Ordinary  ether,  agitated  first  with  2  or  3
times  its  volume  of  distilled  water,  and  a  fevi
grains  of  carbonate  of  potassa,  or  a  few  drops
of  milk  of  lime;  and  after  decantation,  again
agitated  with  a  like  quantity  of  water  only.
Used  for  inhalations.  For  other  purposes  the
washed  ether  is  afterwards  digested  on  chloride
of  calcium,  to  deprive  it  of  retained  water.
E'THERIIT.  Syn.  Camphob  op  oil  op
WINE.  A  volatile,  white,  crystalline  substance,
deposited  by  light  oil  of  wine  when  left  in  a
cold  situation  for  some  time.  It  is  isomeric
with  etherole,  and  received  its  name  from  the
assumption  of  its  being  the  base  of  the
ethereal  compounds.  According  to  this  hy-
pothesis, ether  is  a  hydrate  of  etherin.
Etherin  forme  brilliant  prisms  and  plates ;  is
tasteless ;  soluble  in  alcohol  and  ether ;  fuses
at  230'  Fahr.,  and  boils  at  500°  Fahr.  j  and  is
B  little  lighter  than  water.  The  crystals  are
purified  by  pressure  between  the  folds  of
bibulous  paper,  solution  in  ether,  and  evapora-
tion.
E'THEKOLE.  The  yellowish,  oily  liquid,
forming  the  residual  portion  of  light  oil  of
wine,  after  it  has  deposited  its  etherin.  It
is  lighter  than  water ;  is  freely  soluble  in  both
alcohol  and  ether;  and  has  a  rather  high  boil-
ing-point.   See  ExHEBiir  and  On.  OP  Wine.
ETHION'IC  ACID.  Prep.  An  alcoholic  so-
lution of  the  crystals  of  sulphate  of  carbyle  is
diluted  with  water,  the  whole  neutralised  with
carbonate  of  baryta,  the  filtered  liquid  evapo-
rated hy  a  very  gentle  heat  to  a  small  bulk,
and  a  large  quantity  of  alcohol  added;  the
precipitate  (ethionate  of  liaryta)  is  treated
(cautiously)  with  dilute  sulphuric  acid  (avoid-
ing excess),  by  which  the  baryta  is  withdrawn,
and  ethionic  acid  left  in  solution.
