﻿On 
  Vapours 
  of 
  Organic 
  Liquids 
  in 
  Dust-free 
  Air. 
  305 
  

   Summary 
  of 
  Results. 
  

  

  The 
  results 
  obtained 
  from 
  this 
  research 
  may 
  be 
  summarized 
  

   as 
  follows 
  : 
  — 
  

  

  (1) 
  The 
  rate 
  at 
  which 
  the 
  ions 
  recombine 
  in 
  ionized 
  air 
  

  

  is 
  determined 
  by 
  the 
  same 
  law, 
  namely, 
  -j- 
  — 
  —un 
  2 
  , 
  

  

  no 
  matter 
  what 
  the 
  pressure 
  of 
  the 
  gas 
  may 
  be, 
  at 
  

   least 
  between 
  the 
  limits 
  of 
  *125 
  of 
  an 
  atmosphere 
  and 
  

   3 
  atmospheres. 
  

  

  (2) 
  The 
  coefficient 
  of 
  recombination 
  for 
  the 
  ions 
  in 
  air 
  is 
  

   independent 
  of 
  the 
  pressure 
  of 
  the 
  air 
  for 
  the 
  same 
  

   range 
  of 
  pressures 
  as 
  above. 
  

  

  (3) 
  The 
  absolute 
  value 
  of 
  this 
  coefficient 
  has 
  been 
  deter- 
  

   mined 
  and 
  has 
  been 
  found 
  to 
  be 
  3384 
  e, 
  or 
  on 
  sub- 
  

   stituting 
  the 
  value 
  of 
  the 
  charge 
  on 
  an 
  ion 
  it 
  becomes 
  

   2-20 
  x 
  10- 
  6 
  . 
  

  

  (4) 
  Hydrogen 
  and 
  carbon 
  dioxide 
  were 
  also 
  examined, 
  and 
  

   the 
  same 
  law 
  of 
  recombination 
  was 
  found 
  to 
  hold 
  true 
  

   as 
  for 
  air. 
  

  

  (5) 
  On 
  determining 
  the 
  coefficient 
  for 
  carbon 
  dioxide, 
  it 
  

   proved 
  to 
  be 
  practically 
  the 
  same 
  as 
  for 
  air, 
  while 
  the 
  

   coefficient 
  for 
  hydrogen 
  is 
  only 
  about 
  87 
  per 
  cent, 
  of 
  

   the 
  value 
  for 
  air. 
  

  

  In 
  conclusion, 
  1 
  wish 
  to 
  express 
  my 
  sincerest 
  thanks 
  to 
  

   Prof. 
  Rutherford, 
  at 
  whose 
  suggestion 
  this 
  research 
  was 
  

   undertaken, 
  and 
  who 
  has 
  so 
  kindly 
  rendered 
  me 
  the 
  most 
  

   valuable 
  assistance 
  by 
  his 
  advice 
  and 
  suggestions 
  throughout 
  

   the 
  whole 
  investigation. 
  

  

  Macdonald 
  Physical 
  Laboratory, 
  

   McGill 
  College, 
  Montreal, 
  

   July 
  4, 
  1901. 
  

  

  XXXI. 
  Condensation 
  of 
  the 
  Vapours 
  of 
  Organic 
  Liquids 
  in 
  

   Presence 
  of 
  Bust-free 
  Air. 
  By 
  F. 
  Gr. 
  Donxan, 
  M.A., 
  

   Pli.B* 
  

  

  [Plate 
  V.] 
  

  

  § 
  1. 
  Introduction. 
  

  

  THE 
  question 
  why 
  some 
  liquids 
  act 
  as 
  ionizing 
  solvents 
  

   while 
  others 
  do 
  not, 
  is 
  one 
  of 
  fundamental 
  importance 
  

   in 
  the 
  theory 
  of 
  electrolytic 
  dissociation, 
  yet, 
  although 
  various 
  

   suggestions 
  have 
  been 
  made, 
  no 
  satisfactory 
  explanation 
  of 
  

   these 
  differences 
  has 
  hitherto 
  been 
  given. 
  The 
  experiments 
  

  

  * 
  Communicated 
  by 
  the 
  Author. 
  

   Phil. 
  Mag. 
  S. 
  6. 
  Vol. 
  3. 
  No. 
  15. 
  March 
  1902, 
  X 
  

  

  