﻿of 
  Pressure 
  ivl 
  rich 
  accompany 
  Point 
  Discharge. 
  

  

  39 
  

  

  with 
  much, 
  longer 
  periods 
  of 
  discharge, 
  the 
  new 
  apparatus 
  

   will 
  enable 
  us 
  to 
  work. 
  

  

  Nitrogen 
  in 
  Hydrogen. 
  

  

  In 
  Curves 
  YI. 
  (dots) 
  are 
  given 
  the 
  results 
  of 
  the 
  first 
  

   nitrogen 
  series 
  referred 
  to 
  above. 
  It 
  followed 
  directly 
  upon 
  

   the 
  first 
  oxygen 
  series, 
  the 
  platinum 
  point 
  having 
  been 
  left 
  

   untouched, 
  in 
  order 
  that 
  the 
  geometrical 
  conditions 
  might 
  be 
  

   identical 
  in 
  the 
  two 
  cases. 
  

  

  The 
  nitrogen 
  was 
  made 
  from 
  urea, 
  and 
  after 
  bubbling 
  

   through 
  caustic 
  potash 
  and 
  strong 
  sulphuric 
  acid 
  was 
  collected 
  

   over 
  the 
  latter. 
  

  

  Curves 
  VI. 
  — 
  Nitrogen 
  in 
  Hydrogen. 
  

  

  '9 
  ife 
  1% 
  £"~ 
  I* 
  % 
  Hit. 
  

  

  It 
  has 
  been 
  shown 
  by 
  de 
  Hemptinne 
  * 
  that 
  point 
  discharge 
  

   through 
  hydrogen 
  and 
  nitrogen 
  mixed 
  in 
  combining 
  pro- 
  

   portions 
  at 
  a 
  pressure 
  of 
  4 
  cm. 
  results 
  in 
  the 
  formation 
  of 
  

   ammonia. 
  Now 
  ammonia 
  formed 
  from 
  gaseous 
  hydrogen 
  and 
  

   nitrogen 
  involves 
  a 
  greater 
  gas 
  contraction 
  per 
  atom 
  of 
  

   hydrogen 
  than 
  does 
  water-vapour 
  from 
  hydrogen 
  and 
  oxygen. 
  

   For 
  this 
  reason, 
  in 
  preparing 
  the 
  apparatus 
  for 
  the 
  first 
  set 
  

   of 
  experiments 
  with 
  nitrogen, 
  we 
  contented 
  ourselves 
  with 
  

   pumping 
  out 
  and 
  refilling 
  with 
  pure 
  hydrogen 
  until 
  the 
  

   amount 
  of 
  oxygen 
  left 
  from 
  the 
  previous 
  set 
  was 
  several 
  

   times 
  less 
  than 
  the 
  smallest 
  amount 
  (0*001 
  per 
  cent.) 
  of 
  

   nitrogen 
  we 
  intended 
  using. 
  It 
  did 
  not 
  seem 
  worth 
  while 
  

  

  * 
  ZeiUf. 
  Phys. 
  Chem. 
  xlvi. 
  p. 
  13 
  (1903). 
  

  

  