﻿472 
  J. 
  W. 
  JENKINSON. 
  

  

  completely 
  into 
  line 
  with 
  the 
  phenomenon 
  of 
  artificial 
  

   parthenogenesis^ 
  a 
  phenomenon 
  which, 
  as 
  is 
  well 
  known, 
  

   Loeb 
  has 
  attributed 
  to 
  the 
  increased 
  osmotic 
  pressure 
  of 
  the 
  

   medium 
  in 
  which 
  the 
  eggs 
  are 
  placed. 
  

  

  But 
  whether 
  this 
  withdrawal 
  of 
  water 
  is 
  or 
  is 
  not 
  the 
  

   essential 
  factor 
  in 
  the 
  formation 
  of 
  the 
  wonderful 
  structures 
  

   we 
  observe 
  in 
  fertilisation, 
  whether 
  my 
  tentative 
  hypothesis 
  

   may 
  usefully 
  serve 
  as 
  a 
  light 
  to 
  lighten 
  the 
  path 
  of 
  other 
  

   investigators, 
  or 
  whether 
  it 
  is 
  destined 
  to 
  be 
  cast 
  into 
  the 
  

   outer 
  darkness 
  of 
  misguided 
  speculations, 
  I 
  hope 
  that 
  it 
  may 
  

   at 
  least 
  show 
  the 
  urgent 
  necessity 
  of 
  supplementing 
  the 
  

   descriptive 
  by 
  the 
  experimental 
  study 
  of 
  developmental 
  

   processes 
  ; 
  for 
  until 
  that 
  is 
  done 
  we 
  can 
  make 
  no 
  profitable 
  

   progress, 
  nor 
  can 
  our 
  theories 
  claim 
  to 
  be 
  scientific 
  in 
  the 
  

   fullest 
  sense 
  of 
  the 
  word. 
  

  

  OxFOED, 
  March, 
  1904. 
  

  

  List 
  of 
  Works 
  referred 
  to 
  in 
  the 
  Text. 
  

   Behkens, 
  G. 
  — 
  "Die 
  Reifung 
  uiid 
  Befruclitung 
  dcs 
  Forelleiieies," 
  ' 
  Aiiafc. 
  

  

  Hefte,' 
  X, 
  1898. 
  

   Berg, 
  W. 
  — 
  "Beit.iage 
  zur 
  Tlieorie 
  der 
  Fixation," 
  'A. 
  in. 
  A.,' 
  Ixii, 
  1903. 
  

   Blanc, 
  H. 
  — 
  "Etude 
  sur 
  la 
  fecondafion 
  de 
  I'oeuf 
  de 
  la 
  Truite," 
  ' 
  Bcr. 
  d. 
  

  

  Naturf. 
  Gez. 
  su 
  Freiburg 
  i. 
  B. 
  Festschr. 
  f. 
  Weismann,' 
  189i. 
  

  

  BoHM, 
  A. 
  A. 
  — 
  "Ueber 
  Reifung 
  undBefruchtuug 
  des 
  Eies 
  von 
  Petroniyzon 
  

   Planeri," 
  'A. 
  ni. 
  A.,' 
  xxxii, 
  1888. 
  

  

  Born, 
  G. 
  — 
  "Die 
  Slruktur 
  des 
  Keiniblascheus 
  im 
  Ovarialei 
  von 
  Triton 
  

  

  tseniatus,' 
  'A. 
  m. 
  A.,' 
  xliii, 
  1S94'. 
  

   BoVERl, 
  T. 
  — 
  "Zelleu-Studicn 
  I. 
  Die 
  Bilduiig 
  der 
  lliclitungskorper 
  bei 
  

  

  Ascaris 
  niegaloccpliala 
  uud 
  A. 
  1 
  umbricoides," 
  Jena, 
  1887. 
  

   BovERl, 
  T. 
  — 
  "Zellen-Studien 
  II. 
  Die 
  Befruclitung 
  und 
  Teilung 
  des 
  Eies 
  

  

  von 
  Ascaris 
  niegalocepli 
  ala,'' 
  Jena, 
  1888. 
  

   BoVERi, 
  T. 
  — 
  "Zellen-Studien 
  III. 
  Ueber 
  das 
  Verlialten 
  der 
  Cliromatisclien 
  

  

  Kernsubstanz 
  bei 
  der 
  Bildung 
  der 
  Kichtungslcorper 
  uud 
  bei 
  der 
  

  

  Befrucbtung," 
  Jena, 
  1890. 
  

   BovERi, 
  T.— 
  " 
  Zellen-Studien 
  IV. 
  Ueber 
  die 
  Natur 
  der 
  Centrosonien," 
  

  

  Jena, 
  1901. 
  

   Brauer, 
  a. 
  — 
  "Ueber 
  das 
  Ei 
  von 
  Brancliiims 
  Grubii 
  von 
  der 
  Bildung 
  bis 
  zur 
  

  

  Ablage," 
  ' 
  Pliys. 
  Abliandl. 
  k. 
  Ak. 
  VViss., 
  Berlin,' 
  1892. 
  

  

  