﻿312 
  Scientific 
  Intelligence. 
  

  

  after 
  acidification, 
  the 
  salt 
  of 
  hydrazine 
  corresponding 
  to 
  the 
  acid 
  

   employed. 
  In 
  practice 
  the 
  recently 
  prepared 
  compound 
  of 
  nitro- 
  

   gen 
  dioxide 
  and 
  potassium 
  sulphite 
  is 
  suspended 
  in 
  water 
  cooled 
  

   by 
  ice, 
  the 
  whole 
  is 
  placed 
  in 
  a 
  freezing 
  mixture 
  and 
  sodium 
  

   amalgam 
  is 
  gradually 
  added 
  until 
  the 
  liquid 
  is 
  found 
  to 
  reduce 
  

   Fehling's 
  solution 
  strongly 
  and 
  to 
  yield, 
  after 
  being 
  acidified 
  and. 
  

   heated 
  to 
  expel 
  the 
  sulphur 
  dioxide 
  a 
  precipitate 
  of 
  benzalazine 
  

   on 
  the 
  addition 
  of 
  benzaldehyde. 
  The 
  benzalazine 
  thus 
  obtained 
  is 
  

   identical 
  with 
  that 
  described 
  by 
  Curtius, 
  fusing 
  at 
  93° 
  and 
  hav- 
  

   ing 
  the 
  formula 
  (C 
  6 
  H 
  5 
  CHN) 
  2 
  . 
  This 
  substance 
  treated 
  with 
  sul- 
  

   phuric 
  acid 
  yields 
  hydrazine 
  sulphate 
  (N 
  2 
  H 
  4 
  ) 
  2 
  . 
  H 
  2 
  S0 
  4 
  , 
  of 
  melting 
  

   point 
  256°, 
  and 
  otherwise 
  identical 
  with 
  the 
  product 
  obtained 
  

   from 
  organic 
  sources. 
  The 
  reaction 
  appears 
  to 
  take 
  place 
  in 
  two 
  

   stages. 
  In 
  the 
  first 
  

  

  K 
  ^>N.NO 
  + 
  H 
  6 
  = 
  KS 
  g3> 
  N 
  . 
  NH 
  2 
  + 
  H 
  2 
  0-f 
  KOH 
  

  

  Then 
  a 
  subsequent 
  reaction 
  takes 
  place 
  between 
  the 
  alkali 
  and 
  

   the 
  sulphite 
  compound 
  thus 
  

  

  KS 
  H> 
  N 
  • 
  NH 
  * 
  + 
  K0H 
  = 
  K 
  2 
  S 
  ° 
  4 
  + 
  H 
  * 
  N 
  • 
  NH 
  * 
  

  

  — 
  Ber. 
  Berl. 
  C/iem. 
  Ges., 
  xxvii, 
  3498, 
  January, 
  1895. 
  g. 
  f. 
  b. 
  

  

  2. 
  On, 
  the 
  Production 
  of 
  Carbon 
  chlorides 
  at 
  ordinary 
  Tempera- 
  

   tures. 
  — 
  The 
  production 
  of 
  C 
  2 
  C1 
  4 
  and 
  C 
  2 
  C1 
  6 
  by 
  the 
  dissociation 
  of 
  

   carbon 
  tetrachloride 
  at 
  a 
  red 
  heat, 
  with 
  the 
  setting 
  free 
  of 
  

   chlorine 
  is 
  well 
  known. 
  Victor 
  Meyer 
  has 
  now 
  called 
  attention 
  

   to 
  the 
  fact 
  that 
  during 
  the 
  preparation 
  of 
  carbon 
  tetrachloride 
  by 
  

   the 
  chlorination 
  of 
  carbon 
  disulphide 
  at 
  ordinary 
  temperatures, 
  

   these 
  two 
  chlorides 
  are 
  produced. 
  At 
  these 
  works 
  of 
  Muller 
  and 
  

   Dubois, 
  near 
  Mannheim, 
  this 
  process 
  is 
  operated 
  on 
  the 
  large 
  

   scale, 
  at 
  temperatures 
  between 
  20° 
  and 
  40°. 
  After 
  some 
  days, 
  

   the 
  liquid 
  becomes 
  deeply 
  colored 
  owing 
  to 
  the 
  production 
  of 
  

   sulphur 
  dichloride 
  S 
  2 
  C1 
  2 
  . 
  The 
  tetrachloride 
  is 
  then 
  distilled 
  oft 
  

   leaving 
  the 
  chloride 
  of 
  sulphur. 
  On 
  rectification 
  of 
  the 
  tetrachlo- 
  

   ride 
  an 
  oily 
  liquid 
  having 
  a 
  higher 
  boiling 
  point, 
  is 
  obtained. 
  

   Upon 
  fractioning 
  this 
  the 
  author 
  finds 
  that 
  it 
  separates 
  into 
  

   three 
  constituents, 
  CC1 
  4 
  , 
  C 
  2 
  C1 
  4 
  and 
  C 
  2 
  C1 
  6 
  , 
  the 
  last 
  being 
  a 
  solid, 
  

   and 
  being 
  thus 
  obtained 
  in 
  crystals, 
  practically 
  pure. 
  Since 
  the 
  

   carbon 
  disulphide 
  also 
  was 
  practically 
  pure, 
  the 
  author 
  considers 
  

   that 
  the 
  chlorides 
  C 
  2 
  C1 
  4 
  and 
  C 
  2 
  C1 
  6 
  are 
  produced 
  by 
  direct 
  synthesis, 
  

   as 
  follows 
  : 
  

  

  (P8j,+ca 
  1 
  . 
  = 
  o,ca 
  r 
  +(8 
  1 
  cy, 
  

  

  (CS 
  s 
  ) 
  2 
  + 
  Cl 
  e 
  =0,01 
  4 
  + 
  (S,C1,), 
  

  

  — 
  Ber. 
  Berl. 
  Chem. 
  Ges., 
  xxvii, 
  3160, 
  November, 
  1894. 
  g. 
  f. 
  b. 
  

  

  3. 
  On 
  the 
  Atomic 
  masses 
  of 
  Nickel 
  and 
  Cobalt. 
  — 
  In 
  the 
  earlier 
  

   determinations 
  of 
  the 
  atomic 
  masses 
  of 
  nickel 
  and 
  cobalt, 
  made 
  

   by 
  Winkler, 
  he 
  obtained 
  the 
  values 
  58*90 
  for 
  the 
  former 
  metal 
  

   and 
  59-6*7 
  for 
  the 
  latter; 
  the 
  results 
  being 
  secured 
  by 
  analysis 
  of 
  

   the 
  chlorides 
  prepared 
  from 
  electrolytically 
  deposited 
  metals. 
  

  

  