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u-ill  detect,  from  travelling,  than  to  allow  the  whole  ten  to  go,  just 
because  the  odd  one  will  be  missed  at  the  time.  If  this  tenth  man 
were  registered  on  leaving  his  home,  and  required  to  present  himself 
for  examination  at  stated  intervals,  the  disease  would  probably  be 
diagnosed  before  sufficient  time  had  elapsed  for  him  to  become  a 
source  of  danger  in  his  new  surroundings. 
This  brings  up  the  question  of  the  registration  of  the  native 
population.  Wherever  this  is  feasible,  it  is  desirable  that  it  should 
be  done,  as  in  no  other  way  can  the  native  be  so  effectually  controlled 
and  traced.  It  is  an  important  preliminary  step  to  the  adoption  of  a 
pass  system. 
In  North-Eastern  Rhodesia,  where  the  conditions  are  perhaps 
more  favourable  than  in  those  countries  in  which  Gl.  -palpalis  is 
found  everywhere,  the  scheme  of  fighting  Sleeping  Sickness,  based  on 
the  application  of  gland  palpation  and  puncture,  is  in  full  working 
order,  and  is  apparently  being  accompanied  by  a  considerable  amount 
of  success. 
The  question  of  the  expense  depends  altogether  on  whether  the 
eventual  results  will  justify  its  incurrence.  We  believe  that  to  obtain 
the  fullest  benefit,  special  medical  officers,  who  have  some  experience 
in  the  work,  will  have' to  be  appointed,  and  of  course  this  is  rather 
costly. 
In  tropical  Africa,  the  development  of  the  country  is  dependent 
upon  a  plentiful  supply  of  native  labour,  and  in  some  parts,  at  least, 
the  greater  part  of  the  revenue  is  derived  from  the  imposition  of  hut 
taxes;  so  that  it  is  an  important  matter  that  as  great  a  percentage 
as  possible  of  the  natives  should  be  in  a  position  to  work.  It  is  certain 
that  if  the  disease  is  allowed  to  go  on  spreading,  the  development  of 
many  of  the  African  colonies  will  come  to  a  standstill,  so  that  the  cost 
of  any  measures  designed  to  check  the  advance  of  Sleeping  Sickness 
will  be  cheap  in  the  end.  This  is  a  matter  which  must  be  settled  in 
each  country,  as  it  will  depend  upon  the  area  to  be  guarded,  upon  the 
density  of  the  population,  and  upon  the  amount  of  traffic  which  is 
allowed  to  go  on. 
We  must  confess  that  from  what  we  have  seen  in  Rhodesia  we  are 
in  faiour  of  gland  palpation.  We  believe  that,  combined  with  gland 
punctuie,  it  is  a  most  useful  measure,  and  one  which  will 
lender  real  service  in  preventing  any  rapid  extension  of  the  disease 
