3^8 
ON  THE  PROPEKTIES  OF  LIQUID  CARBONIC  ACID. 
moves  the  last  traces  of  chlorine.  The  solution  obtained  marks 
29°  to  32^^  B.,  and  is  brought  to  the  officinal  strength  (30^ 
Baume)  by  evaporation  or  dilution,  as  the  case  may  require. 
The  perchloride  of  iron  obtained  by  this  process  is  chemically 
neutral,  as  the  following  analysis  proved,  and  the  solution  after 
being  kept  a  long  time  had  not  undergone  the  least  alteration, 
whilst  the  perchloride  made  by  other  processes  had  changed 
soon  after  its  preparation. 
The  normal  solution  of  perchloride  of  iron,  chemically  neu- 
tral, is  perfectly  limpid  without  its  having  been  filtered  ;  it  yields 
no  ochreous  deposit  on  standing,  and  its  color  is  saffron  yellow. 
It  produces  an  excessive  astringence  without  the  acidity  ob- 
served in  all  other  solutions  of  perchloride  of  iron.  At  30^ 
Baume  it  contains,  in  100  parts,  water  71,  anhydrous  perchlo- 
ride of  iron  26  parts. 
The  mean  of  three  analyses  of  this  normal  solution  was 
Chlorine,  16-989  16-959 
Iron,         8-960  8-976 
These  results  show  the  chemical  neutrality  of  the  product  of 
the  above  formula." — Repertoire  de  Phay^macie,  Jan.,  1861. 
Oxide  of  iron,  12-80 
ON  THE  PROPERTIES  OF  LIQUID  CARBONIC  ACID. 
By  George  Gore,  Esq. 
In  this  communication  the  author  shows  how  a  small  quantity 
of  liquid  carbonic  acid  may  be  readily  and  safely  prepared  in 
glass  tubes  closed  by  stoppers  of  gutta  percha,  and  be  brought 
in  a  pure  state  into  contact  with  any  solid  substance  upon  which 
it  may  be  desired  to  ascertain  its  chemical  or  solvent  action,  or 
be  submitted  to  the  action  of  electricity  by  means  of  wires  in- 
troduced through  the  stoppers. 
By  immersing  about  fifty  substances  in  the  liquid  acid  for 
various  periods  of  time,  he  has  found  that  it  is  comparatively  a 
chemically  inert  substance,  and  not  deoxidised  by  any  ordinary 
deoxidising  agent  except  the  alkali  metals.  Its  solvent  power 
is  extremely  limited.  It  dissolves  camphor  freely,  iodine 
sparingly,  and  a  few  other  bodies  in  small  quantities.  It  does 
not  dissolve  oxygen  salts,  and  it  does  not  redden  solid  extract  of 
