﻿ENTOMOLOGICAL 
  ASPECTS 
  OF 
  AN 
  OUTBREAK 
  OF 
  SLEEPING 
  SICKNESS. 
  355 
  

  

  2. 
  The 
  Protection 
  of 
  People 
  who 
  must 
  pass 
  through 
  the 
  Bush. 
  

  

  Here 
  it 
  was 
  a 
  question 
  of 
  the 
  minimum 
  width 
  of 
  clearing. 
  In 
  order 
  to 
  safeguard 
  

   the 
  travelling 
  population 
  adequately, 
  while 
  exposing 
  for 
  as 
  short 
  a 
  time 
  as 
  possible 
  

   the 
  large 
  number 
  of 
  natives 
  who 
  would 
  be 
  engaged 
  in 
  making 
  the 
  clearings, 
  it 
  was 
  

   urgent 
  to 
  find 
  this 
  out. 
  It 
  was 
  particularly 
  important 
  in 
  relation 
  to 
  a 
  fly 
  that 
  had 
  

   already 
  shown 
  itself 
  to 
  possess 
  habits 
  of 
  movement 
  that 
  had 
  been 
  recorded 
  hitherto 
  

   for 
  no 
  other 
  tsetse. 
  

  

  While 
  for 
  the 
  reason 
  I 
  have 
  stated 
  (p. 
  334) 
  I 
  had 
  to 
  leave 
  the 
  completion 
  of 
  my 
  

   experiment 
  at 
  Zagayu 
  to 
  Dr. 
  Maclean 
  and 
  Mr. 
  Tully, 
  I 
  was 
  not 
  prepared 
  to 
  recommend 
  

   a 
  clearing 
  of 
  less 
  than 
  150 
  yards 
  on 
  each 
  side 
  of 
  the 
  road, 
  and 
  I 
  think 
  that 
  when 
  the 
  

   grass 
  is 
  short 
  more 
  will 
  be 
  required 
  for 
  complete 
  protection. 
  But 
  it 
  will 
  be 
  well 
  to 
  

   push 
  through 
  a 
  somewhat 
  narrower 
  clearing 
  in 
  the 
  first 
  place 
  in 
  order 
  the 
  more 
  

   rapidly 
  to 
  confer 
  some 
  measure 
  of 
  protection 
  on 
  travellers. 
  

  

  Fords 
  especially 
  and 
  other 
  halting-places 
  should 
  be 
  cleared, 
  at 
  the 
  very 
  least, 
  

   to 
  twice 
  or 
  three 
  times 
  this 
  width, 
  as 
  it 
  is 
  here 
  that 
  natives 
  halt 
  long 
  enough 
  for 
  

   belated 
  flies 
  to 
  come 
  dribbling 
  in 
  (p. 
  336) 
  and 
  that, 
  with 
  bush 
  present, 
  the 
  flies 
  leave 
  

   their 
  carriers 
  and 
  form 
  dangerous 
  concentrations. 
  Also 
  the 
  natives 
  themselves 
  at 
  

   such 
  places 
  move 
  about 
  in 
  search 
  of 
  wood, 
  and 
  the 
  smaller 
  the 
  clearing 
  the 
  greater 
  

   the 
  number 
  of 
  flies 
  they 
  will 
  bring 
  back 
  to 
  the 
  shelters. 
  The 
  scattered 
  bushes 
  and 
  

   trees 
  round 
  water-holes 
  that 
  have 
  no 
  effect 
  on 
  the 
  conservation 
  of 
  the 
  water 
  should 
  

   be 
  cleared 
  also. 
  

  

  Whatever 
  clearing 
  is 
  made 
  it 
  should 
  be 
  thorough. 
  All 
  trees 
  should 
  be 
  cut, 
  and 
  

   they 
  should 
  be 
  cut 
  near 
  the 
  ground, 
  at 
  once 
  chopped 
  up 
  and 
  piled 
  on 
  the 
  stump. 
  

