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  APPROVED 
  PROCESS 
  FOR 
  NITRIC 
  ETHER. 
  

  

  a 
  bottle 
  surrounded 
  with 
  ice 
  and 
  salt, 
  occupying 
  a 
  suitable 
  vessel 
  B 
  B. 
  

   The 
  cavity 
  of 
  the 
  receiver 
  should 
  likewise 
  be 
  occupied 
  by 
  a 
  freezing 
  

   mixture. 
  

  

  Into 
  each 
  of 
  the 
  remaining 
  tubulures 
  let 
  a 
  glass 
  tube 
  be 
  introduced, 
  

   ground 
  or 
  luted 
  to 
  fit 
  air 
  tight, 
  and 
  tapering 
  so 
  as 
  to 
  terminate 
  in 
  a 
  

   capillary 
  orifice 
  near 
  the 
  bottom 
  of 
  the 
  bottle. 
  

  

  Through 
  one 
  of 
  the 
  tubes 
  introduce 
  as 
  much 
  alcohol 
  as 
  will 
  cover 
  

   the 
  bottom 
  of 
  the 
  bottle, 
  and 
  then, 
  by 
  means 
  of 
  the 
  other 
  tube, 
  introduce 
  

   as 
  much 
  strong 
  nitric 
  acid 
  as 
  will 
  cause 
  an 
  effervescence. 
  Should 
  the 
  

   effervescence 
  threaten 
  to 
  become 
  explosive, 
  the 
  reaction 
  may 
  be 
  checked 
  

   by 
  the 
  further 
  addition 
  of 
  alcohol, 
  and 
  when 
  the 
  reaction 
  appears 
  to 
  

   decline 
  too 
  much, 
  it 
  may 
  be 
  re-excited 
  by 
  an 
  additional 
  quantity 
  of 
  

   acid. 
  By 
  these 
  means, 
  without 
  applying 
  heat, 
  a 
  quantity 
  of 
  nitric* 
  

   ether 
  will 
  soon 
  be 
  condensed 
  in 
  the 
  refrigerated 
  bottle. 
  To 
  convert 
  

   this 
  ether 
  into 
  a 
  liquid, 
  fully 
  equal 
  to 
  the 
  officinal 
  sweet 
  spirits 
  of 
  

   nitre, 
  let 
  it 
  be 
  mingled 
  with 
  seven 
  parts 
  of 
  alcohol, 
  and 
  four 
  of 
  water. 
  

  

  The 
  colder 
  the 
  freezing 
  mixture, 
  the 
  greater 
  will 
  be 
  the 
  product 
  ; 
  

   yet 
  more 
  or 
  less 
  may 
  be 
  obtained 
  by 
  refrigeration 
  with 
  cold 
  water. 
  

  

  It 
  may 
  be 
  proper 
  to 
  mention, 
  that 
  at 
  the 
  bottom 
  of 
  the 
  phial 
  an 
  

   aqueous 
  acid 
  liquor 
  is 
  deposited, 
  upon 
  which 
  the 
  ether 
  swims, 
  and 
  from 
  

   which 
  it 
  should 
  be 
  carefully 
  separated. 
  

  

  * 
  The 
  proper 
  appellation 
  of 
  this 
  ether 
  being 
  unsettled, 
  I 
  adhere 
  to 
  that 
  generally 
  used. 
  

  

  