﻿Chemistry 
  and 
  Physics. 
  149 
  

  

  the 
  composition 
  HNa 
  o 
  , 
  being 
  formed 
  according 
  to 
  the 
  equation 
  : 
  

   Xa 
  2 
  2 
  + 
  C;H 
  5 
  OH 
  = 
  C 
  2 
  H 
  8 
  ONa 
  -f 
  HNa0 
  2 
  

   The 
  author 
  regards 
  the 
  new 
  substance 
  as 
  the 
  hydrate 
  of 
  sodium 
  

   trioxide, 
  Na 
  2 
  O 
  a 
  ; 
  and 
  therefore 
  gives 
  it 
  a 
  doubled 
  formula, 
  H 
  2 
  Na 
  5 
  

   4 
  . 
  In 
  ice-cold 
  water 
  it 
  dissolves 
  unchanged, 
  but 
  at 
  higher 
  tem- 
  

   peratures 
  the 
  solution 
  slowly 
  evolves 
  oxygen. 
  If 
  alcohol 
  be 
  

   present, 
  the 
  evolution 
  of 
  gas 
  increases 
  and 
  the 
  solution 
  deposits 
  

   crystals 
  of 
  the 
  hydrate 
  of 
  sodium 
  peroxide 
  Na 
  2 
  2 
  (H 
  2 
  0) 
  8 
  , 
  discov- 
  

   ered 
  by 
  Vernon 
  Harcourt. 
  By 
  hydrogen 
  chloride, 
  it 
  is 
  converted 
  

   into 
  sodium 
  chloride, 
  hydrogen 
  peroxide 
  and 
  oxygen 
  gas. 
  In 
  

   preparing 
  this 
  new 
  substance, 
  the 
  author 
  finds 
  12 
  grams 
  sodium 
  

   peroxide 
  and 
  200 
  c.c. 
  of 
  ice-cold 
  absolute 
  alcohol, 
  convenient 
  

   quantities 
  to 
  employ. 
  After 
  shaking 
  them 
  well 
  together, 
  the 
  

   liquid 
  is 
  filtered 
  off, 
  and 
  the 
  white 
  sandy 
  product 
  — 
  separated 
  from 
  

   any 
  undecomposed 
  peroxide 
  — 
  is 
  w 
  T 
  ashed 
  with 
  cold 
  alcohol 
  and 
  

   ether 
  and 
  placed 
  in 
  a 
  desiccator. 
  — 
  Ber. 
  Berl. 
  Chem. 
  Ges., 
  xxvii, 
  

   2297, 
  September, 
  1894. 
  G. 
  f. 
  b. 
  

  

  3. 
  On 
  a 
  pure 
  white 
  Stannic 
  sulphide. 
  — 
  A 
  new 
  form 
  of 
  tin 
  

   disulphide 
  has 
  been 
  prepared 
  b} 
  T 
  Schmidt 
  which 
  is 
  pure 
  white 
  in 
  

   color 
  and 
  which 
  is 
  readily 
  soluble 
  iu 
  ammonium 
  carbonate. 
  To 
  

   prepare 
  it, 
  metallic 
  tin 
  is 
  dissolved 
  in 
  hydrochloric 
  acid, 
  and 
  the 
  

   stannous 
  chloride 
  is 
  converted 
  into 
  stannic 
  chloride 
  by 
  means 
  of 
  

   nitric 
  acid 
  ; 
  the 
  excess 
  of 
  acid 
  being 
  removed 
  by 
  evaporation. 
  After 
  

   dilution, 
  the 
  tin 
  sulphide 
  is 
  thrown 
  down 
  by 
  hydrogen 
  sulphide 
  in 
  

   the 
  ordinary 
  yellow 
  form. 
  It 
  is 
  washed, 
  separated 
  from 
  traces 
  of 
  

   arsenic 
  by 
  solution 
  in 
  hydrogen 
  chloride 
  and 
  reprecipitation, 
  and 
  

   digested 
  with 
  ammonium 
  hydrate 
  in 
  excess 
  for 
  some 
  days. 
  The 
  

   clear 
  solution 
  is 
  neutralized 
  with 
  dilute 
  sulphuric 
  acid, 
  when 
  an 
  

   almost 
  pure 
  white 
  precipitate 
  is 
  obtained. 
  On 
  dissolving 
  this 
  in 
  

   ammonium 
  carbonate 
  and 
  neutralizing 
  with 
  sulphuric 
  acid 
  the 
  

   precipitate 
  is 
  pure 
  white. 
  It 
  is 
  very 
  bulky 
  and 
  is 
  in 
  a 
  different 
  

   state 
  of 
  hydration 
  or 
  of 
  molecular 
  aggregation 
  from 
  ordinary 
  

   stannic 
  sulphide. 
  Upon 
  drying 
  it 
  becomes 
  amber-yellow 
  and 
  is 
  

   nolonger 
  soluble 
  in 
  ammonium 
  carbonate. 
  — 
  JSature, 
  li, 
  85, 
  Novem- 
  

   ber 
  ] 
  894. 
  G. 
  F. 
  B. 
  

  

  4. 
  On 
  the 
  Properties 
  of 
  Liquid 
  Ethane 
  and 
  Propane. 
  — 
  The 
  

   properties 
  of 
  the 
  gaseous 
  hydrocarbons 
  ethane 
  and 
  propane 
  in 
  the 
  

   liquefied 
  condition 
  have 
  been 
  studied 
  by 
  Haixleist 
  in 
  Lothar 
  

   Meyer's 
  laboratory. 
  The 
  propane 
  was 
  obtained 
  pure 
  by 
  the 
  

   process 
  of 
  Kohnlein 
  which 
  consists 
  in 
  heating 
  propyl 
  iodide 
  to 
  

   130° 
  in 
  a 
  sealed 
  tube 
  with 
  aluminum 
  chloride. 
  After 
  twenty 
  

   hours, 
  the 
  tube 
  was 
  allowed 
  to 
  cool 
  and* 
  was 
  afterwards 
  placed 
  in 
  

   a 
  freezing 
  mixture 
  ; 
  it 
  could 
  then 
  be 
  opened 
  without 
  danger 
  and 
  

   the 
  gas 
  be 
  transferred 
  to 
  a 
  gas-holder. 
  It 
  was 
  condensed 
  to 
  a 
  

   liquid 
  in 
  a 
  U-tube 
  surrounded 
  with 
  solid 
  carbon 
  dioxide, 
  and 
  then 
  

   was 
  distilled 
  over 
  into 
  a 
  special 
  boiling 
  point 
  apparatus, 
  which 
  

   consisted 
  of 
  a 
  glass 
  tube 
  closed 
  at 
  the 
  lower 
  end, 
  having 
  a 
  side 
  tube 
  

   by 
  which 
  the 
  gas 
  entered, 
  and 
  provided 
  at 
  top 
  with 
  a 
  stopper 
  

   through 
  which 
  a 
  thermometer 
  and 
  the 
  exit 
  tube 
  passed. 
  Solid 
  

   carbon 
  dioxide 
  surrounded 
  the 
  upper 
  half 
  of 
  this 
  tube 
  and 
  a 
  layer 
  

  

  