﻿Commissioner 
  of 
  Agriculture. 
  467 
  

  

  In 
  carrying 
  out 
  either 
  the 
  Iliihl 
  or 
  the 
  bromine 
  process 
  upon 
  oils, 
  

   it 
  is 
  neee^ai'v 
  that 
  an 
  excess 
  of 
  iodine 
  or 
  bromine 
  should 
  be 
  used 
  

   amounting 
  to 
  ae 
  much 
  as 
  the 
  oil 
  absorbs. 
  Many 
  iodine 
  figaires 
  

   on 
  record 
  are 
  too 
  low 
  because 
  tliis 
  precaution 
  was 
  not 
  attended 
  to. 
  

  

  It 
  is 
  believed 
  that 
  more 
  information 
  is 
  to 
  be 
  obtained 
  a.s 
  to 
  the 
  

   character 
  of 
  a 
  sample 
  of 
  linseed 
  oil 
  by 
  determining 
  the 
  bromine 
  

   figTires 
  than 
  bv 
  anv 
  other 
  sin^-le 
  test. 
  In 
  the 
  ease 
  of 
  an 
  oil 
  of 
  

   unknoAni 
  character, 
  it 
  would 
  in 
  most 
  cases 
  be 
  advisable 
  to 
  apply 
  

   this 
  test 
  first 
  to 
  it. 
  

  

  3. 
  The 
  Peecextage 
  of 
  Unsaponifiable 
  Organic 
  jMatter. 
  

  

  Linseed 
  oil, 
  being 
  composed 
  almost 
  entirely 
  of 
  fatty 
  matter 
  of 
  

   the 
  ordinary 
  type, 
  compounds 
  of 
  fatty 
  acids 
  with 
  glycerin, 
  gives 
  

   only 
  a 
  small 
  percentage 
  of 
  material 
  which 
  cannot 
  be 
  saponified. 
  

   The 
  amoimt 
  to 
  be 
  found 
  in 
  raw 
  linseed 
  oil 
  has 
  been 
  investigated 
  

   by 
  Thomi^son 
  and 
  Ballantyne 
  (J. 
  Soc. 
  Chem. 
  Ind. 
  1891, 
  10, 
  336), 
  

   who 
  find 
  amounts 
  varying 
  from 
  1.09 
  to 
  1.28 
  per 
  cent 
  in 
  oil 
  from 
  

   various 
  sources, 
  and 
  by 
  Rowland 
  Williams 
  (J. 
  Soc. 
  Chem. 
  Ind. 
  

   1898, 
  IT, 
  305), 
  who 
  finds 
  that 
  it 
  varies 
  from 
  0.8 
  to 
  1.3 
  per 
  cent. 
  

   Williams, 
  loc. 
  cit., 
  has 
  also 
  detennined 
  the 
  amount 
  of 
  unsaiponi- 
  

   fiable 
  matter 
  in 
  boiled 
  oil, 
  and 
  finds 
  that 
  the 
  amount 
  is 
  nearly 
  

   twice 
  as 
  great 
  as 
  in 
  raw 
  oil, 
  his 
  figures 
  for 
  boiled 
  oil 
  being 
  1.3 
  to 
  

   2.3 
  i>er 
  cent; 
  being 
  usually 
  about 
  2 
  per 
  cent. 
  Williams 
  regards 
  any 
  

   oil 
  with 
  a 
  percentage 
  of 
  unsaponifiable 
  higher 
  than 
  2.5 
  as 
  adulter- 
  

   ated. 
  His 
  statements 
  refer 
  to 
  oil 
  which 
  has 
  been 
  boiled 
  at 
  a 
  high 
  

   temperature, 
  and 
  the 
  boiled 
  oils 
  for 
  sale 
  in 
  New 
  York 
  State 
  are 
  

   apparently 
  all 
  made 
  at 
  too 
  low 
  a 
  temperature 
  to 
  cause 
  any 
  increase 
  

   in 
  the 
  amount 
  of 
  unsaponifiable 
  matter 
  contained, 
  vnih 
  the 
  excep- 
  

   tion 
  of 
  the 
  oil 
  in 
  the 
  drier. 
  In 
  view 
  of 
  these 
  facts, 
  2.5 
  per 
  cent 
  

   would 
  be 
  a 
  reasonable 
  limit 
  to 
  the 
  amount 
  of 
  unsaponifiable 
  matter 
  

   in 
  linseed 
  oil. 
  This 
  is 
  so 
  Avell 
  established 
  that 
  it 
  was 
  not 
  thought 
  

   advisable 
  to 
  make 
  this 
  detennination 
  upon 
  th.e 
  pure 
  oils 
  examined. 
  

  

  It 
  may 
  be 
  noted 
  that 
  in 
  case 
  an 
  oil 
  is 
  foimd 
  to 
  contain 
  unsaponi- 
  

   fiable 
  matter 
  in 
  excessive 
  amount, 
  the 
  e\idence 
  which 
  can 
  be 
  fur- 
  

   nished 
  the 
  prosecution 
  may 
  be 
  made 
  of 
  the 
  most 
  conclusive 
  charac- 
  

  

  