150  Apparatus  for  Continuous  Percolation.  {^"M^Jch'isss^"' 
1.  An  ordinary  flask,  with  a  long  narrow  neck,  and  fitted  with  a 
perforated  sound  cork,  or  india-rubber  stopper. 
2.  A  half-ounce  glass  syringe,  having  its  lower  end  stopped  by  a 
small  plug  of  cotton  wool ;  the  upper  end  is  closed  by  a  perforated 
cork,  through  which  passes  the  pointed  end  of  the  condensing  tube, 
thus  fixing  the  two  tubes  firmly  together. 
3.  A  long  glass  tube  pointed  at  one  end  and  having  a  small  hole 
made  near  the  pointed  end  to  admit  of  the  inflow  of  the  vapor  to  be 
condensed. 
4.  Another,  but  wider  glass  tube,  drawn  out  at  one  end,  so  as  to 
admit  of  a  perforated  cork,  through  which  passes  the  upper  limb  of  the 
condensing  tube.  Near  the  lower  end  of  this  tube  a  small  hole  is  made, 
into  which  is  fixed  a  narrow  glass  tube,  to  which  is  attached  a  piece  of 
india-rubber  tubing,  and  if  necessary  closed  by  a  clamp. 
The  working  of  the  apparatus  is  very  simple.  Having  placed  the 
substance  to  be  exhausted  in  the  tube  2,  the  condensing  tube  is  now 
firmly  fixed  into  position  and  the  liquid  used  for  exhausting  is  poured 
down  the  tube.  A  current  of  cold  water  is  now  allowed  to  flow  into 
tube  4,  this  being  regulated  by  means  of  the  clamp.  Heat  is  now  ap- 
plied to  the  flask,  when  the  vapor  passes  up  and  enters  tube  3,  where 
it  condenses  in  the  upper  limb  and  flows  back  into  the  percolator. — 
Phar.  Jour,  and  Trans.,  Nov.  8,  1884,  p.  363. 
At  the  evening  meeting,  held  November  5,  Mr.  Waite  showed  an 
extractor  for  continuous  percolation,  on  the  same  principle  as  Dr. 
Thresh's,  but  more  simple  in  construction.  The  apparatus  consisted 
essentially  of  a  single  tube,  of  suitable  calibre,  drawn  out  at  one  end  to 
a  point,  and  fitted  into  the  neck  of  a  wide-bottomed  flask,  so  that  the 
point  reached  within  a  short  distance  of  the  bottom  of  the  flask.  At 
the  side  of  this  tube  was  a  hole  through  which  the  vapor  from  the 
boiling  liquid  in  the  flask  rose  to  a  condenser,  so  that  the  condensed 
solvent  fell  upon  the  substance  to  be  exhausted  placed  in  the  lower 
part  of  the  tube  and  after  percolating  through  it  fell  into  the  flask, 
where  it  was  again  vaporized  and  passed  back  as  a  vapor  through  the 
aperture  above  the  mark.  Mr.  Waite  said  he  had  found  the  apparatus 
answer  very  satisfactorily. 
Anaesthesia  by  Chloral. — M.  Bouchut  gives  chloral  in  doses  of  from 
two  to  three  grams,  according  to  the  age  of  the  patient,  and  in  a  single  dose, 
and  asserts  that  it  is  a  perfect  ansesthetic,  without  any  disagreeable  result ; 
and  that  he  has  administered  it  in  this  way  in  a  large  number  of  cases. — 
Neiv  Eng.  Med.  Monthly. 
