﻿(ESTEOUS 
  CYCLE 
  IN 
  TUE 
  COMMON 
  FERRET. 
  835 
  

  

  in 
  tlie 
  proximity 
  of 
  the 
  surface 
  epitlielium 
  ; 
  and 
  finally, 
  

   bleeding 
  into 
  the 
  cavity 
  takes 
  place. 
  The 
  whole 
  process, 
  

   therefore, 
  is 
  very 
  closely 
  comparable 
  to 
  what 
  occurs 
  with 
  

   monkeys 
  during 
  the 
  degeneration 
  period 
  of 
  menstruation 
  

   (Heape, 
  1894-, 
  1897). 
  There 
  is, 
  however, 
  no 
  pro-oestrous 
  clot 
  

   formed 
  in 
  the 
  ferret's 
  uterus, 
  the 
  discharge 
  seeming 
  to 
  be 
  

   disposed 
  of 
  very 
  gradually. 
  

  

  4. 
  Period 
  of 
  recuperation. 
  — 
  Fig. 
  7 
  (PL 
  20) 
  is 
  a 
  drawing 
  

   of 
  a 
  part 
  of 
  transverse 
  section 
  under 
  a 
  low 
  mngnification, 
  

   showing 
  the 
  relatively 
  large 
  cavity 
  and 
  correspondingly 
  

   slight 
  thickness 
  of 
  the 
  mucosa 
  during 
  an 
  eai-ly 
  stage 
  of 
  the 
  

   recuperation 
  period. 
  The 
  epithelium 
  is 
  almost 
  entirely 
  re- 
  

   formed, 
  but 
  is 
  somewhat 
  attenuated, 
  the 
  individual 
  cells 
  

   being 
  less 
  columnar 
  in 
  shape 
  than 
  they 
  are 
  normally. 
  Another 
  

   section 
  through 
  one 
  of 
  the 
  horns 
  of 
  the 
  same 
  uterus 
  is 
  

   represented 
  in 
  fig. 
  3 
  (PI. 
  19), 
  which 
  is 
  more 
  highly 
  magnified. 
  

   This 
  shows 
  that 
  the 
  nuclei 
  of 
  the 
  epithelium 
  are 
  more 
  

   irregularly 
  arranged 
  than 
  during 
  the 
  other 
  stages 
  of 
  the 
  

   cycle, 
  while 
  the 
  line 
  of 
  demarcation 
  between 
  epithelium 
  and 
  

   stroma 
  is 
  even 
  less 
  evident. 
  

  

  The 
  new 
  epithelium 
  is 
  formed, 
  for 
  the 
  most 
  part 
  at 
  any 
  

   rate, 
  either 
  from 
  that 
  covering 
  certain 
  particular 
  tracts 
  which 
  

   escaped 
  denudation, 
  or 
  from 
  the 
  epithelium 
  of 
  the 
  glands. 
  I 
  

   am 
  not 
  quite 
  certain, 
  however, 
  whether 
  the 
  whole 
  of 
  the 
  new 
  

   epithelium 
  arises 
  in 
  this 
  way, 
  for 
  the 
  absence 
  of 
  a 
  separating 
  

   line 
  between 
  this 
  layer 
  and 
  the 
  underlying 
  stroma, 
  and 
  the 
  

   irregular 
  arrangement 
  of 
  the 
  nuclei, 
  upon 
  which 
  I 
  have 
  

   commented 
  above, 
  suggest 
  that 
  parts 
  of 
  the 
  epithelium 
  may 
  

   be 
  re-formed 
  from 
  the 
  tissue 
  of 
  the 
  stroma. 
  This 
  is 
  the 
  view 
  

   adopted 
  by 
  Mr. 
  Heape 
  (1894, 
  1897) 
  regarding 
  the 
  manner 
  

   of 
  formation 
  of 
  the 
  new 
  epithelium 
  with 
  monkeys 
  during 
  the 
  

   recuperative 
  stage 
  of 
  mensti'uation. 
  

  

  During 
  the 
  earlier 
  stages 
  of 
  recuperation 
  a 
  variable 
  and 
  

   frequently 
  a 
  large 
  number 
  of 
  red 
  corpuscles, 
  accompanied 
  by 
  

   wandering 
  cells, 
  remain 
  scattered 
  free 
  in 
  the 
  stroma. 
  These 
  

   are 
  very 
  numerous 
  in 
  the 
  sections 
  represented 
  in 
  fig. 
  3 
  

   (PI. 
  19) 
  and 
  fig. 
  10 
  (PI. 
  21). 
  At 
  a 
  subsequent 
  stage 
  of 
  re- 
  

  

  