﻿628 
  Prof. 
  Kuenen 
  and 
  Mr. 
  Eobson 
  on 
  the 
  Th 
  

  

  130 
  calories, 
  it 
  appears 
  that 
  the 
  latent 
  heat 
  of 
  sublimation 
  

   increases 
  as 
  the 
  temperature 
  rises. 
  This 
  phenomenon 
  is 
  very 
  

   rare 
  for 
  liquids, 
  and 
  in 
  that 
  case 
  may 
  be 
  looked 
  upon 
  as 
  

   due 
  to 
  association 
  of 
  liquid 
  molecules, 
  e. 
  g. 
  in 
  the 
  case 
  of 
  

   alcohol*; 
  in 
  any 
  case 
  there 
  is 
  nothing 
  strange 
  in 
  the 
  fact 
  

   of 
  the 
  latent 
  heat 
  of 
  a 
  solid 
  rising 
  with 
  the 
  temperature. 
  

  

  II. 
  Ethane. 
  

  

  From 
  our 
  results 
  for 
  ethane 
  contained 
  in 
  the 
  same 
  paper 
  

   we 
  have 
  calculated 
  the 
  figures 
  in 
  Table 
  IV. 
  For 
  easy 
  com- 
  

   parison 
  we 
  have 
  added 
  the 
  corresponding 
  temperatures 
  for 
  

   carbon 
  tetrachloride 
  and 
  the 
  percentage 
  differences 
  between 
  

   that 
  substance 
  and 
  ethane. 
  All 
  the 
  reduced 
  temperatures 
  are 
  

  

  Table 
  IV. 
  

   Corresponding 
  States. 
  Ethane. 
  

   Critical 
  Temperature 
  ... 
  305°"05. 
  

  

  Critical 
  Pressure 
  4843 
  atmospheres. 
  

  

  Critical 
  Volume 
  4'84 
  c.c. 
  per 
  gramme. 
  

  

  Reduced 
  

  

  Reduced 
  

  

  CC1 
  4 
  . 
  

  

  Difference 
  

  

  Pressure. 
  

   •04423 
  

  

  Temperature. 
  

  

  per 
  cent. 
  

  

  •6501 
  

  

  •6728 
  

  

  3 
  

  

  •08846 
  

  

  •7082 
  

  

  •7251 
  

  

  2-5 
  

  

  •1474 
  

  

  •7543 
  

  

  •7697 
  

  

  2 
  

  

  •2064 
  

  

  •7909 
  

  

  •8025 
  

  

  1-5 
  

  

  •2949 
  

  

  •8313 
  

  

  •8411 
  

  

  1-2 
  

  

  •4423 
  

  

  •8830 
  

  

  •8889 
  

  

  •7 
  

  

  •5899 
  

  

  •9205 
  

  

  •9260 
  

  

  ■6 
  

  

  •7372 
  

  

  •9530 
  

  

  •9565 
  

  

  •4 
  

  

  •8257 
  

  

  •9700 
  

  

  •9725 
  

  

  •3 
  

  

  •884G 
  

  

  •9807 
  

  

  •9822 
  

  

  •15 
  

  

  •9436 
  

  

  •9910 
  

  

  •9917 
  

  

  •1 
  

  

  1-0000 
  

  

  1-0000 
  

  

  10000 
  

  

  ■ 
  — 
  

  

  lower 
  than 
  for 
  carbon 
  tetrachloride, 
  and 
  are 
  thus 
  lower 
  

   than 
  for 
  any 
  other 
  substance 
  in 
  Young's 
  tables. 
  The 
  differ- 
  

   ences 
  increase 
  extremely 
  regularly 
  as 
  the 
  temperature 
  falls. 
  

   As 
  far 
  as 
  accidental 
  errors 
  are 
  concerned, 
  our 
  estimate 
  of 
  the 
  

   uncertainty 
  of 
  our 
  measurements 
  given 
  in 
  our 
  former 
  paper 
  

   (less 
  than 
  1 
  per 
  cent.) 
  was 
  thus 
  evidently 
  too 
  great. 
  But 
  

   there 
  is 
  a 
  systematic 
  difference 
  which 
  rises 
  to 
  3 
  per 
  cent, 
  at 
  

  

  * 
  Tsuruta 
  (Phil. 
  Mag-. 
  [5] 
  xxxv. 
  p. 
  435) 
  finds 
  a 
  maximum 
  for 
  the 
  

   latent 
  heat 
  of 
  hydrochloric 
  acid, 
  which 
  is 
  probably 
  a 
  normal 
  substance. 
  

  

  