﻿4G0 
  Seventh 
  Annual 
  RicrouT 
  of 
  the 
  

  

  g-ive 
  tigTire;? 
  bolow 
  100. 
  Allen 
  chives 
  the 
  tionres 
  for 
  raw 
  oil 
  be- 
  

   tween 
  17<> 
  aji<l 
  1!^1. 
  ]fo\vland 
  Williams 
  states 
  that 
  a 
  very 
  large 
  

   number 
  of 
  raw 
  linseed 
  oils 
  examined 
  by 
  him 
  almost 
  all 
  gave 
  

   figures 
  al>ove 
  IS*'. 
  'Vhe 
  figure 
  is 
  rcdncerl 
  l)y 
  keeping. 
  From 
  the 
  

   table 
  of 
  results 
  obtiiined 
  upon 
  the 
  oils 
  examined, 
  it 
  will 
  be 
  seen 
  

   that 
  the 
  figin-e 
  of 
  ])uro 
  <h1 
  is 
  commonly 
  in 
  tlie 
  noighlyorhrKxl 
  of 
  

   178. 
  

  

  It 
  is 
  a 
  noteworthy 
  fact 
  that 
  both 
  the 
  Hubl 
  and 
  the 
  Bromine 
  

   Addition 
  figures 
  are 
  practically 
  the 
  same 
  for 
  boiled 
  oil 
  as 
  now 
  

   made 
  as 
  for 
  raw 
  oil, 
  whereas 
  boiled 
  oil 
  made 
  by 
  the 
  old 
  process 
  at 
  

   a 
  high 
  temperature 
  gave 
  distinctly 
  lower 
  figures 
  on 
  account 
  of 
  the 
  

   eflfectis 
  of 
  the 
  hig'h 
  heiat 
  upon 
  the 
  oil. 
  

  

  Tn 
  order 
  to 
  facilitate 
  comparison 
  between 
  the 
  Ilnbl 
  and 
  the 
  bro- 
  

   mine 
  fig,'iu'es 
  of 
  the 
  oils 
  examined, 
  the 
  amount 
  of 
  bromine 
  equivo- 
  

   lent 
  to 
  the 
  iodine 
  absorbed 
  as 
  expressed 
  by 
  the 
  Hnbl 
  figure 
  hias 
  

   been 
  calculated, 
  and 
  by 
  diAdding 
  this 
  result 
  by 
  the 
  Bromine 
  Addi- 
  

   tion 
  Figure 
  a 
  figiire 
  was 
  obtained 
  for 
  each 
  oil 
  which 
  is 
  intended 
  to 
  

   express, 
  by 
  the 
  amount 
  it 
  exceeds 
  1.000, 
  the 
  amount 
  of 
  siiljsti- 
  

   tuti'on 
  of 
  iodine 
  wliich 
  has 
  gone 
  on 
  in 
  the 
  Hubl 
  iodine 
  absorp- 
  

   tion. 
  For 
  example, 
  if 
  the 
  figure 
  obtained 
  for 
  an 
  oil 
  by 
  the 
  cal- 
  

   culation 
  described 
  is 
  found 
  to 
  be 
  1.075, 
  it 
  indicates 
  that 
  the 
  Hubl 
  

   figure 
  is 
  in 
  that 
  case 
  7.5 
  per 
  cent 
  higher 
  that 
  the 
  true 
  iodine 
  

   figTire 
  which 
  should 
  express 
  the 
  iodine 
  absorption 
  by 
  addition. 
  

  

  The 
  Hiibl 
  figures 
  of 
  a 
  number 
  of 
  the 
  oils 
  received 
  last 
  were 
  not 
  

   determined, 
  because 
  it 
  did 
  not 
  appear 
  that 
  the 
  determinations 
  would 
  

   add 
  any 
  infonnation 
  to 
  that 
  given 
  more 
  fully 
  by 
  the 
  bromine 
  fibres. 
  

  

  It 
  is 
  not 
  believed 
  that 
  the 
  Bromine 
  Addition 
  Figure 
  is 
  sensibly 
  

   aft"ected 
  by 
  the 
  length 
  of 
  time 
  that 
  the 
  oil 
  is 
  allowed 
  to 
  remain 
  

   in 
  contact 
  ^xith 
  Ijromine, 
  but 
  the 
  Bromine 
  Substitution 
  Figure 
  

   probably 
  Ls. 
  The 
  effect 
  of 
  the 
  difference 
  between 
  five 
  minutes' 
  and 
  

   thirty 
  minutes' 
  contact 
  does 
  not 
  appear, 
  however, 
  to 
  be 
  marked, 
  

   unle« 
  the 
  substitution 
  figure 
  is 
  very 
  high, 
  as 
  in 
  the 
  case 
  of 
  pure 
  

   rosin 
  or 
  tuq>entine. 
  The 
  results 
  reported 
  were 
  obtained 
  by 
  or 
  about 
  

   fifteen 
  minutes' 
  contact. 
  

  

  