﻿the 
  Unit-Steve 
  Theory. 
  

  

  Table 
  XIII. 
  

  

  The 
  validity 
  of 
  the 
  Law 
  o£ 
  Coincident 
  States. 
  

  

  75 
  

  

  T. 
  C 
  12 
  H 
  26 
  

  

  M.P. 
  ...1 
  1-0000 
  

   „ 
  +10°i0-9913 
  

   „ 
  +20 
  io-9824 
  

   „ 
  +30 
  J0-9735 
  

   „ 
  +40 
  109644 
  

   „ 
  +50 
  09552 
  

  

  C 
  12 
  H 
  2 
  J=| 
  

  

  1-0000 
  

   0-9910 
  

   0-9819 
  

   0-9730 
  

   0-9636 
  

   0-9544 
  

  

  12 
  H 
  M 
  | 
  = 
  | 
  

  

  *-'U-"-30 
  

  

  OuH 
  aB 
  |=| 
  

  

  roooo 
  

  

  0-9910 
  

   0-9821 
  

   0-9731 
  

  

  14 
  H 
  26 
  =1 
  

  

  1-0000 
  

   0-9913 
  

   0-9826 
  

   0-9738 
  

  

  15 
  H 
  32 
  | 
  = 
  | 
  

  

  0„H 
  ao 
  |=i 
  

  

  1-0000 
  

   0-9908 
  

   0-9816 
  

   09724 
  

   0-9632 
  

   09540 
  

  

  1-0000 
  

   0-9910 
  

   0-9820 
  

  

  0-9730 
  

  

  1-0000 
  

   0-9910 
  

   9820 
  

   0-9730 
  

  

  1-0000 
  

   0-9913 
  

   0-9826 
  

   0-9738 
  

  

  1-0000 
  ! 
  

  

  0-9913 
  

  

  0-9826 
  

  

  0-9738 
  

  

  It 
  is 
  concluded 
  that 
  the 
  following 
  rule 
  holds 
  for 
  the 
  

   acetylenes 
  as 
  it 
  does 
  for 
  the 
  paraffins 
  and 
  the 
  olefines. 
  

  

  r 
  lhe 
  specific 
  gravities 
  of 
  the 
  acetylenes 
  at 
  equal 
  intervals 
  of 
  

   temperature 
  from 
  the 
  melting 
  -points 
  are 
  equal 
  fractions 
  of 
  their 
  

   specific 
  gravities 
  at 
  those 
  points. 
  

  

  The 
  law 
  of 
  additivity 
  and 
  the 
  law 
  of 
  coincident 
  states 
  are 
  

   thus 
  considered 
  to 
  be 
  true 
  under 
  similar 
  circumstances 
  for 
  

   the 
  members 
  of 
  the 
  three 
  series 
  which 
  have 
  been 
  studied, 
  

   namely 
  : 
  the 
  normal 
  saturated 
  paraffins, 
  the 
  olefines, 
  and 
  the 
  

   acetylenes, 
  and 
  they 
  are 
  mutually 
  dependent, 
  

  

  The 
  Simpler 
  Olefines 
  and 
  other 
  Unsaturated 
  Compounds 
  

   at 
  the 
  Soiling-Point. 
  

  

  A 
  study 
  of 
  the 
  complex 
  saturated 
  paraffins 
  in 
  the 
  neigh- 
  

   bourhood 
  of 
  the 
  melting-point, 
  has 
  led 
  to 
  the 
  conclusion 
  that 
  

   there 
  is 
  an 
  extra 
  contraction 
  when 
  two 
  or 
  four 
  hydrogen 
  

   atoms 
  have 
  been 
  eliminated. 
  It 
  will 
  be 
  interesting 
  to 
  find 
  

   out 
  if 
  this 
  is 
  true 
  when 
  the 
  volumes 
  of 
  the 
  compounds 
  are 
  

   examined 
  at 
  the 
  boiling-point. 
  

  

  An 
  extended 
  study 
  of 
  the 
  data 
  at 
  this 
  point 
  shows 
  that 
  

   there 
  is 
  no 
  extra 
  contraction 
  to 
  be 
  considered, 
  that 
  is 
  to 
  say, 
  

   the 
  olefines 
  and 
  the 
  acetylenes 
  differ 
  in 
  volume 
  from 
  the 
  

   saturated 
  paraffins 
  by 
  an 
  amount 
  equal 
  to 
  the 
  volumes 
  of 
  the 
  

   hydrogen 
  atoms 
  by 
  which 
  they 
  differ 
  in 
  composition. 
  

   Horstmann 
  has 
  made 
  a 
  very 
  thorough 
  study 
  of 
  the 
  differences 
  

   to 
  be 
  observed 
  between 
  the 
  volumes 
  of 
  saturated 
  and 
  olefinoid 
  

   compounds 
  at 
  the 
  boiling-point, 
  and 
  has 
  found 
  that 
  the 
  

   elimination 
  of 
  two 
  hydrogen 
  atoms 
  is 
  responsible 
  for 
  a 
  

   contraction 
  of 
  about 
  7*4 
  c.c. 
  per 
  gramme 
  molecule. 
  This 
  

   number 
  has 
  already 
  been 
  shown 
  to 
  represent 
  the 
  volume 
  of 
  

   H 
  2 
  under 
  the 
  circumstances. 
  The 
  evidence 
  in 
  favour 
  of 
  the 
  

   relation 
  C 
  = 
  4H 
  is 
  thus 
  reasonably 
  certain 
  as 
  it 
  has 
  been 
  

   obtained 
  under 
  a 
  great 
  variety 
  of 
  circumstances. 
  It 
  is 
  also 
  

   worthy 
  of 
  note 
  that 
  the 
  above-mentioned 
  constant 
  differences 
  

  

  