﻿408 
  MR 
  HENRY 
  HOW 
  ON 
  MECONIC 
  ACID, 
  

  

  ( 
  4*595 
  grains, 
  dried 
  at 
  212°, 
  gave, 
  on 
  ignition, 
  

   \ 
  1468 
  ... 
  silver. 
  

  

  Calculation. 
  

  

  Carbon, 
  

  

  31-92 
  

  

  32-22 
  

  

  C 
  1S 
  

  

  108 
  

  

  Hydrogen, 
  . 
  

  

  2-20 
  

  

  208 
  

  

  H 
  7 
  

  

  7 
  

  

  Oxygen, 
  

  

  

  33-45 
  

  

  °u 
  

  

  112 
  

  

  Silver, 
  

  

  31-94 
  

  

  32-25 
  

  

  Ag 
  

  

  108-1 
  

  

  100-00 
  100-00 
  335-1 
  

  

  which 
  lead 
  to 
  the 
  formula 
  

  

  AgO, 
  HO, 
  C 
  4 
  H 
  s 
  O 
  C 
  u 
  HO 
  n 
  

   for 
  the 
  dried 
  salt 
  ; 
  the 
  crystals 
  contain 
  two 
  equivalents 
  of 
  water, 
  

  

  f 
  10- 
  40 
  grains 
  lost, 
  at 
  212°, 
  

   \ 
  0-545 
  ... 
  water. 
  

  

  This 
  number 
  gives 
  for 
  per-centage 
  5-24 
  ; 
  508 
  is 
  that 
  corresponding 
  to 
  

  

  AgO, 
  HO, 
  C 
  18 
  H 
  6 
  12 
  + 
  2aq. 
  

  

  An 
  aqueous 
  solution 
  of 
  acid 
  ethylomeconate 
  of 
  baryta 
  gives 
  with 
  acetate 
  of 
  lead 
  

   a 
  yellowish 
  white, 
  with 
  sulphate 
  of 
  copper 
  a 
  pale 
  green, 
  and 
  with 
  perchloride 
  of 
  

   iron 
  a 
  red-brown 
  precipitate 
  ; 
  this 
  last 
  is 
  readily 
  soluble 
  in 
  an 
  excess 
  of 
  the 
  iron 
  

   salt, 
  forming 
  with 
  it 
  a 
  dark 
  red 
  fluid. 
  

  

  Neutral 
  Salts 
  of 
  Ethylomeconic 
  Acid. 
  — 
  I 
  have 
  not 
  been 
  successful 
  in 
  procuring 
  

   these 
  salts 
  absolutely 
  pure, 
  although 
  I 
  have 
  tried 
  many. 
  On 
  one 
  occasion 
  1 
  

   obtained, 
  by 
  saturating 
  ethylomeconic 
  acid 
  as 
  nearly 
  as 
  possible 
  with 
  carbonate 
  

   of 
  baryta 
  at 
  a 
  temperature 
  of 
  212", 
  and 
  subsequent 
  filtering 
  of 
  the 
  fluid, 
  a 
  salt 
  

   which 
  deposited 
  on 
  cooling 
  in 
  small 
  short 
  yellow 
  needles 
  ; 
  of 
  this 
  

  

  {3-442 
  grains, 
  dried 
  at 
  212°, 
  gave 
  

   2-197 
  ... 
  sulphate 
  of 
  baryta, 
  

  

  The 
  per-centage 
  of 
  baryta 
  calculated 
  from 
  this 
  is 
  41 
  - 
  89 
  : 
  42'19 
  is 
  the 
  number 
  cor- 
  

   responding 
  to 
  the 
  formula 
  

  

  2 
  BaO, 
  C 
  4 
  H.O 
  C 
  14 
  HO 
  u 
  . 
  

  

  Although 
  this 
  result 
  is 
  satisfactory, 
  I 
  could 
  not 
  succeed 
  upon 
  repetition 
  of 
  the 
  

   experiment 
  in 
  obtaining 
  an 
  analytical 
  number 
  sufficiently 
  close 
  to 
  confirm 
  it. 
  

   Those 
  I 
  obtained 
  by 
  heating 
  ethylomeconic 
  acid 
  with 
  excess 
  of 
  carbonate 
  of 
  baryta, 
  

   varied 
  from 
  42 
  to 
  44*5 
  per 
  cent, 
  baryta, 
  which 
  lead 
  to 
  the 
  conclusion 
  that 
  the 
  acid 
  

   forms 
  basic 
  combinations 
  in 
  addition 
  to 
  acid 
  and 
  neutral 
  salts. 
  The 
  other 
  alkaline 
  

   earths 
  shewed 
  similar 
  deportment 
  with 
  the 
  acid, 
  and 
  when 
  it 
  is 
  heated 
  with 
  an 
  

   excess 
  of 
  carbonate 
  of 
  silver, 
  it 
  remains 
  almost 
  entirely 
  undissolved, 
  — 
  in 
  some 
  

   basic 
  combination. 
  

  

  When 
  ethylomeconic 
  acid 
  is 
  heated 
  with 
  an 
  excess 
  of 
  caustic 
  potass 
  or 
  soda, 
  

   meconates 
  of 
  these 
  bases 
  are 
  produced. 
  An 
  excess 
  of 
  caustic 
  ammonia 
  decom- 
  

   poses 
  it 
  very 
  readily. 
  

  

  