﻿342 
  FRANCIS 
  H. 
  A. 
  MARSHALL. 
  

  

  It 
  seems 
  possible 
  that 
  the 
  formation 
  of 
  the 
  corpus 
  luteum 
  

   marks 
  a 
  change 
  in 
  the 
  character 
  of 
  the 
  ovarian 
  secretion, 
  

   which, 
  in 
  the 
  presence 
  of 
  that 
  structure, 
  may 
  have 
  regard 
  

   especially 
  to 
  the 
  preparation 
  of 
  the 
  uterus 
  for 
  pregnancy 
  and 
  

   the 
  attachment 
  of 
  the 
  ovum, 
  and 
  perhaps 
  even 
  the 
  suppres- 
  

   sion, 
  so 
  to 
  speak, 
  of 
  a 
  pro-oestrous 
  or 
  cestrous 
  secretion 
  during 
  

   gestation. 
  When, 
  as 
  is 
  sometimes 
  the 
  case 
  with 
  the 
  ferret, 
  

   ovulation 
  does 
  not 
  take 
  place 
  during 
  the 
  "lieat^' 
  period, 
  the 
  

   persistence 
  of 
  the 
  oestrus 
  may 
  possibly 
  be 
  directly 
  correlated 
  

   with 
  the 
  absence 
  of 
  the 
  corpora 
  lutea. 
  

  

  But 
  whereas 
  such 
  suggestions 
  in 
  the 
  present 
  state 
  of 
  our 
  

   knowledge 
  are 
  of 
  course 
  highly 
  speculative, 
  the 
  results 
  of 
  

   recent 
  experiments 
  seem 
  to 
  me 
  to 
  point 
  to 
  the 
  conclusion 
  that 
  

   the 
  solutions 
  of 
  some 
  of 
  the 
  problems 
  concerning 
  the 
  oestrous 
  

   cycle 
  and 
  the 
  ripening 
  and 
  final 
  rupture 
  of 
  the 
  Graafian 
  

   follicles, 
  will 
  be 
  found 
  in 
  the 
  study 
  of 
  the 
  ovary 
  as 
  an 
  organ 
  

   of 
  internal 
  secretion. 
  

  

  Postscript. 
  

  

  Since 
  concluding 
  the 
  present 
  paper 
  I 
  have 
  read 
  Sandes' 
  

   account 
  of 
  the 
  formation 
  of 
  the 
  corpus 
  luteum 
  in 
  Dasyurus, 
  

   of 
  which 
  1 
  had 
  previously 
  only 
  seen 
  an 
  abstract 
  (see 
  p. 
  330). 
  

   It 
  is 
  to 
  be 
  noted 
  that 
  this 
  author, 
  although 
  stating 
  in 
  his 
  

   summary 
  of 
  conclusions 
  that 
  'Hhe 
  corpus 
  luteum 
  atreticum 
  

   is 
  formed 
  in 
  the 
  same 
  way 
  as 
  the 
  corpus 
  luteum 
  verum," 
  

   says 
  also 
  that 
  " 
  other 
  atresic 
  follicles 
  are 
  reduced 
  to 
  fibrous 
  

   tissue 
  or 
  remain 
  cystic." 
  In 
  the 
  body 
  of 
  the 
  paper 
  he 
  

   describes 
  the 
  former 
  process 
  as 
  occurring 
  only 
  in 
  atretic 
  

   follicles 
  which 
  had 
  become 
  ripe, 
  or 
  nearly 
  so, 
  but 
  in 
  which 
  

   the 
  ovum 
  had 
  not 
  been 
  discharged. 
  In 
  the 
  case 
  of 
  the 
  

   smaller 
  follicles 
  Sandes 
  describes 
  the 
  follicular 
  epithelium 
  as 
  

   frequently 
  degenerating 
  but 
  never 
  hypertrophy 
  iug. 
  

  

  Two 
  new 
  articles 
  on 
  the 
  gestation 
  of 
  the 
  badger 
  by 
  Mr. 
  

   A. 
  H. 
  Cocks 
  have 
  lately 
  been 
  published 
  in 
  the 
  ^Zoologist.' 
  

   In 
  the 
  last 
  article 
  Mr. 
  Cocks 
  arrives 
  at 
  the 
  remarkable 
  con- 
  

   clusion 
  "that 
  the 
  pairing 
  may 
  take 
  place 
  at 
  any 
  time 
  during 
  

  

  