238 
Calomel  in  Japan. 
/Am.  Jour.  Pharm 
t        May,  1894. 
pressing  in  the  moist  earth  round  it,  smoothing  off  the  top,  and 
dropping  a  perforated  board  over  the  projecting  core  to  hold  down 
the  earth  while  withdrawing  the  core,  which  is  then  removed  by  its 
handle.    The  furnace  is  now  ready  for  work.    It  should  have  been 
Fig.  2. 
mentioned  that  after  the  clay  walls  of  the  furnace  are  built  they  are 
framed  in  with  wood  to  increase  their  stability  and  to  give  support 
to  a  wooden  back  and  to  shelving  above  the  table,  as  seen  in  Fig.  i. 
Of  the  Firing. — The  firing  the  pots  is  kept  far  below  what  are 
V  /  / 
Fig.  3. 
usually  regarded  as  furnace  heats.  The  fuel  employed  is  wood,  and 
the  Japanese  are  clever  in  the  use  of  this  economically  and  effectively 
in  firing  pots  for  boiling,  evaporating,  distilling  or  subliming.  The 
method  of  heating  is  seen  in  Fig.  2.    Five  lengths  of  firewood  are 
