

  

  4. 
  The 
  degree 
  of 
  somatic 
  complexity 
  of 
  an 
  animal 
  cannot 
  be 
  correlated 
  

   with 
  the 
  number 
  of 
  the 
  chromosomes 
  composing 
  its 
  complex. 
  

  

  5. 
  There 
  are 
  many 
  different 
  chromosome 
  diameters. 
  

  

  6. 
  The 
  chromosomes 
  composing 
  the 
  spermatogonial 
  complex 
  of 
  an 
  animal 
  

   are 
  not 
  necessarily 
  identical 
  in 
  diameter 
  with 
  those 
  composing 
  its 
  secondary 
  

   spermatocyte 
  complex. 
  

  

  7. 
  All 
  chromosomes 
  composing 
  an 
  individual 
  complex 
  are 
  not 
  necessarily 
  

   of 
  the 
  same 
  diameter. 
  

  

  BIBLIOGKAPHY. 
  

  

  Farmer, 
  J. 
  B., 
  and 
  Digby, 
  L., 
  " 
  On 
  Dimensions 
  of 
  Chromosomes 
  considered 
  in 
  Eolation 
  

  

  to 
  Phytogeny," 
  ' 
  Phil. 
  Trans. 
  Eoy. 
  Soc.,' 
  Ser. 
  B, 
  vol. 
  205 
  (1914). 
  

   Federley, 
  H., 
  " 
  Chromosomenstudien 
  an 
  Mischlingen," 
  ' 
  Finska 
  Vetenskaps-Societetens 
  

  

  Forhandlingar,' 
  Bd. 
  57 
  (1914-15). 
  

   Meek, 
  C. 
  F. 
  TJ., 
  " 
  A 
  Metrical 
  Analysis 
  of 
  Chromosome 
  Complexes," 
  ' 
  Phil. 
  Trans. 
  Koy. 
  

  

  Soc.,' 
  Ser. 
  B, 
  vol. 
  203 
  (1912). 
  

   Winiwarter, 
  H. 
  de, 
  "Les 
  Mitoses 
  de 
  l'epithelium 
  seminal 
  du 
  Chat," 
  'Arch, 
  de 
  Biol.,' 
  

  

  t. 
  30 
  (1919). 
  (Depos<§ 
  le 
  17 
  Mars, 
  1914.) 
  

  

  