﻿74 
  

  

  Mr. 
  Grervaise 
  Le 
  Bas 
  

  

  The 
  above 
  values 
  are 
  significant 
  because 
  they 
  represent 
  

   the 
  volumes 
  o£ 
  H 
  in 
  the 
  acetylenes 
  under 
  the 
  different 
  cir- 
  

   cumstances. 
  

  

  The 
  following 
  alternative 
  method, 
  which 
  has 
  already 
  been 
  

   utilized, 
  is 
  valuable 
  for 
  the 
  purpose 
  of 
  demonstrating 
  the 
  

   validity 
  of 
  the 
  valency 
  rule 
  in 
  a 
  different 
  way. 
  Use 
  is 
  made 
  

   of 
  the 
  observed 
  volumes 
  of 
  the 
  acetylenes 
  at 
  the 
  different 
  

   temperatures, 
  plus 
  the 
  contractions 
  as 
  in 
  the 
  former 
  table. 
  

  

  Table 
  XII. 
  

  

  Table 
  showing 
  the 
  validity 
  of 
  the 
  Valency 
  Rule 
  

   for 
  the 
  Acetylenes. 
  

  

  T. 
  

  

  C 
  12 
  H 
  2G 
  . 
  

  

  C12H22 
  1 
  = 
  !• 
  

  

  C 
  14 
  H 
  26 
  |-|. 
  

  

  C 
  lb 
  H 
  30 
  |-|. 
  

  

  C 
  1 
  sH, 
  i 
  -|. 
  

  

  M.P 
  

  

  „ 
  +10° 
  ... 
  

  

  ,. 
  +20 
  

  

  ,. 
  +30 
  

  

  „ 
  +40 
  

  

  .., 
  +50 
  

  

  1-0000 
  

  

  - 
  

  

  ;; 
  

  

  0-9453 
  

   0-9459 
  

   09473 
  

   0-9453 
  

   9461 
  

   0-9461 
  

  

  1-1073 
  

   1-1078 
  

   1-1076 
  

   1-1077 
  

  

  1-2692 
  

   1-2693 
  

   1-2688 
  

   1-2684 
  

  

  1-4315 
  

  

  Mean 
  values 
  ... 
  

   IW/W' 
  

  

  1-0000 
  

  

  74 
  

  

  74 
  

   1-0000 
  

  

  

  

  0-9460 
  

  

  70 
  

  

  74 
  

  

  0-9459 
  

  

  -00001 
  

  

  1-1081 
  

  

  82 
  

   74 
  

  

  1-1081 
  

  

  +0-0005 
  

  

  1-2689 
  

   94 
  

  

  74 
  

  

  12702 
  

   +0-0013 
  

  

  1-4315 
  

  

  106 
  

  

  74 
  

  

  1-4324 
  

  

  +0-0009 
  

  

  

  

  The 
  above 
  table 
  shows 
  unmistakably 
  that 
  the 
  volume 
  

   relations 
  of 
  the 
  acetylenes 
  under 
  the 
  conditions 
  are 
  essentially 
  

   additive, 
  and 
  further 
  that 
  the 
  valency 
  rule 
  with 
  the 
  requisite 
  

   modification 
  for 
  unsaturation, 
  is 
  alone 
  capable 
  of 
  adequately 
  

   expressing 
  the 
  results. 
  

  

  It 
  is 
  thus 
  concluded 
  that 
  the 
  general 
  formula 
  M.Y. 
  of 
  

   C 
  M 
  H2n_2| 
  ==l 
  = 
  6nS— 
  2S— 
  1 
  = 
  1 
  holds 
  good 
  not 
  only 
  at 
  the 
  

   melting- 
  poi 
  nt 
  but 
  also 
  at 
  equal 
  inU 
  rvals 
  of 
  temperature 
  

   therefrom. 
  

  

  The 
  average 
  contraction 
  for 
  unsaturation 
  is 
  evidently 
  not 
  

   far 
  from 
  3 
  units 
  (or 
  these 
  acetylenes, 
  and 
  it 
  is 
  apparently 
  

   constant, 
  both 
  as 
  regards 
  complexity 
  and 
  temperature, 
  a» 
  

   least 
  in 
  the 
  cases 
  that 
  have 
  been 
  considered. 
  

  

  It 
  now 
  remains 
  to 
  tabulate 
  the 
  results 
  that 
  have 
  been 
  

  

  Z 
  

  

  obtained 
  with 
  reference 
  

  

  to 
  the 
  values 
  of 
  '-.' 
  

  

  