366 
The  morphological  appearances  in  the  first  dog  and  in  the  sub¬ 
inoculations  from  this  are  identical ;  no  ‘  long  ’  forms  were  seen  in  any 
animal. 
Diagnosis 
The  animal  reactions  of  this  trypanosome,  though  limited  in 
number,  indicate  a  degree  of  pathogenicity  not  seen  in  T.  nanum, 
while  the  absence  of  any  long  form  would  appear  to  negative 
T.  (Limorfhon  or  T.  confusum.  We  consequently  associate  this 
trypanosome  with  T.  congolense. 
The  subject  was  a  small  wire-haired  fox  terrier  ‘  Jock  ’  which 
accompanied  one  of  us  throughout  his  stay  in  the  country.  The 
history  of  this  dog  is  of  interest  as  showing  the  resistance  enjoyed 
by  some  dogs  towards  infection  by  Glossina. 
He  was  in  contact  with  Glossina  morsitans  or  Glossina  pal  falls 
almost  daily  from  September,  190;,  to  February,  1908,  and  again 
from  April  to  the  end  of  May,  and  during  the  last  week  in  August, 
1908.  In  March,  1908,  he  became  weak  and  listless,  with  pallid 
membranes  and  a  temperature  up  to  103°,  but  no  trypanosomes  could 
be  demonstrated,  and  a  rapid  recovery  was  made.  From  the  middle 
of  October  he  again  manifested  signs  of  illness,  commencing  here 
with  marked  oedema  of  both  ears ;  a  few'  days  later  he  had  a 
temperature  of  102°,  rapid  respirations,  nose  dry  and  warm,  and 
visible  membranes  pallid.  Trypanosomes  were  first  seen  on  October 
31st,  and  on  only  three  other  occasions  during  the  next  fortnight  of 
daily  examinations.  He  appeared  to  improve  from  November  24th, 
and  no  trypanosomes  were  seen  after  November  12th.  He  was  left  at 
Pretoria  apparently  improved,  but  Dr.  Theiler  tells  us  he  rapidly  went 
off  and  died,  showing  many  trypanosomes  shortly  after  our  departure, 
A  dog  (No.  9)  was  inoculated  on  October  31st  with  six  drops  of  blood  from 
‘Jock.’  The  temperature  became  irregular  from  the  eighth  day,  but  no  trypano¬ 
somes  were  seen  in  the  blood  until  November  21st:  they  were  present  in  the 
glands  from  the  tenth  day  following  inoculation.  Trypanosomes  remained  present, 
but  always  scanty  (one  or  two  to  a  cover-glass,  rarely  one  in  ten  fields),  up  to 
death  on  November  27th. 
Dog  No.  16  was  inoculated  subcutaneously  on  November  27th  with 
heart  blood  of  Dog  9.  Trypanosomes  were  never  seen  in  the  blood  of  this  animal 
up  to  its  arrival  in  Pretoria  ;  but  gland  puncture  on  December  20th  showed 
infection  to  have  resulted. 
