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Rigorous  rules  cannot  be  laid  down  for  the  nomenclature  of 
trypanosomes ;  but,  in  general,  it  may  be  admitted  that  T.  nanum  is 
short  and  tadpole-like,  from  10  to  14  /^,  and  is  relatively  innocuous 
to  laboratory  animals.  A  strain  virulent  to  all  would  cease  to  be 
T.  nanmn.  It  is  therefore  to  be  hoped  that  more  details  of  the 
strain  with  which  Balfour  infected  gerbils,  and  Wenyon  infected  dogs 
from  which  a  gerbil  was  successfully  inoculated,  will  be  published. 
They  were  derived  from  different  sources,  a  mule  at  Wau  and  a  heifer 
at  Sobat ;  but  we  do  not  know  whether  it  is  from  the  same  animals 
that  the  fourteen  out  of  fifteen  rats  were  inoculated  without  result.* 
We  write  with  the  sole  idea  of  analysing  the  present  references  to 
T  nanum,  and  to  point  out  that  it  is  with  the  original  descriptions  of 
this  species  that  we  associate  the  ‘  Scotsdale  ’  trypanosome,  and  that 
we  have  noted  the  same  morphological  variations  as  has  Wenyon. 
It  will,  however,  be  necessary  to  verify  the  reaction  in  the  rabbit  at 
Pretoria  as  being  due  to  the  uncontaminated  original  strain,  and  to 
show  that  it  is  there  still  relatively  innocuous  to  laboratory  animals 
before  accepting  that  the  strain  Sheep  4  is  that  with  which  the  above 
experiments  were  carried  out. 
2.  Kambole  Strains 
Kambole  is  the  name  of  a  Mission  Station  situated  on  the  high 
land  above  Lake  Tanganyika  and  the  Lovu  River,  and  some  fifty 
miles  West  of  Abercorn.  It  was  selected  as  suitable  locality  for  an 
experimental  camp  owing  to  the  fact  that  both  Gl.  pal  falls  and 
Gl.  morsitans  could  be  caught  within  a  few  miles.  One  of  us  arrived 
there  early  in  August,  the  other  during  the  third  week  in  September. 
Until  our  sudden  departure  for  Europe  on  November  15th,  we  had 
an  opportunity  of  studying  the  trypanosomes  in  the  mission  cattle 
and  of  comparing  them  with  the  other  strains  we  had  accumulated. 
Only  elementary  diagnostic  work  was  possible,  owing  to  the  great 
scarcity  of  small  animals :  our  object  was  rather  to  maintain  the 
strains  so  that  they  could  be  brought  home,  and  at  the  same  time 
arrive  at  some  idea  as  to  the  nature  of  the  trypanosomes  encountered 
*  Dr  Wenvon  has  kindly  given  us  some  unpublished  particulars  of  his  wor 
on  th£  try^Some.  They ^in^hcate, forcibly  that  wHle^ra.  are 
Ssef  a  3Tp°ec-est  dogT^nd^^mbils  may  readily  take  infection, 
cases  these  animals  were  inoculated  from  the  same  infected  bea  . 
