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  Intelligence. 
  

  

  at 
  its 
  upper 
  end 
  so 
  that 
  it 
  can 
  be 
  attached 
  to 
  the 
  condenser 
  

   directly. 
  The 
  hydrate 
  is 
  added 
  in 
  small 
  quantities 
  at 
  a 
  time, 
  the 
  

   mixture 
  being 
  kept 
  cool 
  during 
  the 
  action. 
  The 
  flask 
  is 
  heated 
  

   for 
  several 
  hours 
  in 
  a 
  glycerin 
  bath 
  at 
  110°-120° 
  and 
  the 
  con- 
  

   tents 
  are 
  then 
  distilled 
  under 
  a 
  pressure 
  of 
  150-100 
  mm 
  , 
  the 
  appa- 
  

   ratus 
  being 
  filled 
  with 
  dry 
  hydrogen 
  to 
  prevent 
  oxidation. 
  The 
  

   base, 
  which 
  collects 
  in 
  the 
  cooled 
  receiver, 
  still 
  contains 
  3 
  or 
  4 
  

   per 
  cent 
  of 
  water, 
  from 
  which 
  it 
  is 
  freed 
  by 
  re-distillation 
  with 
  

   barium 
  oxide. 
  The 
  free 
  hydrazine 
  fuses 
  at 
  1*4° 
  ; 
  though 
  the 
  

   liquid 
  can 
  be 
  cooled 
  several 
  degrees 
  lower 
  before 
  it 
  freezes. 
  Its 
  

   boiling 
  point, 
  taken 
  in 
  dry 
  hydrogen, 
  is 
  56° 
  at 
  7l 
  mm 
  , 
  113'5° 
  at 
  

   761-5 
  1 
  ™ 
  and 
  134-6° 
  at 
  1490 
  ra;i1 
  pressure. 
  Its 
  specific 
  gravity 
  at 
  

   15° 
  is 
  1*014; 
  about 
  the 
  same 
  as 
  that 
  of 
  the 
  hydrate. 
  In 
  solubil- 
  

   ity 
  hydrazine 
  resembles 
  both 
  water 
  and 
  hydroxylamine. 
  It 
  is 
  

   miscible 
  in 
  all 
  proportions 
  with 
  methyl, 
  ethyl, 
  propyl, 
  isobutyl 
  

   and 
  amyl 
  alcohols. 
  It 
  combines 
  with 
  sodium 
  chloride 
  apparently, 
  

   a 
  considerable 
  amount 
  of 
  heat 
  being 
  produced 
  when 
  these 
  sub- 
  

   stances 
  are 
  mixed. 
  They 
  solidify 
  to 
  a 
  crystalline 
  mass 
  on 
  cool- 
  

   ing. 
  The 
  base 
  may 
  be 
  heated 
  to 
  300°-350° 
  without 
  perceptibly 
  

   decomposing 
  ; 
  a 
  portion 
  remaining 
  unchanged 
  even 
  after 
  being 
  

   heated 
  for 
  an 
  hour 
  to 
  the 
  boiling 
  point 
  of 
  sulphur. 
  The 
  critical 
  

   temperature 
  of 
  hydrazine 
  is 
  380°. 
  Its 
  stability 
  at 
  high 
  tempera- 
  

   tures 
  depends 
  on 
  the 
  pressure, 
  the 
  decomposition 
  at 
  first 
  being 
  

   (N 
  2 
  H 
  4 
  ) 
  2 
  = 
  N 
  2 
  + 
  H 
  3 
  + 
  (NH 
  3 
  ) 
  2 
  but 
  subsequently 
  changing 
  to 
  

   (N 
  2 
  HJ 
  3 
  = 
  N 
  2 
  +(NH 
  3 
  ) 
  4 
  . 
  Hydrazine 
  is 
  a 
  strong 
  reducing 
  agent, 
  

   readily 
  bursts 
  into 
  flame 
  in 
  chlorine 
  and 
  reacts 
  violently 
  with 
  

   bromine 
  and 
  iodine. 
  It 
  is 
  slowly 
  oxidized 
  in 
  dry 
  air 
  and 
  in 
  oxy- 
  

   gen; 
  the 
  temperature 
  in 
  the 
  latter 
  case 
  rising 
  to 
  100°. 
  Sodium 
  

   acts 
  on 
  this 
  base 
  when 
  suspended 
  in 
  light 
  petroleum 
  yielding 
  

   hydrogen, 
  ammonia, 
  and 
  a 
  brown, 
  solid 
  substance. 
  — 
  Rec. 
  Trav. 
  

   Chim., 
  xv, 
  174; 
  J. 
  Chem. 
  JSoc. 
  y 
  lxxii, 
  22, 
  Jan., 
  1897. 
  g. 
  f. 
  b. 
  

  

  3. 
  On 
  Nitrogen 
  Pentasulphide. 
  — 
  Nitrogen 
  pentasulphide 
  N 
  2 
  S 
  5 
  

   has 
  been 
  obtained 
  by 
  Muthmann 
  and 
  Clever 
  by 
  heating 
  the 
  

   nitrogen 
  sulphide 
  N 
  4 
  S 
  4 
  with 
  pure 
  carbon 
  disulphide 
  for 
  two 
  hours 
  

   at 
  100° 
  under 
  a 
  pressure 
  of- 
  five 
  atmospheres. 
  A 
  deep 
  red 
  solu- 
  

   tion 
  containing 
  a 
  yellowish-brown, 
  amorphous 
  precipitate 
  is 
  thus 
  

   obtained, 
  which 
  is 
  filtered 
  and 
  the 
  filtrate 
  distilled 
  until 
  most 
  of 
  

   the 
  carbon 
  disulphide 
  is 
  removed. 
  The 
  residue 
  is 
  then 
  allowed 
  

   to 
  evaporate 
  in 
  a 
  vacuum 
  at 
  the 
  ordinary 
  temperature. 
  A 
  red, 
  

   oily 
  product 
  results, 
  which 
  consists 
  of 
  a 
  mixture 
  of 
  the 
  pentasul- 
  

   phide 
  with 
  sulphur. 
  This 
  is 
  treated 
  with 
  dry 
  ether 
  to 
  remove 
  

   the 
  pentasulphide, 
  the 
  last 
  traces 
  of 
  sulphur 
  being 
  crystallized 
  

   out 
  by 
  means 
  of 
  a 
  freezing 
  mixture. 
  The 
  ether 
  is 
  allowed 
  to 
  

   evaporate, 
  the 
  last 
  traces 
  being 
  removed 
  over 
  calcium 
  chloride. 
  

   After 
  filtering, 
  the 
  red 
  oil, 
  if 
  pure, 
  crystallizes 
  from 
  a 
  well-cooled 
  

   etherial 
  solution 
  in 
  tablets 
  resembling 
  iodine. 
  The 
  molecular 
  

   mass 
  determined 
  cryoscopically, 
  using 
  benzene 
  as 
  the 
  solvent, 
  

   gave 
  the 
  formula 
  N 
  2 
  S 
  ft 
  . 
  The 
  amorphous 
  bye-product 
  already 
  

   mentioned 
  gave 
  the 
  formula 
  C 
  3 
  N 
  3 
  S 
  3 
  . 
  It 
  is 
  a 
  fine 
  yellow 
  powder, 
  

   is 
  extremely 
  hygroscopic 
  and 
  retains 
  strongly 
  traces 
  of 
  carbon 
  

  

  