274 
With  tin--'  e\cri)tion  of  tlie  distrilntliDn  of  tsetse  Hies,  innst  of 
onr  information  is  lirst-haiul,  as  until  Europeans  st.irted  to  scarrli  for 
cases  of  .Sl('e|tln}^  Sickness,  the  natives  were  in  entire  ip^noraiu'e  of 
the'  disease,  ;nul  even  yet  have  not  grasped  the  danger  whicli  attaches 
111  it.  In  many  parts  of  the  country  they  denied  the  presence  of 
tsetse  Hies,  although  these  were  caught  within  the  village. 
I'ur  iiistimco,  at  Kutuliisliia's,  on  llu'  rivci'  Itif  siviit  lliiit  llicif 
wiTO  no  tsetse  Ilie.s  (tnseinbe)  in  tlio  iieiKliliotirluiotl.  't'lnee  spoi-imcns  ot 
morsitons  were  r.auglit  in  the  village. 
,\t  Komlia's  village,  on  I, alto  Tanganyika,  we  were  Inld  lInU  there  were  no 
tsetse  hies.  (It.  flit /'ll  tis  was  fairly  ahutulant  along  llic  lake  shore. 
This  was  due,  in  all  probability,  lo  the  fad  lliat  they  did  not 
possess  any  live  stock,  for  in  those  distriets  where  domestie  .animals 
were  fottnd,  the  owners  knew  tlie  Hies  tind  the  disease  which  they 
produced. 
11.  PHYSICAL  CHARACTERS  OF  THE  COUNTRY 
The  general  consensus  of  ojtinion  is  that  (Hossinn  pa/f>a/is  does 
not  exist  at  elevations  above  four  thousand  feet,  and  although  nutton 
and  TockP  mention  an  histance  in  which  they  were  found  above  this 
height,  reported  on  the  authority  of  an  olTicer  in  the  Clongo  h'ree  State 
service,  confirmatory  observations  are  lacking.  In  view  of  tliis,  it  is 
of  some  interest  to  lake  notice  ol  the  pliysical  gecjgraphy  of  Norlh- 
EasLern  lihodcsia  and  Nyasaland,  since  Lhe  greater  part  of  these  two 
countries  is  formed  of  high  iilatcau  ground.  .Speaking  broarily, 
North-Eastern  Rhodesia  may  be  described  as  cum|iosing  a  part  of 
the  watershed,  running  diagonally  south  and  west,  which  separates  the 
Eongo  and  Zambesi  systems,  and  which,  for  the  most  part,  reaches 
an  elevation  of  from  four  to  over  five  thousand  feet  above  sea  level. 
It  is  split  up  into  more  or  less  parallel  sections  by  the  Euainila, 
Chambesi  and  I.uangwa  rivers,  anti  in  many  [ilaces  the  fall  from  lhe 
plateau  to  lhe.se  river  valleys  is  very  abrupt,  as,  for  example,  on  the 
west  side  of  the  Luangwa  where  the  Machinga  escarpment  rises  very 
acutely  some  two  thousand  feet  This  abrupt  fall  is  parliciikniy 
*  Dutton  and  Todd,  1907.  Annals  Tropical  Medicine  and  I’arasitology , 
Vol.  I.  No.  I. 
Martin  (Les  trypanosomes  do  le  Gnindc  francaise,  1906,  A.  Maloine,  Paris) 
mcnlioiiB  lliiit  lie  caiiglil  a  single  specimen  of  Ct.  /nl/alis  at  an  elevation  of 
1,000  nietre.s. 
