﻿ARTICLE 
  XVII. 
  

  

  Of 
  the 
  Reaction 
  of 
  the 
  Essential 
  Oils 
  with 
  Sulphurous 
  Acid, 
  as 
  

   evolved 
  in 
  union 
  with 
  Ether 
  in 
  the 
  process 
  of 
  JEtherification, 
  or 
  other- 
  

   wise. 
  By 
  R. 
  Hare, 
  M. 
  D., 
  fyc, 
  fyc, 
  fyc. 
  

  

  Having 
  mixed 
  and 
  subjected 
  to 
  distillation 
  two 
  ounces 
  of 
  oil 
  of 
  tur- 
  

   pentine, 
  four 
  ounces 
  of 
  alcohol 
  and 
  eight 
  ounces 
  of 
  sulphuric 
  acid, 
  a 
  

   yellow 
  liquid 
  came 
  over, 
  having 
  all 
  the 
  appearance 
  of 
  that 
  which 
  is 
  

   obtained 
  in 
  the 
  process 
  for 
  making 
  oil 
  of 
  wine, 
  described 
  in 
  the 
  pre- 
  

   ceding 
  article. 
  On 
  removing, 
  by 
  means 
  of 
  ammonia, 
  the 
  sulphurous 
  

   acid 
  existing 
  in 
  the 
  liquid, 
  and 
  driving 
  off 
  the 
  ether 
  by 
  heat, 
  a 
  liquid 
  

   remained, 
  which 
  differed 
  from 
  oil 
  of 
  turpentine 
  in 
  taste 
  and 
  smell, 
  

   although 
  a 
  resemblance 
  might 
  still 
  be 
  traced. 
  This 
  liquid 
  was 
  without 
  

   any 
  sensible 
  action 
  on 
  potassium, 
  which 
  continued 
  bright 
  in 
  it 
  for 
  many 
  

   weeks. 
  It 
  proved, 
  on 
  examination, 
  to 
  contain 
  a 
  small 
  quantity 
  of 
  sul- 
  

   phuric 
  acid. 
  I 
  ascertained, 
  afterwards, 
  that 
  in 
  order 
  to 
  produce 
  these 
  

   results, 
  it 
  was 
  sufficient 
  to 
  pour 
  oil 
  of 
  turpentine 
  on 
  the 
  mass 
  which 
  

   remains 
  after 
  the 
  termination 
  of 
  the 
  ordinary 
  operation 
  for 
  obtaining 
  

   ether, 
  and 
  apply 
  heat. 
  Subsequently 
  it 
  was 
  observed 
  that 
  when 
  the 
  

   sulphurous 
  ether 
  was 
  removed 
  by 
  heat 
  or 
  evaporation, 
  without 
  the 
  use 
  

   of 
  the 
  ammonia, 
  the 
  proportion 
  of 
  sulphuric 
  acid 
  in 
  the 
  remaining 
  oil 
  

   was 
  much 
  greater. 
  

  

  By 
  subjecting 
  to 
  the 
  same 
  process 
  several 
  essential 
  oils, 
  I 
  succeeded 
  

   in 
  obtaining 
  as 
  many 
  liquids 
  to 
  which 
  the 
  above 
  remarks 
  were 
  equally 
  

   vol. 
  v. 
  — 
  4 
  p 
  

  

  