PHARMACEUTICAL  STILL. 
199 
Stove-pot,  or  any  other  vessel  of  suitable  dimensions  will 
answer.  The  still  may  be  very  cheaply  made  from  tin-plate, 
or  more  durably  from  tinned  copper.  Care  should  be  taken  to 
turn  the  solder-joint  of  the  tube  (m)  (n)  upward. 
In  this  apparatus  the  combination  of  a  Liebig's  condenser 
with  a  partial  refrigerator  enables  the  operator  to  separate 
strong  alcohol  at  once  from  dilute  tinctures,  or  alcohol  from 
ether,  by  the  mere  regulation  of  the  temperature  of  the  water 
in  the  vessel  (b),  which,  when  maintained  just  above  the  boiling 
