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  Intt 
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  SCIENTIFIC 
  IXTELLIGEXCE 
  

  

  I. 
  Cheyistey 
  axe 
  Physics. 
  

  

  Periodic 
  Set 
  ies. 
  — 
  Import- 
  

   krypton 
  i 
  this 
  .Journal, 
  ix. 
  

  

  A, 
  Ladensurg 
  and 
  C. 
  

   ir 
  tbev 
  obtained 
  3 
  liter: 
  

  

  62) 
  h; 
  t 
  1 
  ?eu 
  recently 
  announced 
  b] 
  

   Keuegzl. 
  From 
  550 
  liters 
  oi 
  liquid 
  

   of 
  c" 
  ■"■ 
  tuated 
  residue 
  in 
  two 
  Dewar 
  flasks, 
  which 
  afterwards 
  ool- 
  

   lec 
  :~ 
  in 
  large 
  gasometers, 
  produced 
  230l 
  liters 
  of 
  gas. 
  This 
  

   gas 
  was 
  freed 
  from 
  oxygen 
  by 
  passing 
  ovei 
  i 
  rd-hot 
  | 
  er, 
  and 
  

   the 
  nitrogen 
  was 
  removed 
  from 
  the 
  remaining 
  120 
  liters 
  by 
  the 
  

   metm: 
  1 
  mentioned 
  by 
  Rayleigh 
  and 
  Ramsay 
  for 
  the 
  isolation 
  of 
  

   argon. 
  The 
  last 
  portions 
  of 
  the 
  nitrogen 
  were 
  oxidized 
  by 
  spark- 
  

   ing 
  with 
  surplus 
  oxygen 
  over 
  soda-lye. 
  and 
  the 
  remaining 
  oxygen 
  

   was 
  absorbed 
  by 
  pyrogallol 
  and 
  soda. 
  Three 
  and 
  a-hall 
  liters 
  of 
  

   dried 
  gas 
  were 
  finally 
  obtained, 
  which 
  were 
  condensed 
  in 
  liquid 
  

   a 
  : 
  r 
  to 
  a 
  colorless 
  liquid 
  jontaining 
  a 
  small 
  number 
  of 
  floating 
  

   colorless 
  crystals. 
  By 
  fractional 
  evaporation, 
  between 
  the 
  tem- 
  

   — 
  159" 
  and 
  —147". 
  several 
  residues 
  were 
  obtained. 
  

   owed 
  to 
  be 
  mixtures 
  oi 
  argon 
  and 
  krypton, 
  except 
  the 
  

  

  strong 
  krypton 
  spectrum 
  in 
  which 
  the 
  lines 
  I\ 
  (556i 
  

   green 
  line 
  i55 
  5'lu.a' 
  were 
  brilliant, 
  like 
  hydrogen 
  lines. 
  

   1 
  study 
  oi 
  the 
  spectrum 
  led 
  to 
  the 
  conclusion 
  that 
  the 
  

  

  r 
  was 
  nearly 
  pure 
  krypton 
  containing 
  very 
  little 
  argon 
  ; 
  

   oi 
  its 
  beino- 
  a 
  crystalline 
  bodv 
  also 
  shows 
  that 
  it 
  was 
  

  

  P^ture 
  

   These 
  r 
  

  

  A 
  

  

  not 
  

  

  mixture. 
  The 
  

  

  was 
  

  

  1 
  T 
  "■ 
  ' 
  " 
  U 
  1 
  

  

  :. 
  I 
  in 
  

  

  lithim 
  

  

  m 
  : 
  Nc 
  

  

  *-,-] 
  U 
  1 
  

  

  lally 
  E 
  

  

  y>i,v, 
  

  

  

  tne 
  P, 
  

  

  Ala 
  

  

  -e 
  soda: 
  A< 
  = 
  > 
  

   ore 
  copper. 
  — 
  B> 
  

  

  58*8, 
  and 
  it 
  

   ild 
  t 
  - 
  pis 
  

   ins 
  He 
  i 
  = 
  4 
  

   Kifore 
  potas- 
  

   Acad. 
  Sri. 
  ; 
  

  

  i. 
  A 
  nuc 
  i 
  

  

  that 
  if 
  :. 
  iiiltv 
  

  

  out 
  of 
  ph< 
  

  

  : 
  ed 
  in. 
  afte 
  

  

  is 
  :•' 
  rained, 
  wl 
  

  

  in 
  a 
  the 
  co 
  

  

  suit 
  our. 
  Ana 
  

  

  It 
  

  

  realgar. 
  wn:c. 
  

  

  It 
  was 
  at 
  first 
  

  

  Berzelius. 
  but 
  ' 
  

  

  - 
  Arsenic. 
  — 
  Alexavdee 
  Scott 
  si 
  

   of 
  arsenic 
  acid 
  be 
  mixed 
  with 
  a 
  small 
  

   •ichloride. 
  and 
  later 
  sulphur 
  dioxide 
  be 
  

   length 
  of 
  time 
  a 
  dark 
  brown 
  precipitate 
  

   Ivsis 
  proves 
  to 
  be 
  a 
  sulphide 
  of 
  arsenic 
  

   As, 
  5. 
  This 
  requires 
  12 
  '45 
  per 
  cent 
  of 
  

   inherent 
  samples 
  gave 
  12 
  '7 
  to 
  13*6 
  per 
  

   lue 
  to 
  the 
  difficulty 
  of 
  removing 
  every 
  

   nlphide 
  present. 
  The 
  behavior 
  of 
  this 
  

   sively 
  that 
  it 
  was 
  a 
  definite 
  compound 
  

  

  from 
  the 
  solution, 
  arsenious 
  sulphide 
  h 
  

   jd 
  of 
  excess 
  of 
  hydrochloric 
  acid. 
  Heat 
  

   tbiimes. 
  and 
  arsenic, 
  which 
  

   posed 
  to 
  be 
  identical 
  w 
  

   contains 
  only 
  4*33 
  per 
  cent 
  of 
  

  

  