﻿672 
  Mr. 
  C. 
  F. 
  Hogley 
  on 
  the 
  Heavier 
  

  

  of 
  Prof. 
  Richardson 
  *, 
  showing 
  that 
  the 
  positive 
  ionization 
  

   can 
  be 
  greatly 
  renewed 
  in 
  an 
  old 
  wire 
  by 
  the 
  presence 
  o£ 
  

   oxygen, 
  whereas 
  the 
  negative 
  ionization 
  is 
  unaffected. 
  

  

  The 
  author 
  considers 
  the 
  gas 
  theory, 
  also 
  suggested 
  by 
  

   Prof. 
  Richardson 
  f, 
  as 
  promising 
  as 
  any 
  in 
  sight. 
  In 
  order 
  

  

  to 
  agree 
  with 
  his 
  determinations 
  of 
  — 
  he 
  suggests 
  the 
  

  

  possibility 
  of 
  the 
  positive 
  ions 
  being 
  Ng, 
  CO, 
  and 
  O2. 
  

  

  There 
  is 
  no 
  certain 
  proof 
  that 
  these 
  ions 
  might 
  not 
  receive 
  

   their 
  charges 
  from 
  chemical 
  action, 
  which 
  takes 
  place 
  when 
  

   the 
  metal 
  is 
  heated. 
  

  

  It 
  may 
  be 
  possible 
  by 
  studying 
  the 
  products 
  given 
  off 
  by 
  

   a 
  freshly 
  heated 
  body 
  to 
  determine 
  which 
  are 
  the 
  positive 
  

   thermions. 
  One 
  method 
  would 
  be 
  to 
  separate 
  the 
  charged 
  

   particles 
  in 
  sufficient 
  quantity 
  from 
  the 
  uncharged 
  particles 
  

   and 
  to 
  examine 
  the 
  spectrum. 
  Another 
  method 
  would 
  be 
  to 
  

   hunt 
  for 
  those 
  spectral 
  lines 
  which 
  are 
  common 
  to 
  the 
  

   products 
  emitted 
  by 
  all 
  the 
  different 
  thermionic 
  radiators. 
  

   The 
  chief 
  objection 
  that 
  may 
  be 
  urged 
  against 
  the 
  last 
  

   method 
  lies 
  in 
  the 
  fact 
  that 
  most 
  of 
  the 
  metais, 
  as 
  shown 
  by 
  

   Delachanal 
  % 
  give 
  out 
  many 
  gases. 
  

  

  In 
  conclusion 
  I 
  again 
  take 
  this 
  opportunity 
  to 
  express 
  my 
  

   highest 
  regard 
  for 
  the 
  encouragement 
  and 
  help 
  received 
  from 
  

   Prof. 
  0. 
  W. 
  Richardson. 
  

  

  Palmer 
  Phjwsical 
  Laboratory, 
  

   Princeton 
  University. 
  

  

  LXVII. 
  A 
  Search 
  for 
  tlie 
  Heavier 
  Gases 
  of 
  tlie 
  Helium 
  Group 
  

   in 
  Minerals. 
  By 
  C. 
  F. 
  Hogley, 
  A.R.C.Sc, 
  B.Sc, 
  

   Imperial 
  College 
  of 
  Science 
  §. 
  

  

  Pakt 
  I. 
  Argon 
  in 
  Malaco7ie. 
  

  

  UP 
  to 
  the 
  present 
  there 
  has 
  been 
  considerable 
  uncertainty 
  

   as 
  to 
  the 
  amount 
  of 
  argon 
  contained 
  in 
  the 
  mineral 
  mala- 
  

   cone. 
  Several 
  experimenters 
  || 
  have 
  found 
  that 
  the 
  quantity 
  of 
  

   argon 
  is 
  appreciable 
  and 
  in 
  excess 
  of 
  the 
  quantity 
  of 
  helium 
  

  

  * 
  Phil. 
  Trans. 
  Series 
  A, 
  vol. 
  207, 
  p. 
  1 
  (1906). 
  

  

  t 
  Phil. 
  Mag. 
  ser. 
  6, 
  Nov. 
  1908, 
  p. 
  740. 
  

  

  X 
  Scieuce 
  Abstracts, 
  vol. 
  xii. 
  p. 
  249 
  (1909). 
  

  

  § 
  Communicated 
  by 
  the 
  Hon. 
  R. 
  J. 
  Strutt, 
  F.R.S. 
  

  

  II 
  (i.) 
  Von 
  Antropoff, 
  Zeitsch.f. 
  Elelitvoch. 
  1908, 
  vol. 
  xiv. 
  

  

  (ii.) 
  Kitchin 
  & 
  Winterson, 
  Chem. 
  Soc. 
  Trans, 
  vol. 
  Ixxxix. 
  1906, 
  

   p. 
  1570. 
  

  

  