disease,  we  have  no  evidence  as  to  the  geographical  or  numerical 
distribution  of  Sto'Moxys  south  of  the  Z.arnbesi.  Again,  it  is  thought 
by  most  who  have  not  studied  the  question  that  trypanosomiasis 
must  occur  in  an  epidemic  form  ;  they  do  not  appreciate  the  fact 
that  in  most  countries  where  the  disease  exists  in  the  absence  of 
Glossina,  as  for  example  in  India,  the  greatest  mortality  occurs  as  a 
result  of  isolated  cases  and  that  anything  corresponding  to  an 
epidemic  is  relatively  rare,  and  when  occurring  is  due  to  the  circum¬ 
stances  under  which  the  animals  were  kept.  Such  isolated  cases, 
where  the  disease  is  not  suspected,  and  due  to  trypanosomes  of 
diverse  animal  reactions,  are  most  readily  overlooked,  and  the  death 
would  probably  be  ascribed  to  the  commonest  complaint.  South  of 
the  Zambesi  the  name  gall-sickness  covers  a  multitude  of  diseases. 
IV.  THE  DISEASE  IN  STOCK 
We  have  met  with  the  disease  naturally  m  cattle,  sheep,  goats, 
dogs  and  a  pig  I  all  examinations  of  donkeys,  nine  in  number,  have 
been  negative. 
Concerning  the  susceptibility  of  Donkeys,  we  would  recall  that 
at  Broken  Hill  two  were  inoculated,  and  one  became  infected  with 
T.  dmiorphon.  On  December  28th,  fourteen  months  after  inocula¬ 
tion,  he  was  still  at  work,  and  had  exchanged  hands  at  an  enhanced 
price  owing  to  his  improved  condition.  The  donkey  inoculated  with 
T.  vivax  did  not  show  organisms  during  the  period  of  observation, 
and  five  months  later  he  was  taken  back  to  Chinsali  by  his  original 
owner.  We  examined  him  there  on  two  occasions  with  negative 
results,  as  also  were  those  made  on  three  other  donkeys  living  close 
to  Gl.  morsitans  and  being  worked  therein,  and  sleeping  in  a  kraal 
with  trypanosome-infected  cattle.  The  donkeys  with  which  we  came 
in  contact  apparently  possess  a  high  degree  of  resistance  to  2. 
dimorpJwn,  T.  vivax  and  a  trypanosome  allied  to  T.  nanum.  Beyond 
the  mention  of  donkeys  dying  after  the  bites  of  Haemaiapota,  a  case 
already  referred  to,  we  have  received  no  information  as  to  their 
behaviour  in  other  districts  to  which  they  may  have  been  taken. 
Trypanosomiasis  in  Cattle  would  appear  to  vary  in  intensity  very 
considerably.  The  severe  outbreaks  of  acute  disease  at  Broken  Hill 
and  Fort  Jameson  contrast  markedly  with  the  latent  infection  at 
