Its  colour,  the  existence  of  patolies  of  blood-clot  imbedded  in  it,  and  all
its  other  characters,  satisfactorily  proved  that  it  had  been  a  thin  clot  of
blood, — an  example  of  such  as  are  eflFused  in  apoplexy  of  the  cerebral
membranes.  Numerous  small  vessels  could  be  seen  passing  from  the
dura  mater  into  this  clot-membrane ;  and  with  the  microscope,  while
they  were  still  fuU  of  blood,  I  made  the  sketch  engraved  (Kg  16,  a).
The  arrangement  of  the  bloodvessels  bears  a  close  resemblance,  but,
perhaps,  more  ia  its  irregularity  than  in  any  positive  characters  or  plan,
to  that  which  exists  in  false  membrane  formed  in  inflammation  of  a
serous  membrane ;  but  the  vessels  were,  I  think,  generally  larger.
Fig.  16.
Such  were  the  bloodvessels  of  this  organised  clot.  Its  minute  struc-
ture, as  represented  above  (b),  showed  characters  which  are  of  peculiar
interest,  because  of  their  resemblance  to  those  observed  in  the  material
that  is  commonly  formed  in  the  repair  of  subcutaneous  injuries.  In  the
substance  of  what  else  appeared  like  a  filamentous  clot  of  fibrine,
sprinkled  over  with  minute  molecules,  the  addition  of  acetic  acid  brought
into  view  corpuscles,  very  elongated,  attenuated,  and,  in  some  instance.",
like  short  strips  of  flat  fibre.  Of  course,  such  corpuscles  are  not  to  be
found  in  any  ordinary  clot  of  fibrine  ;  they  exactly  resemble  such  as
may  be  found  in  certain  examples  of  rudimental  connective  tissue,  and,
among  these,  in  the  material  for  the  repair  of  subcutaneous  injuries.
