﻿Commissioner 
  of 
  Agricultuke. 
  471 
  

  

  thev 
  are 
  more 
  readily 
  obtained. 
  The 
  determination 
  is 
  made 
  by 
  

   tlie 
  well-known 
  Koettstorfer 
  jDrocess. 
  About 
  2.5 
  gTams 
  of 
  tbe 
  oil 
  

   is 
  weighed 
  into 
  a 
  flask, 
  25 
  c. 
  c. 
  of 
  lialf-normal 
  alcoholic 
  solution 
  of 
  

   caustic 
  potash 
  added, 
  and 
  the 
  liquid 
  boiled 
  on 
  the 
  water 
  bath 
  Avith 
  

   a 
  return 
  condenser, 
  with 
  frequent 
  shaking, 
  for 
  about 
  two 
  hours. 
  

   The 
  liquid 
  in 
  the 
  flask 
  is 
  then 
  titrated 
  with 
  half-normial 
  hydro- 
  

   chloric 
  acid, 
  using 
  phenolphthalein 
  as 
  indicator. 
  Twenty-tive 
  c. 
  c. 
  

   of 
  the 
  same 
  alcoholic 
  caustic 
  potash 
  is 
  titrated 
  at 
  the 
  same 
  time, 
  and 
  

   the 
  difference 
  between 
  the 
  two 
  titrations 
  gives 
  the 
  alkali 
  used 
  in 
  

   saponifying 
  the 
  oil, 
  and 
  when 
  calculated 
  in 
  milligrams 
  of 
  potassium 
  

   hydroxide 
  lo 
  a 
  gram 
  of 
  oil, 
  it 
  is 
  called 
  the 
  " 
  Koettstorfer 
  Figure." 
  

  

  The 
  Koettstorfer 
  Fioiu-e 
  of 
  ra,w 
  linseed 
  oil 
  is 
  oiyen 
  by 
  Benedikt 
  

   from 
  187.6 
  to 
  195.2, 
  and 
  by 
  Allen 
  from 
  187.4 
  to 
  195.2. 
  Bene- 
  

   dikt's 
  figau-es 
  for 
  boiled 
  are 
  from 
  180 
  to 
  190, 
  and 
  Allen's 
  figure, 
  

   calculated 
  from 
  his 
  " 
  Saponification 
  Equivalent," 
  is 
  188. 
  Bene- 
  

   dikt's 
  figures 
  are 
  on 
  the 
  authority 
  of 
  Eilsinger, 
  Chem. 
  Zeit., 
  1894, 
  

   18, 
  1867, 
  and 
  evidently 
  apply 
  to 
  old-fashioned, 
  strongly 
  heated 
  

   boiled 
  oil. 
  Both 
  the 
  exposure 
  to 
  high 
  heat 
  and 
  the 
  introduction 
  

   of 
  manganese 
  and 
  lead 
  soaps 
  of 
  linseed 
  oil 
  in 
  the 
  drier 
  tend 
  to 
  

   reduce 
  the 
  Koettstorfer 
  figure. 
  Of 
  the 
  two, 
  exposure 
  to- 
  high 
  heat 
  

   for 
  a 
  long 
  time, 
  as 
  in 
  the 
  old-fashioned 
  boiling 
  process, 
  reduces 
  it 
  

   far 
  more 
  than 
  the 
  introduction 
  of 
  the 
  small 
  percentage 
  of 
  lead 
  

   and 
  manganese 
  soaps 
  as 
  used 
  in 
  practice. 
  The 
  boiled 
  oils 
  now 
  for 
  

   sale 
  in 
  this 
  State 
  have, 
  as 
  will 
  be 
  seen 
  from 
  the 
  table, 
  almost 
  as 
  

   high 
  figiires 
  as 
  the 
  raw 
  oils. 
  It 
  may 
  fairly 
  bo 
  demanded 
  of 
  a 
  raw 
  

   oil 
  that 
  its 
  figure 
  shall 
  not 
  be 
  lower 
  than 
  187, 
  and 
  of 
  a 
  boiled 
  oil 
  

   not 
  lower 
  than 
  186. 
  

  

  A 
  low 
  figiu'e 
  indicates 
  the 
  presence 
  of 
  mineral 
  oil, 
  having 
  a 
  figiire 
  

   below 
  10; 
  of 
  rosin 
  oil, 
  having 
  a 
  figure 
  below 
  20, 
  or 
  of 
  benzine 
  or 
  

   tui"pentino, 
  of 
  both 
  of 
  which 
  the 
  figures 
  are 
  practically 
  0.0. 
  Pure 
  

   hydrocarbons 
  give 
  a 
  Koettstorfer 
  figiu*e 
  of 
  0.0, 
  but 
  mineral 
  oils 
  

   usnallv 
  contain 
  traces 
  either 
  of 
  mineral 
  acid 
  from 
  the 
  refining 
  

   process, 
  or 
  of 
  organic 
  acids 
  from 
  oxidation 
  by 
  the 
  air, 
  and 
  rosin 
  

   oils 
  contain 
  some 
  unchanged 
  rosin, 
  which 
  acountti 
  for 
  the 
  Koetts- 
  

   torfer 
  figures. 
  

  

  