   When 
  dry 
  (in 
  three 
  or 
  four 
  weeks 
  in 
  the 
  dty 
  season) 
  they 
  should 
  be 
  burned 
  and 
  the 
  

   remnants 
  repiled 
  and 
  burned 
  out 
  finally. 
  This 
  kills 
  many 
  of 
  the 
  stumps, 
  and 
  may 
  

   help 
  to 
  some 
  extent 
  to 
  prevent 
  that 
  dense 
  regrowth 
  which 
  in 
  two 
  or 
  three 
  years 
  

   becomes 
  more 
  acceptable 
  to 
  tsetse 
  than 
  the 
  uncleared 
  bush 
  and 
  which 
  must 
  at 
  all 
  

   costs 
  be 
  prevented. 
  

  

  3. 
  The 
  Prevention 
  of 
  the 
  Passage 
  of 
  Infected 
  Persons 
  to 
  uninfected 
  Tsetse 
  Areas. 
  

  

  In 
  the 
  German 
  agreement 
  with 
  the 
  Territory's 
  northern 
  neighbours 
  it 
  was 
  arranged 
  : 
  

   (a) 
  to 
  take 
  such 
  steps 
  as 
  might 
  be 
  practicable 
  to 
  prevent 
  natives 
  of 
  the 
  respective 
  

   territories 
  who 
  are 
  suspected 
  of 
  being 
  infected 
  from 
  crossing 
  the 
  border 
  ; 
  (b) 
  to 
  detain 
  

   or 
  segregate 
  natives 
  coming 
  in 
  and 
  found 
  to 
  be 
  infected 
  ; 
  (c) 
  to 
  prevent 
  natives 
  from 
  

   crossing 
  into 
  areas 
  declared 
  infected 
  ; 
  (d) 
  to 
  lose 
  no 
  time 
  in 
  notifying 
  infected 
  areas 
  ; 
  

   (e) 
  to 
  establish 
  segregation 
  camps 
  at 
  adjacent 
  points 
  on 
  either 
  side. 
  

  

  This 
  is 
  purely 
  an 
  administrative 
  and 
  medical 
  problem 
  and 
  I 
  will 
  not 
  discuss 
  it 
  

   here. 
  The 
  dangers 
  and 
  difficulties 
  have 
  been 
  indicated 
  in 
  Section 
  XX, 
  and, 
  in 
  

   the 
  map, 
  I 
  have 
  thought 
  it 
  interesting 
  to 
  show 
  (over 
  a 
  small 
  patch 
  only) 
  some 
  of 
  the 
  

   native 
  paths 
  to 
  illustrate 
  further 
  the 
  difficulty 
  of 
  preventing 
  natives 
  from 
  crossing 
  

   the 
  border 
  or 
  of 
  otherwise 
  controlling 
  their 
  movements. 
  

  

  4. 
  Clearing 
  round 
  Villages. 
  

  

  The 
  measures 
  alreadv 
  enumerated, 
  and 
  particularly 
  the 
  effective 
  segregation 
  

   and 
  treatment 
  of 
  the 
  sick, 
  constitute 
  fairly 
  full 
  prophylaxis 
  in 
  themselves. 
  An 
  

   additional 
  measure 
  that 
  seemed 
  to 
  us 
  advisable 
  — 
  and 
  Maclean 
  was 
  specially 
  anxious 
  for 
  

   it 
  — 
  was 
  the 
  clearing 
  of 
  the 
  bush 
  round 
  all 
  villages 
  and 
  gardens 
  in 
  the 
  areas 
  surrounding 
  

   the 
  evacuated 
  country. 
  This 
  would 
  comprise 
  the 
  villages 
  most 
  likely 
  to 
  contain 
  

   undetected 
  infection 
  and 
  most 
  likely 
  to 
  be 
  visited 
  with 
  any 
  frequency 
  by 
  infected 
  

   people, 
  and 
  though 
  the 
  measure 
  would 
  not 
  free 
  the 
  villages 
  completely 
  of 
  tsetse, 
  it 
  

   would 
  at 
  any 
  rate 
  prevent 
  the 
  very 
  wholesale 
  infestation 
  I 
  have 
  described 
  and 
  to 
  

   that 
  extent 
  lessen 
  the 
  chances 
  of 
  infection. 
  

  

  