*  the  skilful  hand

Breezes  prepared,  iunocuouB  and  bland.'

But  this  was  not  all.  In  order  to  dilute  this  medicated  air  it  was
obviously  necessary  to  make  use  of  a  portion  at  least  of  the  air  of
the  country;  but  the  Doctor  had  provided  a  remedy  even  for
this  inconvenience — the  ships  were  provided  with  apparatus  for
Jiltering  the  African  atmosphere,  as  a  cook  strains  calf's-foot
jelly  :—

'The  medicator  was  arranged  as  follows: — The  windsails  were
hoisted,  and  attached  to  the  lower  lateral  openings,  which  were  covered
with  fine  bunting  [a  kind  of  worsted  gauze,  such  as  flags  are  made  of].
KfiUer  of  the  same  material  was  stretched  across  the  upper  tier,  which
is  usually  occupied  by  trays.  Thus  the  air  underwent  filtration  before
it  came  in  contact  with  the  substances  in  the  trays,  and  after  it  had
been  subjected  to  their  action,  chlorine  was  evolved  from  the  lower
compartment  of  the  medicator,  by  disengaging  it  from  the  chloride  of
lime  by  means  of  sulphuric  acid.' — p.  411.
