﻿350 
  dr 
  Anderson's 
  researches 
  on 
  some 
  of 
  the 
  

  

  tinctly 
  basic, 
  the 
  whole 
  of 
  the 
  resin 
  and 
  narcotine 
  are 
  precipitated, 
  while 
  the 
  the- 
  

   baine 
  remains 
  in 
  the 
  solution. 
  The 
  fluid 
  is 
  filtered 
  from 
  the 
  precipitate, 
  and 
  the 
  

   excess 
  of 
  lead 
  thrown 
  down 
  by 
  means 
  of 
  sulphuric 
  acid, 
  the 
  sulphate 
  of 
  lead 
  

   separated 
  by 
  filtration, 
  and 
  ammonia 
  added, 
  when 
  there 
  is 
  immediately 
  obtained 
  

   a 
  more 
  or 
  less 
  brown 
  precipitate 
  of 
  thebaine, 
  which 
  is 
  collected 
  on 
  a 
  filter, 
  washed, 
  

   dried, 
  and 
  dissolved 
  in 
  boiling 
  alcohol. 
  The 
  solution, 
  which 
  is 
  generally 
  very 
  

   dark-coloured, 
  becomes 
  filled, 
  on 
  cooling, 
  with 
  flattened 
  crystals 
  of 
  thebaine. 
  

   The 
  mother 
  liquor 
  is 
  separated 
  by 
  expression, 
  and 
  the 
  crystals, 
  after 
  boiling 
  with 
  

   animal 
  charcoal 
  and 
  several 
  crystallisations 
  from 
  boiling 
  spirit, 
  constitute 
  pure 
  

   thebaine. 
  

  

  The 
  mother 
  liquor 
  of 
  the 
  original 
  ammonia 
  precipitate, 
  as 
  has 
  been 
  already 
  

   mentioned, 
  contains 
  narceine, 
  for 
  the 
  separation 
  of 
  which 
  I 
  have 
  found 
  it 
  most 
  

   convenient 
  to 
  proceed 
  in 
  the 
  following 
  manner. 
  A 
  solution 
  of 
  acetate 
  of 
  lead 
  is 
  

   added 
  to 
  the 
  fluid, 
  and 
  the 
  dirty 
  brownish 
  precipitate 
  which 
  appears 
  is 
  separated 
  

   by 
  filtration 
  through 
  cloth. 
  The 
  excess 
  of 
  lead 
  is 
  removed 
  by 
  means 
  of 
  sulphuric 
  

   acid, 
  and 
  the 
  fluid 
  filtered 
  from 
  the 
  sulphate 
  of 
  lead, 
  after 
  being 
  saturated 
  with 
  

   ammonia, 
  is 
  set 
  to 
  evaporate 
  on 
  the 
  sand-bath 
  at 
  a 
  moderate 
  temperature. 
  If 
  

   the 
  operation 
  has 
  been 
  properly 
  conducted, 
  a 
  film 
  appears 
  on 
  the 
  surface 
  at 
  a 
  

   certain 
  degree 
  of 
  concentration, 
  and 
  on 
  cooling, 
  a 
  quantity 
  of 
  a 
  crystalline 
  matter 
  

   is 
  deposited 
  in 
  the 
  thick 
  brown 
  mother 
  liquor, 
  which 
  increases 
  somewhat 
  on 
  

   being 
  allowed 
  to 
  stand 
  for 
  some 
  days. 
  When 
  this 
  substance 
  is 
  collected 
  on 
  a 
  cloth, 
  

   and 
  washed 
  with 
  a 
  small 
  quantity 
  of 
  water, 
  it 
  is 
  sometimes 
  obtained 
  perfectly 
  

   colourless 
  at 
  once, 
  but 
  more 
  generally 
  has 
  a 
  brownish 
  colour. 
  By 
  farther 
  evapo- 
  

   ration 
  of 
  the 
  mother 
  liquor 
  an 
  additional 
  quantity 
  of 
  crystals 
  is 
  obtained. 
  The 
  

   crystals 
  are 
  then 
  boiled 
  with 
  a 
  large 
  quantity 
  of 
  water, 
  and 
  the 
  solution, 
  filtered 
  

   hot, 
  becomes 
  filled 
  on 
  cooling 
  with 
  fine 
  silky 
  needles 
  of 
  narceine, 
  while 
  a 
  large 
  

   quantity 
  of 
  sulphate 
  of 
  lime 
  and 
  other 
  impurities 
  remain 
  on 
  the 
  filter. 
  The 
  crys- 
  

   tals 
  of 
  narceine 
  have 
  generally 
  a 
  slight 
  shade 
  of 
  colour, 
  and 
  retain 
  traces 
  of 
  sul- 
  

   phate 
  of 
  lime, 
  from 
  which 
  they 
  are 
  purified 
  by 
  solution 
  in 
  alcohol, 
  boiling 
  with 
  

   animal 
  charcoal, 
  and 
  again 
  crystallising 
  from 
  water. 
  

  

  II. 
  Narceine. 
  

  

  Narceine 
  was 
  discovered 
  by 
  Pelletier,* 
  about 
  the 
  year 
  1832, 
  and 
  to 
  his 
  own 
  

   and 
  CouERBE'sf 
  researches 
  we 
  owe 
  all 
  our 
  present 
  information 
  regarding 
  it. 
  Both 
  

   these 
  observers 
  have 
  analysed 
  it, 
  but 
  with 
  results 
  quite 
  incompatible 
  with 
  one 
  

   another, 
  and 
  from 
  which 
  they 
  have 
  deduced 
  entirely 
  different 
  formulas. 
  Their 
  

   analyses, 
  when 
  recalculated 
  with 
  the 
  corrected 
  atomic 
  weight 
  of 
  carbon, 
  gave 
  the 
  

   following 
  results: 
  — 
  

  

  ^o 
  

  

  * 
  Annales 
  de 
  Chiinie 
  et 
  de 
  Physique, 
  vol. 
  1., 
  p. 
  262. 
  f 
  Ibid., 
  vol. 
  lix., 
  p. 
  151. 
  

  

  