﻿384 
  Scientific 
  Intelligence, 
  

  

  hours. 
  By 
  increasing 
  the 
  current 
  pressure 
  and 
  so 
  the 
  temperature, 
  

   the 
  absorption 
  was 
  diminished. 
  When 
  hydrogen 
  was 
  added 
  to 
  

   the 
  mixture, 
  10 
  per 
  cent 
  of 
  argon 
  was 
  absorbed 
  in 
  24 
  hours, 
  all 
  

   the 
  hydrogen 
  having 
  disappeared. 
  When 
  benzene 
  was 
  thus 
  

   added, 
  the 
  absorption 
  was 
  9 
  per 
  cent. 
  It 
  hence 
  appears 
  that 
  to 
  

   fix 
  a 
  molecule 
  of 
  argon 
  (AJ 
  34 
  molecules 
  of 
  carljon 
  disulphide 
  

   are 
  required 
  (CSJg^. 
  In 
  all 
  cases 
  a 
  solid 
  amorphous, 
  reddish 
  

   polymerized 
  substance 
  is 
  formed 
  ; 
  the 
  polymerization 
  of 
  the 
  

   bisulphide 
  and 
  the 
  combination 
  of 
  hydrogen, 
  of 
  nitrogen 
  or 
  of 
  

   argon 
  proceeding 
  simultaneously. 
  The 
  results 
  obtained 
  lead 
  the 
  

   author 
  to 
  suspect 
  the 
  existence 
  of 
  metallic 
  argonides 
  in 
  those 
  

   minerals 
  which 
  evolve 
  argon 
  under 
  the 
  action 
  of 
  acids, 
  or 
  even 
  of 
  

   hydrogen 
  argonide. 
  In 
  a 
  subsequent 
  communication 
  Berthelot 
  

   gives 
  the 
  results 
  of 
  his 
  experiments 
  on 
  the 
  action 
  of 
  the 
  electric 
  

   discharge 
  on 
  argon 
  mixed 
  in 
  one 
  case 
  with 
  mercury-dimethyl, 
  

   and 
  in 
  the 
  other 
  with 
  mercury-diphenyl. 
  No 
  absorption 
  took 
  

   place 
  in 
  the 
  first 
  case, 
  while 
  in 
  the 
  second, 
  owing 
  to 
  the 
  produc- 
  

   tion 
  of 
  phenylmercurargon, 
  6*5 
  per 
  cent 
  of 
  argon 
  was 
  absorbed 
  

   and 
  the 
  green 
  luminescence 
  was 
  produced. 
  — 
  C. 
  JR., 
  cxxix, 
  '71-84, 
  

   378-9, 
  July, 
  August, 
  1899. 
  g. 
  f. 
  b. 
  

  

  4. 
  On 
  Mercu7'y 
  in 
  the 
  Colloidal 
  Condition. 
  —l^j 
  reducing 
  

   ra^ercurous 
  nitrate 
  with 
  stannous 
  nitrate, 
  adding 
  ammonium 
  citrate 
  

   solution 
  and 
  filtering 
  through 
  an 
  earthenware 
  filter, 
  Lottermoser 
  

   has 
  succeeded 
  in 
  preparing 
  colloidal 
  mercury, 
  which 
  after 
  drying 
  

   is 
  obtained 
  in 
  the 
  form 
  ot 
  brilliant 
  silver-like 
  masses 
  which 
  dis- 
  

   solve 
  in 
  water 
  giving 
  a 
  dark 
  brown 
  solution. 
  If 
  this 
  colloidal 
  

   mercury 
  is 
  treated 
  with 
  dilute 
  chlorine 
  water, 
  mercurous 
  chloride 
  

   is 
  obtained, 
  also 
  in 
  the 
  colloidal 
  state. 
  In 
  the 
  same 
  way 
  the 
  

   bromide 
  and 
  the 
  iodide 
  can 
  be 
  procured 
  as 
  colloids. 
  The 
  colloidal 
  

   iodide 
  appears 
  as 
  a 
  deep 
  red 
  solution 
  from 
  which 
  the 
  iodide 
  is 
  

   rapidly 
  deposited. 
  — 
  -Zjor. 
  6Vi,, 
  Ivii, 
  484-487, 
  1898; 
  Zeitschr. 
  Phys. 
  

   Chem., 
  xxix, 
  174, 
  May, 
  1899. 
  G. 
  f. 
  b. 
  

  

  5. 
  On 
  Lithimn-aonmoniuni 
  and 
  Calcium-amnioniuni 
  and 
  the 
  

   Amides 
  of 
  these 
  3fetals. 
  — 
  It 
  has 
  been 
  observed 
  by 
  Moissan 
  that, 
  

   like 
  potassium 
  and 
  sodium, 
  lithium 
  and 
  calcium 
  dissolve 
  in 
  liquid 
  

   ammonia 
  with 
  a 
  blue 
  color. 
  But 
  while 
  the 
  NaNHg 
  decomposes 
  

   at 
  —20° 
  and 
  KNH.^ 
  at 
  —2°, 
  into 
  metal 
  and 
  ammonia, 
  the 
  lithium 
  

   and 
  calcium 
  compounds 
  are 
  permanent 
  at 
  the 
  ordinary 
  pressure 
  

   and 
  temperature, 
  the 
  LiNHg 
  remaining 
  unchanged 
  up 
  to 
  -f 
  70° 
  

   and 
  the 
  CaNIIg 
  up 
  to 
  -1-20°; 
  these 
  compounds 
  evolving 
  so 
  much 
  

   heat 
  in 
  their 
  formation 
  that 
  in 
  the 
  case 
  of 
  the 
  lithium 
  this 
  metal 
  

   is 
  fused. 
  On 
  spontaneous 
  evaporation 
  as 
  much 
  ammonia 
  becomes 
  

   solid 
  as 
  corresponds 
  to 
  the 
  formula 
  Li(NHg)3. 
  About 
  70°, 
  there 
  

   is 
  formed 
  crystallized 
  Li(NHJ; 
  but 
  by 
  diminishing 
  the 
  pressure, 
  

   this 
  compound 
  decomposes 
  into 
  metallic 
  lithium 
  and 
  ammonia. 
  

   Calcium 
  ammonium 
  corresponds 
  to 
  the 
  formula 
  Ca(NHg)^. 
  Both 
  

   lithium 
  and 
  calcium 
  ammonium 
  ignite 
  spontaneously 
  in 
  the 
  air. 
  

   When 
  instead 
  of 
  liquid 
  ammonia, 
  methylamine 
  is 
  brought 
  in 
  con- 
  

   tact 
  with 
  lithium 
  at 
  —20°, 
  a 
  blue 
  liquid 
  is 
  formed 
  haviag 
  approxi- 
  

   mately 
  the 
  composition 
  Li(Nri2CH3)3. 
  On 
  evaporation 
  in 
  vacuo, 
  

  

  