﻿416 
  E. 
  A. 
  Hill 
  — 
  Argon, 
  ProiWs 
  Hypothesis, 
  etc. 
  

  

  —3 
  -1 
  — 
  3 
  — 
  1 
  ( 
  — 
  )3 
  — 
  1 
  —3 
  — 
  11 
  — 
  3 
  —1 
  —3 
  — 
  1 
  —^3 
  

  

  3 
  4 
  7 
  \ 
  8/ 
  11 
  12 
  V 
  15/ 
  16 
  19 
  20 
  23 
  24 
  

  

  Al 
  Si 
  P 
  S 
  /Cl\ 
  ? 
  K 
  Ca 
  ? 
  Sc 
  ? 
  Ti 
  V 
  

  

  27* 
  "28 
  31 
  32 
  V 
  36"/ 
  X 
  36 
  3 
  39" 
  * 
  40~ 
  3 
  43" 
  1 
  44~ 
  3 
  47" 
  * 
  48~ 
  3 
  ~51 
  X 
  

  

  Or 
  Mn 
  Pe 
  Co 
  Ni 
  Cu 
  /Zn 
  \ 
  ? 
  /Ga\ 
  ? 
  Ge 
  As 
  

  

  52~ 
  3 
  ~55 
  56 
  59^ 
  60 
  "63 
  1 
  \si) 
  3 
  67" 
  1 
  \Q8j 
  * 
  T\ 
  l 
  Vl* 
  Ts 
  * 
  

  

  76 
  79 
  80 
  " 
  83 
  \84/ 
  87 
  \ 
  88 
  / 
  91 
  92 
  \ 
  95 
  / 
  96' 
  

  

  B 
  ? 
  , 
  ? 
  Ru 
  Ro 
  Pd 
  . 
  Ag 
  ? 
  Cd 
  / 
  In\ 
  ? 
  

  

  3 
  — 
  - 
  1 
  3 
  1 
  3 
  — 
  -1—2-3 
  — 
  1 
  3 
  ( 
  1 
  3 
  

  

  99 
  100 
  103 
  104 
  107 
  108 
  111 
  112 
  \115/ 
  116 
  

  

  ? 
  /Te\ 
  I 
  ? 
  ? 
  Cs- 
  ? 
  /Ba\ 
  

  

  — 
  1 
  ( 
  ) 
  3 
  — 
  - 
  1 
  3 
  — 
  1 
  — 
  3 
  — 
  1 
  ( 
  — 
  ) 
  3 
  

  

  23 
  \ 
  124/ 
  127 
  128 
  131 
  132 
  135 
  \136/ 
  

  

  Sn 
  Sb 
  

  

  119 
  120 
  1 
  

  

  La 
  Ce 
  Di 
  

  

  — 
  1 
  3 
  — 
  , 
  etc. 
  

  

  139 
  140 
  143' 
  

  

  I 
  have, 
  in 
  the 
  main, 
  used 
  the 
  nearest 
  whole 
  numbers, 
  brack- 
  

   eted 
  those 
  values 
  that 
  might 
  seem 
  forced, 
  and 
  inserted 
  a 
  few 
  

   numbers 
  (possible 
  blanks) 
  to 
  complete 
  the 
  series. 
  

  

  There 
  is, 
  I 
  think, 
  some 
  other 
  law 
  or 
  laws 
  besides 
  this 
  simple 
  

   one, 
  effective 
  in 
  the 
  matter, 
  but 
  there 
  are 
  many 
  things 
  justify- 
  

   ing 
  the 
  view 
  that 
  this 
  ideal 
  arithmetical 
  series, 
  which 
  on 
  the 
  

   whole 
  is 
  so 
  closely 
  attained 
  (all 
  things 
  duly 
  considered) 
  

   expresses 
  the 
  chief 
  of 
  perhaps 
  several 
  laws, 
  all 
  jointly 
  effective 
  

   in 
  limiting 
  the 
  mass 
  of 
  the 
  elements. 
  

  

  One 
  of 
  the 
  strongest 
  objections 
  thus 
  far 
  to 
  the 
  use 
  of 
  round 
  

   numbers 
  in 
  such 
  atomic 
  theories, 
  as 
  well 
  as 
  to 
  Prout's 
  hypothe- 
  

   sis 
  in 
  general, 
  has 
  been 
  the 
  irrationality 
  of 
  the 
  ratio 
  of 
  H 
  to 
  0. 
  

   Now 
  Lord 
  Rayleigh 
  has 
  shown 
  that 
  at 
  13° 
  C. 
  water 
  absorbs 
  

   4 
  per 
  cent 
  of 
  its 
  volume 
  of 
  Argon 
  and 
  that 
  gases 
  handled 
  over 
  

   water 
  in 
  the 
  usual 
  way 
  almost 
  invariably 
  become 
  contaminated 
  

   with 
  the 
  Argon 
  held 
  in 
  solution. 
  Moreover, 
  it 
  is 
  quite 
  likely 
  

   that 
  in 
  reactions 
  for 
  the 
  production 
  of 
  gases 
  where 
  water 
  is 
  

   used 
  as 
  a 
  reagent 
  (e. 
  g. 
  evolution 
  of 
  H 
  by 
  electrolysis 
  of 
  water 
  

   or 
  action 
  of 
  dilute 
  acid 
  on 
  Zn), 
  Argon 
  contamination 
  might 
  

   result 
  from 
  the 
  Argon 
  so 
  dissolved, 
  and 
  that 
  such 
  contamina- 
  

   tion 
  once 
  acquired, 
  would 
  not 
  be 
  removed 
  by 
  any 
  ordinary 
  

   reagents 
  through 
  which 
  the 
  gas 
  was 
  passed. 
  A 
  simple 
  calcula- 
  

   tion 
  will 
  show 
  that 
  with 
  hydrogen 
  contaminated 
  by 
  only 
  y^-ths 
  

   of 
  one 
  per 
  cent 
  of 
  Argon, 
  the 
  ratio 
  H 
  to 
  O 
  would 
  be 
  

   reduced 
  from 
  1 
  : 
  16 
  to 
  1 
  : 
  15*879 
  which 
  is 
  about 
  the 
  latest 
  values 
  

   deduced 
  from 
  direct 
  weighings 
  of 
  the 
  two 
  gases. 
  And 
  in 
  those 
  

   determinations 
  based 
  upon 
  the 
  synthesis 
  of 
  water, 
  by 
  passing 
  

   H 
  over 
  red 
  hot 
  oxide 
  of 
  copper, 
  with 
  Argon 
  in 
  the 
  water 
  from 
  

   which 
  the 
  H 
  was 
  evolved 
  and 
  contamination 
  having 
  occurred, 
  

  

  