﻿930 
  

  

  Dr. 
  J. 
  W. 
  McBain 
  on 
  the 
  Meclianism 
  of 
  the 
  

  

  the 
  ratio 
  between 
  the 
  absorbed 
  and 
  adsorbed 
  hydrogen 
  is 
  

   proportional 
  to 
  the 
  pressure. 
  

  

  It 
  is 
  very 
  important 
  to 
  point 
  out 
  that 
  these 
  experiments 
  

   at 
  a 
  high 
  pressure 
  constitute 
  a 
  direct 
  disproof 
  o£ 
  the 
  funda- 
  

   mental 
  assumption 
  of 
  the 
  clogged 
  diftiision 
  column 
  hypothesis. 
  

   For 
  they 
  show 
  that 
  just 
  the 
  same 
  length 
  of 
  time 
  is 
  taken 
  for 
  

   hydrogen 
  to 
  diffuse 
  at 
  160 
  mm. 
  pressure 
  as 
  is 
  taken 
  at 
  

   20 
  mm. 
  ; 
  whereas 
  Zacharias's 
  hypothesis 
  had 
  predicted 
  that 
  

   it 
  would 
  take 
  sixty-four 
  times 
  as 
  long. 
  

  

  Solubility 
  at 
  Room 
  leniperature. 
  

  

  There 
  is 
  no 
  reason 
  why 
  the 
  methods 
  presented 
  in 
  the 
  

   previous 
  section 
  should 
  not 
  be 
  applied 
  in 
  the 
  demonstration 
  

   and 
  measurement 
  of 
  the 
  solubility 
  of 
  hydrogen 
  in 
  carbon 
  at 
  

   room 
  temperature 
  (compare 
  also 
  page 
  919). 
  Instead 
  of 
  this, 
  

   carbon 
  was 
  exposed 
  to 
  hydrogen 
  for 
  a 
  day 
  at 
  a 
  pressure 
  

   between 
  one 
  or 
  two 
  atmospheres 
  at 
  room 
  temperature. 
  The 
  

   carbon 
  bulb 
  was 
  then 
  quickly 
  plunged 
  into 
  liquid 
  air, 
  and 
  

   experiments 
  of 
  the 
  type 
  of 
  Table 
  VII. 
  were 
  carried 
  out 
  

   with 
  it. 
  The 
  apparatus 
  contained 
  for 
  the 
  first 
  day 
  58*06 
  c. 
  c. 
  

   (corr.) 
  hydrogen. 
  

  

  Table 
  XV. 
  

  

  Remarks. 
  

  

  Time. 
  

  

  Pressure. 
  

  

  Difference. 
  

  

  

  minute. 
  

  

  1200 
  mm. 
  

  

  _ 
  

  

  Cooled 
  ill 
  liquid 
  air 
  

  

  0-1 
  

  

  35 
  

  

  

  

  

  If 
  „ 
  

  

  31 
  

  

  — 
  4 
  mm. 
  

  

  

  5 
  minutes. 
  

  

  23-7 
  „ 
  

  

  -11-3 
  „ 
  

  

  

  29 
  

  

  21-7 
  „ 
  

  

  -13-3 
  „ 
  

  

  ! 
  Removed 
  468 
  c.c. 
  (corr.) 
  ... 
  

  

  31-32 
  

  

  — 
  

  

  

  i 
  

  

  34 
  „ 
  

  

  18-32 
  mm. 
  

  

  

  

  

  36 
  

  

  18-39 
  „ 
  

  

  +0-07 
  mm. 
  

  

  

  38 
  „ 
  

  

  18-38 
  „ 
  

  

  +0 
  06 
  „ 
  

  

  

  56 
  

  

  18-24 
  „ 
  

  

  -0-08 
  „ 
  

  

  

  142 
  

  

  17-41 
  „ 
  

  

  -0-91 
  „ 
  

  

  

  4 
  hours. 
  

  

  16-54 
  „ 
  

  

  -1-78 
  „ 
  

  

  

  5 
  „ 
  

  

  16-35 
  „ 
  

  

  -1-97 
  „ 
  

  

  1 
  

  

  19 
  „ 
  

  

  16-59 
  „ 
  

  

  -1-73 
  „ 
  

  

  The 
  amount 
  of 
  gas 
  which 
  had 
  passed 
  into 
  solution 
  subse- 
  

   quent 
  to 
  the 
  slight 
  removal 
  at 
  31-32 
  minutes 
  is 
  therefore 
  

   .3*5 
  c.c. 
  (corr.). 
  From 
  this 
  the 
  solubility 
  at 
  19 
  mm. 
  would 
  

   be 
  3*9 
  c.c. 
  (corr.). 
  But 
  it 
  was 
  shown 
  (page 
  924) 
  that 
  the 
  

  

  