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area  are  allowed  to  leave  therr  distncts.  This  scheme  acts  not  only  as 
a  bar  to  the  possible  escape  of  cases  of  trypanosomiasis  to  the  south 
but  will  also  control  to  a  large  degree  the  spread  of  other  communi¬ 
cable  diseases  and  prevent  the  employment  of  physically  unfit 
labourers.  The  scheme  is  completed  by  the  Southern  Rhodesian 
Government  requiring  all  labourers  to  be  registered,  and  the 
employment  of  unregistered  natives  being  made  an  offence 
