﻿470 
  Seventh 
  Annual 
  Keport 
  of 
  the 
  

  

  queutly, 
  in 
  ease 
  rosin 
  oil 
  is 
  present, 
  the 
  ainonnt 
  of 
  unsaponitiable 
  

   matter 
  wliicli 
  it 
  fnniislios 
  i.s 
  less 
  lliiin 
  tlic; 
  totiil 
  amount 
  of 
  rosin 
  

   oil 
  present. 
  The 
  proportion 
  between 
  that 
  found 
  and 
  the 
  amoiint 
  

   present 
  will 
  vary 
  according 
  to 
  tJie 
  way 
  in 
  which 
  the 
  oil 
  was 
  manii- 
  

   faxjtured, 
  and 
  its 
  consequent 
  contents 
  in 
  unchanged 
  rosin. 
  Ordi- 
  

   narily, 
  the 
  amount 
  of 
  saponitiable 
  matter 
  found 
  due 
  to 
  rosin 
  oil 
  is 
  

   likely 
  to 
  be 
  about 
  nine-tenths 
  of 
  that 
  present. 
  

  

  The 
  amount 
  of 
  unsaponifiable 
  mattor 
  found 
  in 
  the 
  other 
  animal 
  

   and 
  vegetable 
  oils 
  used 
  as 
  linseed 
  oil 
  adulterants 
  is 
  approximately 
  

   the 
  same 
  as 
  that 
  found 
  in 
  linseed 
  oil 
  itself; 
  hence 
  the 
  process 
  does 
  

   not 
  furnish 
  any 
  clue 
  to 
  com, 
  cottonseed, 
  or 
  menhaden 
  oils, 
  if 
  they 
  

   are 
  present. 
  

  

  Petroleum 
  oils 
  may 
  be 
  used 
  in 
  adulterating 
  linseed 
  oil, 
  which 
  

   are 
  just 
  on 
  tlie 
  border 
  line 
  between 
  volatile 
  and 
  practically 
  non- 
  

   volatile 
  oils. 
  Such 
  oil 
  as, 
  for 
  example, 
  kerosene, 
  would 
  partly 
  

   distil 
  off 
  \vith 
  the 
  alcohol 
  in 
  removing 
  it 
  after 
  saponification, 
  while 
  

   the 
  rest 
  of 
  it 
  would 
  remain 
  to 
  be 
  extracted 
  Avith 
  ether 
  from 
  the 
  

   aqueous 
  soap 
  solution, 
  and 
  be 
  weighed 
  as 
  unsaponifiable 
  matter. 
  

   It 
  might 
  easily 
  happen 
  in 
  such 
  a 
  case 
  that 
  the 
  proportion 
  of 
  the 
  

   partly 
  volatile 
  oil, 
  which, 
  would 
  be 
  obtained 
  by 
  distillation 
  with 
  

   steam 
  in 
  the 
  determination 
  of 
  volatUe 
  oil, 
  would 
  be 
  a 
  different 
  

   one 
  from 
  the 
  proportion 
  removed 
  from 
  the 
  saponified 
  oil 
  in 
  dis- 
  

   tilling 
  off 
  the 
  alcohol 
  in 
  the 
  determination 
  of 
  unsaponifiable 
  mat- 
  

   ters, 
  and 
  that 
  the 
  sum 
  of 
  the 
  " 
  volatile 
  oil 
  " 
  and 
  of 
  the 
  " 
  unsaponifi- 
  

   able 
  matter 
  " 
  would 
  be 
  more 
  or 
  less 
  than 
  the 
  true 
  total 
  amount 
  

   of 
  adulterant 
  added. 
  In 
  such 
  a 
  case, 
  it 
  would 
  be 
  advisable 
  to 
  "use 
  

   for 
  the 
  determination 
  of 
  unsaponifiable 
  matter 
  a 
  ]Xirtion 
  of 
  the 
  

   residue 
  from 
  the 
  determination 
  of 
  volatile 
  oil. 
  

  

  4. 
  The 
  Amount 
  or 
  Ai^kali 
  Required 
  to 
  Convert 
  the 
  Oil 
  Into 
  

   Soap. 
  Koettstorfer 
  Figure. 
  

  

  This 
  determination 
  serves 
  in 
  the 
  analysis 
  of 
  linseed 
  oil 
  as 
  an 
  indi- 
  

   cation 
  of 
  the 
  presence 
  or 
  absence 
  of 
  unsaponifiable 
  matter, 
  whether 
  

   volatile 
  or 
  not. 
  Its 
  indications 
  are 
  not 
  as 
  valuable 
  for 
  this 
  pui-pose 
  

   as 
  an 
  actual 
  detennination 
  of 
  the 
  unsaponlfijalde 
  matter 
  itself, 
  but 
  

  

  