﻿68 
  

  

  Mr. 
  Grervaise 
  Le 
  Bas 
  

  

  on 
  

  

  paraffins. 
  It 
  is 
  thus 
  concluded 
  : 
  — 
  that 
  the 
  relation 
  M.V. 
  of 
  

   03s* 
  | 
  = 
  | 
  = 
  6nS 
  - 
  2-62 
  = 
  WS- 
  ! 
  = 
  ! 
  found 
  to 
  be 
  true 
  for 
  

   the 
  olefines 
  at 
  the 
  melting-point 
  is 
  also 
  true 
  for 
  temperatures 
  

   which 
  are 
  at 
  equal 
  intervals 
  therefrom. 
  

  

  It 
  is 
  possible 
  to 
  show 
  by 
  a 
  method 
  adopted 
  for 
  the 
  saturated 
  

   normal 
  paraffins 
  that 
  under 
  the 
  conditions 
  just 
  stated 
  additive 
  

   relations 
  hold, 
  and 
  also 
  that 
  the 
  valency 
  rule 
  is 
  alone 
  capable 
  

   of 
  explaining 
  the 
  facts. 
  In 
  this 
  instance 
  dodecane 
  C 
  12 
  H 
  26 
  is 
  

   taken 
  as 
  the 
  standard 
  substance, 
  and 
  use 
  is 
  made 
  of 
  the 
  

   apparent 
  volumes 
  under 
  the 
  different 
  circumstances, 
  plus 
  

   the 
  contractions 
  1 
  = 
  1. 
  

  

  Table 
  V. 
  

  

  Table 
  showing- 
  the 
  validity 
  of 
  the 
  Valency 
  Rule 
  

   for 
  the 
  Olefines. 
  

  

  T. 
  

  

  12 
  H 
  26- 
  

  

  C 
  12 
  H 
  2i 
  +l 
  = 
  (. 
  

  

  OuH»+|=|. 
  

  

  16 
  H 
  32 
  +|=|. 
  

  

  C 
  18 
  H 
  S6+ 
  I== 
  I- 
  

  

  M.P 
  

  

  1-0000 
  

  

  0-9728 
  

  

  11342 
  

  

  1-2986 
  

  

  1-4601 
  

  

  „ 
  +10° 
  

  

  

  0-9731 
  

  

  1-1349 
  

  

  1-2983 
  

  

  1-4602 
  

  

  „ 
  +20° 
  

  

  

  

  09731 
  

  

  1-1350 
  

  

  1-2980 
  

  

  1-4599 
  

  

  „ 
  +30° 
  

  

  

  

  0-9730 
  

  

  1-1346 
  

  

  1-2978 
  

  

  1-4595 
  

  

  „ 
  +40° 
  

  

  

  

  0-9732 
  

  

  1-1344 
  

  

  

  

  „ 
  +50° 
  

  

  

  

  0-9730 
  

  

  1-1342 
  

  

  

  

  „ 
  4-60° 
  

  

  

  

  0-9728 
  

  

  

  

  

  „ 
  +70° 
  

  

  

  ' 
  

  

  0-9729 
  

  

  

  

  

  Mean 
  values 
  ... 
  

  

  1-0000 
  

  

  0-9730 
  

  

  1-1345 
  

  

  1-2981 
  

  

  1-4599 
  

  

  Theoretical 
  1 
  

   (4:1 
  rule)... 
  f 
  

  

  74 
  

  

  72 
  

  

  84 
  

  

  96 
  

  

  108 
  

  

  74 
  

  

  74 
  

  

  74 
  

  

  74 
  

  

  74 
  

  

  

  1-0000 
  

  

  0-9730 
  

  

  11351 
  

  

  1-2973 
  

  

  14595 
  

  

  Krrors 
  

  

  

  +0 
  

  

  +0-0000 
  

  

  -0-0008 
  

  

  -0*0004 
  

  

  

  

  

  

  

  

  The 
  above 
  table 
  shows 
  in 
  a 
  striking 
  way 
  that 
  the 
  relations 
  

   attaching 
  to 
  the 
  apparent 
  molecular 
  volumes 
  of 
  the 
  olefines 
  

   under 
  the 
  above 
  circumstances 
  are 
  additive, 
  for 
  the 
  differ- 
  

   ences 
  between 
  the 
  mean 
  values 
  of 
  the 
  ratios 
  are 
  nearly 
  equal 
  

   to 
  '1620. 
  

  

  Also, 
  the 
  validity 
  of 
  the 
  valency 
  rule, 
  under 
  the 
  different 
  

   conditions, 
  is 
  evident 
  from 
  the 
  fact, 
  that 
  the 
  mean 
  values 
  of 
  

   the 
  ratios 
  Follow 
  very 
  closely 
  those 
  obtained 
  by 
  dividing 
  the 
  

   valency 
  numbers 
  of 
  the 
  various 
  olefines 
  by 
  the 
  valency 
  number 
  

   of 
  dodecane 
  CisH 
  M 
  . 
  

  

  