Am.  Jour.  Pharm.\ 
May.lS94.  j" 
Calomel  in  Japan, 
237 
of  firing.  In  Fig.  3  the  mounting  of  the  pots  is  shown  in  three 
stages  by  sectional  plans  of  the  table. 
On  a  smoothed  clay  hearth  the  walls  of  the  furnace  are  raised  in 
clay,  building  in  the  three  stones  which  frame  the  stoke-hole  (Fig.  3), 
The  walls  are  2  6  feet  high  and  the  enclosure  is  7-6  feet  by  47  feet, 
measured  outside.  The  stoke-hole  is  1  foot  by  1  foot,  but  a  little 
wider  than  this  at  the  base,  and  is  without  door.  The  table  of  pots 
and  roof  of  the  furnace  is  constructed  {Figs.  1  and  3)  by  laying  a 
square  iron  rod  on  each  of  the  long  walls,  and  on  these  1 1  cross 
rods,  also  square,  on  which  are  to  rest  the  flanges  of  the  pots.  The 
pots  are  then  put  in  position  as  close  together  as  possible,  hanging 
Fig.  i. 
by  their  flanges,  in  10  rows  of  six  each,  and  plastic  clay  pressed  into 
the  openings  left  between  the  flanges  and  the  roots,  and  the  roots 
and  flanges  covered  in  so  that  only  the  mouths  of  the  pots  remain 
visible,  as  shown  by  the  middle  rows  in  Fig.  3.  The  furnace  clay 
being  thoroughly  dry,  it  is  deeply  laid  over  with  the  red  earth  mixed 
with  a  little  bay-salt  and  moistened  with  bittern  in  small  quantity. 
The  pots  are  also  filled  with  the  same  moist  red  earth,  except  in  a 
central  cylindrical  shaft  (see  the  left  side  of  the  furnace-table  in  Fig. 
1  or  th.e  right  side  in  Fig.  3),  reaching  to  the  bottom  of  the  pot 
which  is  left  bare.  The  pot  is  0  5  feet  deep  inside,  and  across  its 
mouth,  inside,  is  0-45  feet.  It  is  shown  in  Fig.  4..  The  shaft  or 
cavity  left  in  the  filling  is  0-18  feet  in  diameter,  and  is  shaped  by 
resting  a  wooden  core  on  the  bottom  of  the  empty  pot,  and  then 
