68 
present,  so  that  no  conclusion  as  to  presence  or  absence  of 
haemolysin  in  the  patient’s  blood  can  be  drawn.  It  may  here  be 
observed  that  the  growth  of  bacteria  in  oxalated  plasma  is  not 
necessarily  attended  with  haemolysis  of  red  cells  contained  in  the 
plasma  ;  in  contaminated  plasma  haemolysis  is  sometimes  observed, 
but  is  not  Linfrequently  absent.  The  third  case  (25,  Table  30)  occurred 
with  a  malarial  patient’s  blood.  Haemolysis  was  slight,  and  next 
day,  on  repeating  the  observation,  no  haemolysis  was  obtained. 
The  blood  plasma  of  two  oxen  suffering  from  Texas  fever  was 
examined,  on  the  day  before  death,  during  the  passage  of  redwater. 
No  autolysin  was  present  in  either  case. 
The  blood  plasma  of  two  dogs  suffering  from  piroplasmosis,  both 
passing  urine  free  from  haemoglobin,  was  also  examined.  In  each 
case  no  autolysin  was  found. 
SUMMARY 
The  haemoglobinuria  of  blackwater  fever  is  not  dependent  upon 
haemolysinaemia. 
