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  XIV. 
  — 
  On 
  the 
  Products 
  of 
  the 
  Destructive 
  Distillation 
  of 
  Animal 
  Substances. 
  Part 
  II. 
  

  

  By 
  Thomas 
  Andeeson, 
  M.D. 
  

  

  (Read 
  21st 
  April 
  1851.) 
  

  

  I 
  propose 
  in 
  the 
  following 
  pages 
  to 
  communicate 
  to 
  the 
  Society 
  the 
  progress 
  

   of 
  my 
  investigation 
  of 
  the 
  products 
  of 
  the 
  destructive 
  distillation 
  of 
  animal 
  sub- 
  

   stances, 
  the 
  first 
  part 
  of 
  which 
  was 
  published 
  in 
  the 
  16th 
  volume 
  of 
  the 
  Trans- 
  

   actions. 
  Since 
  that 
  period, 
  partly 
  owing 
  to 
  my 
  numerous 
  avocations, 
  and 
  partly 
  

   to 
  the 
  inherent 
  difficulties 
  of 
  the 
  subject, 
  less 
  progress 
  has 
  been 
  made 
  than 
  I 
  had 
  

   hoped 
  or 
  expected, 
  but 
  still 
  I 
  have 
  accumulated 
  some 
  facts 
  of 
  considerable 
  inte- 
  

   rest, 
  which 
  I 
  think 
  deserving 
  of 
  the 
  attention 
  of 
  the 
  Society. 
  

  

  It 
  may 
  be 
  remembered 
  that, 
  in 
  the 
  paper 
  just 
  referred 
  to, 
  I 
  announced 
  the 
  

   discovery, 
  among 
  those 
  products, 
  of 
  picoline, 
  which 
  I 
  formerly 
  obtained 
  from 
  coal- 
  

   tar, 
  and 
  of 
  a 
  new 
  base, 
  to 
  which 
  I 
  gave 
  the 
  name 
  of 
  Petinine 
  ; 
  and 
  I 
  entered 
  

   pretty 
  fully 
  into 
  the 
  method 
  adopted 
  for 
  the 
  preparation 
  of 
  these 
  substances, 
  

   and 
  of 
  certain 
  other 
  bases, 
  the 
  existence 
  of 
  which 
  I 
  merely 
  indicated, 
  without 
  at 
  

   the 
  time 
  attempting 
  to 
  characterize 
  them. 
  On 
  proceeding 
  to 
  the 
  more 
  minute 
  

   investigation 
  of 
  these 
  bases, 
  I 
  soon 
  found 
  that 
  the 
  quantity 
  of 
  material 
  at 
  my 
  

   disposal 
  was 
  much 
  too 
  small 
  to 
  admit 
  of 
  satisfactory 
  or 
  complete 
  results, 
  although 
  

   I 
  had 
  employed 
  for 
  their 
  preparation 
  above 
  300 
  pounds 
  of 
  bone-oil. 
  I 
  found 
  

   it 
  necessary, 
  therefore, 
  to 
  begin 
  ah 
  initio 
  with 
  the 
  preparation 
  of 
  the 
  bases 
  from 
  

   another 
  equally 
  large 
  quantity 
  of 
  the 
  oil 
  ; 
  and 
  after 
  going 
  through 
  the 
  whole 
  of 
  

   the 
  tedious 
  processes 
  described 
  in 
  my 
  previous 
  paper, 
  with 
  the 
  expenditure 
  of 
  the 
  

   labour 
  of 
  some 
  months, 
  I 
  found 
  my 
  object 
  again 
  defeated 
  by 
  deficiency 
  of 
  mate- 
  

   rial. 
  After 
  various 
  experiments, 
  which, 
  though 
  they 
  led 
  to 
  no 
  definite 
  or 
  con- 
  

   clusive 
  results, 
  served 
  to 
  familiarize 
  me 
  with 
  the 
  nature 
  and 
  relations 
  of 
  the 
  

   products 
  obtained, 
  I 
  made 
  up 
  my 
  mind 
  once 
  more 
  to 
  begin 
  again; 
  and 
  being 
  

   resolved 
  on 
  this 
  occasion 
  not 
  to 
  be 
  foiled 
  in 
  the 
  same 
  way 
  as 
  before, 
  I 
  used 
  for 
  my 
  

   new 
  preparation 
  no 
  less 
  than 
  250 
  gallons 
  of 
  crude 
  bone-oil, 
  the 
  weight 
  of 
  which 
  was 
  

   somewhat 
  above 
  a 
  ton. 
  The 
  result 
  of 
  this 
  process, 
  though 
  involving 
  an 
  immense 
  

   amount 
  of 
  labour, 
  has 
  been 
  satisfactory, 
  not 
  only 
  in 
  supplying 
  me 
  with 
  a 
  large 
  

   amount 
  of 
  material, 
  but 
  has 
  also 
  enabled 
  me 
  to 
  obtain 
  many 
  substances, 
  some 
  of 
  

   them 
  possessed 
  of 
  very 
  remarkable 
  properties, 
  which 
  had 
  escaped 
  my 
  observation 
  

   when 
  operating 
  on 
  a 
  smaller 
  scale. 
  

  

  The 
  employment 
  of 
  so 
  large 
  quantity 
  of 
  material 
  has, 
  as 
  might 
  be 
  expected, 
  

   led 
  to 
  some 
  modification 
  of 
  the 
  process 
  described 
  in 
  the 
  first 
  part 
  of 
  this 
  paper, 
  

  

  VOL. 
  XX. 
  PART 
  II. 
  3 
  x 
  

  

  