﻿the 
  Unit-Steve 
  Theory. 
  

   Values 
  of 
  V/W 
  for 
  C 
  18 
  H 
  36 
  -| 
  = 
  |. 
  

  

  67 
  

  

  T. 
  

  

  V. 
  

  

  V+|=|. 
  

  

  V/W. 
  

  

  1 
  

  

  l% 
  oi 
  i 
  v/w. 
  

  

  M.P 
  

  

  „ 
  +10° 
  

  

  218-58 
  

   321-39 
  

   324-28 
  

   327-17 
  

  

  321-13 
  

   323-94 
  

   326-83 
  

   329-72 
  

  

  2-973 
  

   2-999 
  

   3-026 
  

   3053 
  

  

  327-11 
  2-973 
  

   329-95 
  '• 
  2-999 
  

   332-89 
  1 
  3026 
  

   335-89 
  i 
  3-053 
  

  

  ! 
  

  

  „ 
  +20° 
  

  

  „ 
  +30° 
  

  

  

  So 
  far 
  as 
  can 
  be 
  seen, 
  the 
  contractions 
  for 
  unsaturation 
  are 
  

   independent 
  both 
  of 
  the 
  temperature 
  and 
  of 
  the 
  complexity 
  

   of 
  the 
  above 
  defines 
  — 
  or 
  at 
  least 
  there 
  is 
  no 
  clear 
  difference 
  

   between 
  the 
  numbers. 
  The 
  contractions 
  for 
  unsaturation 
  

   depend 
  only 
  upon 
  the 
  olehne 
  bonds, 
  for 
  the 
  apparent 
  volumes 
  

   of 
  the 
  atoms 
  in 
  the 
  saturated 
  portions 
  of 
  the 
  molecules 
  

   possess 
  similar 
  volumes 
  under 
  particular 
  conditions 
  to 
  those 
  

   of 
  the 
  normal 
  paraffins. 
  The 
  mean 
  value 
  of 
  | 
  = 
  | 
  is 
  2*62. 
  

  

  By 
  the 
  simple 
  process 
  of 
  adding 
  the 
  mean 
  value 
  of 
  the 
  

   contraction 
  for 
  each 
  olefine 
  to 
  the 
  apparent 
  volume 
  under 
  

   each 
  of 
  the 
  conditions, 
  and 
  then 
  dividing 
  by 
  the 
  valency 
  

   number 
  W, 
  the 
  validity 
  of 
  the 
  valency 
  rule 
  is 
  shown, 
  which 
  

   rule 
  of 
  course 
  depends 
  upon 
  the 
  fact 
  that 
  C 
  = 
  4H 
  in 
  each 
  

   case. 
  The 
  apparent 
  molecular 
  volumes 
  of 
  the 
  compounds 
  

   are 
  thus 
  expressed 
  as 
  the 
  sum 
  of 
  two 
  terms 
  one 
  of 
  which 
  

   is 
  proportional 
  to 
  the 
  valency 
  numbers 
  W, 
  and 
  the 
  other 
  is 
  

   constant. 
  

  

  M.V. 
  of 
  C„H 
  2n 
  

  

  the 
  melting-point. 
  

  

  - 
  =6hS-2-62=WS-| 
  = 
  | 
  S 
  = 
  2-970 
  at 
  

  

  Table 
  IV. 
  

  

  Table 
  showing 
  the 
  Values 
  of 
  V/W 
  for 
  the 
  Olefines 
  at 
  equal 
  

   intervals 
  of 
  Temperature 
  from 
  the 
  Melting-points. 
  

  

  T. 
  

  

  C 
  12^26- 
  

  

  jC 
  12 
  H 
  24 
  | 
  = 
  | 
  

  

  k 
  4 
  H 
  28 
  |=[. 
  

  

  ( 
  -16H.32i— 
  • 
  

  

  c 
  18 
  h 
  3S 
  |=:. 
  

  

  M.P 
  

  

  2-970 
  

  

  2-971 
  

  

  2-970 
  

  

  2-975 
  

  

  2973 
  

  

  „ 
  +10° 
  

  

  2-997 
  

  

  2-998 
  

  

  2-997 
  

  

  3000 
  

  

  2-999 
  

  

  , 
  

  

  +20° 
  

  

  3025 
  

  

  3-025 
  

  

  1 
  3023 
  

  

  3-027 
  

  

  3026 
  

  

  

  +30° 
  

  

  3-053 
  

  

  3053 
  

  

  3-051 
  

  

  3-054 
  

  

  3053 
  

  

  } 
  

  

  +40° 
  

  

  3-081 
  

  

  3-082 
  

  

  3-080 
  

  

  

  

  

  +50° 
  

  

  3-111 
  

  

  3-111 
  

  

  3-109 
  

  

  

  

  , 
  

  

  +60° 
  

  

  3142 
  

  

  3-141 
  

  

  

  

  

  ' 
  

  

  +70° 
  

  

  3-173 
  

  

  3-171 
  

  

  1 
  

  

  1 
  

   | 
  

  

  

  

  The 
  above 
  table 
  shows 
  in 
  a 
  remarkable 
  way 
  that 
  the 
  

   apparent 
  volumes 
  of 
  the 
  compounds 
  above 
  the 
  melting-point 
  

   become 
  comparable 
  at 
  equal 
  intervals 
  of 
  temperature 
  there- 
  

   from, 
  exactly 
  as 
  was 
  found 
  to 
  be 
  the 
  case 
  with 
  the 
  normal 
  

  

  F 
  2 
  

  

  

  