﻿336 
  FRANCIS 
  H. 
  A. 
  MARSHALL. 
  

  

  cuperation 
  these 
  extravasated 
  corpuscles 
  are 
  no 
  longer 
  seen 
  

   in 
  any 
  quantity, 
  while 
  numerous 
  small 
  blood-vessels 
  appear 
  

   to 
  have 
  been 
  formed. 
  In 
  the 
  case 
  of 
  the 
  sheep, 
  it 
  has 
  been 
  

   shown 
  that 
  the 
  blood 
  which 
  is 
  extravasated 
  during 
  the 
  pro- 
  

   cestrum, 
  and 
  which 
  is 
  not 
  discharged 
  into 
  the 
  cavity 
  of 
  the 
  

   uterus, 
  forms 
  pigment 
  in 
  the 
  mucosa. 
  On 
  the 
  other 
  hand, 
  I 
  

   have 
  never 
  found 
  any 
  trace 
  of 
  pigment 
  formation 
  in 
  the 
  

   uterine 
  mucosa 
  of 
  the 
  ferret, 
  while 
  sections 
  of 
  this 
  tissue 
  

   from 
  animals 
  with 
  which 
  recuperation 
  had 
  lately 
  commenced 
  

   support 
  the 
  view 
  tliat 
  the 
  corpuscles 
  are 
  gathered 
  up 
  afresh 
  

   into 
  the 
  circulatory 
  system 
  by 
  becoming 
  enclosed 
  within 
  the 
  

   walls 
  of 
  newly 
  formed 
  blood-vessels. 
  It 
  is 
  a 
  matter 
  of 
  difh- 
  

   cnlty 
  in 
  a 
  case 
  of 
  this 
  sort 
  to 
  make 
  quite 
  sure 
  of 
  the 
  

   correctness 
  of 
  one's 
  interpretation 
  of 
  a 
  series 
  of 
  sections, 
  but 
  

   unless 
  this 
  explanation, 
  which 
  is 
  in 
  agreement 
  with 
  Mr. 
  

   Heape's 
  description 
  of 
  what 
  occurs 
  with 
  monkeys, 
  is 
  adopted, 
  

   I 
  am 
  unable 
  to 
  account 
  for 
  the 
  disappearance 
  of 
  the 
  extrava- 
  

   sated 
  corpuscles 
  during 
  the 
  later 
  stages 
  of 
  recuperation. 
  

  

  At 
  a 
  subsequent 
  stage 
  of 
  this 
  period 
  the 
  stroma 
  tissue 
  tends 
  

   to 
  become 
  more 
  and 
  more 
  dense, 
  and 
  also 
  to 
  increase 
  in 
  

   thickness, 
  until 
  the 
  mucosa 
  once 
  more 
  acquires 
  its 
  normal 
  

   condition. 
  This 
  process 
  is 
  effected 
  by 
  the 
  multiplication 
  of 
  

   the 
  stroma 
  nuclei. 
  

  

  Conclusions. 
  — 
  It 
  is 
  evident, 
  from 
  the 
  foregoing 
  account, 
  

   that 
  the 
  pro-oestrous 
  process 
  in 
  the 
  ferret 
  is 
  homologous 
  with 
  

   that 
  of 
  the 
  bitch 
  (Retterer, 
  1892), 
  the 
  sheep 
  (Marshall, 
  1902), 
  

   and 
  the 
  monkey 
  (Heape, 
  1894, 
  1897). 
  In 
  severity 
  it 
  is 
  inter- 
  

   mediate 
  between 
  the 
  pro-oestrum 
  of 
  the 
  sheep 
  and 
  that 
  of 
  the 
  

   monkey, 
  while 
  it 
  differs 
  from 
  the 
  same 
  process 
  in 
  the 
  bitch 
  

   in 
  the 
  somewhat 
  greater 
  denudation 
  of 
  mucosa, 
  at 
  any 
  rate 
  

   in 
  particular 
  individuals. 
  The 
  "heat" 
  period 
  with 
  the 
  ferret, 
  

   however, 
  is 
  of 
  considerably 
  longer 
  duration 
  than 
  is 
  the 
  case 
  

   with 
  the 
  other 
  animals 
  mentioned. 
  Another 
  point 
  of 
  differ- 
  

   ence 
  from 
  the 
  sheep 
  exists 
  in 
  the 
  absence 
  of 
  pigment 
  formation 
  

   during 
  the 
  ferret's 
  metoestrum. 
  

  

  The 
  study 
  of 
  the 
  oestrous 
  cycle 
  in 
  the 
  ferret 
  shows 
  very 
  

   clearly 
  the 
  erroneousuess 
  of 
  the 
  view 
  that 
  the 
  degenerative 
  

  

  