301 
It  was  an  everyday  occurrence  to  have  carriers  come  up  complaining  of  ‘  mutu,' 
or  headache,  and  this  could  almost  always  be  relieved  by  a  dose  of  some  purgative. 
No  loss  of  strength,  emaciation,  skin  eruptions,  tremors  or  mental 
disturbances  were  noticeable.  In  the  two  clinical  cases,  tremors, 
emaciation,  and  inability  to  walk  were  the  principal  symptoms  present. 
We  never  saw  a  case  sufficiently  advanced  to  show  mental  symptoms 
or  coma. 
Insanity  is  said  to  be  a  common  early  symptom  of  the  disease,  but 
in  two  cases  which  we  saw,  and  on  which  we  performed  lumbar 
puncture,  no  parasites  were  found  in  the  cerebro-spinal  fluid. 
VIII.  MODE  OF  INTRODUCTION 
We  have  stated  m  our  previous  report  that  some  of  the  cases  on 
the  Luapula  river  have  apparently  brought  the  disease  into  Rhodesia 
by  way  of  the  Katanga.  The  foci  on  Lakes  Mweru  and  Tanganyika 
are  due  to  direct  extension  from  the  immediately  contiguous  infected 
areas  in  the  Congo  Free  State.  On  the  Mweru  side,  the  disease  has 
been  gradually  spreading  up-stream  from  the  Congo,  along  the 
Lualaba,  until  it  reached  Lake  Mweru  probably  four  or  five  years  ago. 
In  the  Congo  Free  State,  on  Lake  Tanganyika,  imported  cases 
existed  at  Moliro,  just  over  the  international  boundary,  in  1901  ;  at 
Baudoinville  in  1902;  and  at  Vua,  between  these  two  places,  about 
the  same  time.  Within  the  last  two  or  three  years  such  a  large  per¬ 
centage  of  the  native  population,  along  this  portion  of  the  lake,  has 
died  from  Sleeping  Sickness  that  the  White  Fathers  have  been 
compelled  to  abandon  their  missions. 
On  both  lakes,  the  tribal  and  political  boundaries  do  not  coincide, 
and  on  both,  the  paramount  chiefs  (Mpweto  and  Moliro)  live  in 
Belgian  territory.  There  has  always  been  constant  communication 
between  the  people  on  either  side  of  the  line,  and  to  this  the  introduc¬ 
tion  of  the  disease  into  Rhodesia  has  been  due.  In  eliciting  the 
past  history  of  our  cases  it  was  extremely  common  to  find  that  a 
native  had  been  born  in  a  village  on  the  British  side,  had  then  been 
taken  as  a  child  into  the  Congo,  had  afterwards  returned  to  our 
territory,  and  finally  settled  down  in  a  fourth  village.  The  same  may 
be  said  of  the  villagers  on  the  eastern  side  of  Lake  Tanganyika, 
except  that  here  the  movement  was  into  German  East  Africa.  On 
