II4 
The  renal  plugs  were  seen  in  sections  stained  with  haematoxylin 
to  be  very  irregular  and  heterogeneous  in  aspect,  not  as  a  rule  , 
completely  filling  the  lumen  of  the  tubule.  They  were  in  part  made  I 
up  of  granules,  readily  taking  up  the  dye  so  as  to  be  black  in  colour,  | 
and  of  irregular  masses,  measuring,  as  much  as  50/1  or  more  across, 
formed  by  the  coalescence  of  the  granules.  In  addition  to  these  j 
granules  other  elements  were  often  present,  namely,  detached  | 
epithelial  cells  and  smaller  lightly  stained  granules,  together  with 
flocculent  matter. 
Fig.  39.  Section  of  cortex  of  kidney  during  suppression  of  urine,  five 
days  after  haemoglobinuria  had  ceased.  Blackwater  Fever,  Case  ii.  J 
A  dilated  renal  tubule  is  seen  in  transverse  section.  The  lumen  of  I 
the  tubule  is  partly  occupied  by  darkly  stained  granules,  varying  in  F 
diameter  from  3/x  to  about  5/i,  which  have  joined  together  so  as  to  | 
form  irregular  more  or  less  elongated  masses.  In  addition  one  free  1 
epithelial  cell  is  seen  among  the  granular  masses.  The  epithelial  L 
lining  of  the  tubule  can  be  recognised  without  difficulty,  it  is  thinned,  J 
especially  above.  F.xcept  for  this  thinning,  the  result  of  dilation  of  I 
the  tubule,  the  epithelium  does  not  seem  otherwise  altered.  Hardened  j 
in  alcohol.  Stained  with  iron  alum  haematoxylin.  x  1300.  I 
