﻿644 
  Palaohe 
  and 
  Graham 
  — 
  Crystallization 
  of 
  Willemite. 
  

  

  similarity 
  with 
  the 
  latter 
  mineral 
  not 
  only 
  in 
  type 
  of 
  symme- 
  

   try 
  but 
  in 
  the 
  actual 
  forms 
  and 
  in 
  their 
  angles. 
  The 
  new 
  axial 
  

   ratio 
  of 
  willemite 
  is 
  almost 
  identical 
  with 
  that 
  of 
  phenacite. 
  

  

  Willemite 
  p 
  = 
  -4453 
  a 
  : 
  c 
  = 
  1 
  : 
  -6679 
  

  

  Phenacite 
  p 
  = 
  -4407 
  a 
  :c= 
  1 
  :*6611 
  

  

  In 
  Table 
  III 
  is 
  given 
  a 
  complete 
  angle-table 
  for 
  willemite, 
  

   calculated 
  for 
  the 
  new 
  axial 
  ratio. 
  The 
  angle 
  cf> 
  given 
  for 
  

   each 
  form 
  is 
  that 
  of 
  the 
  face 
  nearest 
  in 
  azimuth 
  to 
  the 
  right 
  

   hand 
  face 
  of 
  a, 
  taken 
  as 
  zero 
  (see 
  fig. 
  4). 
  There 
  is 
  also 
  added 
  

   a 
  tabulation 
  of* 
  the 
  localities 
  from 
  which 
  crystals 
  have 
  been 
  

   described, 
  the 
  forms 
  found 
  at 
  each 
  place 
  being 
  indicated. 
  

  

  Harvard 
  Mineralogical 
  Laboratory, 
  

  

  Cambridge, 
  Mass., 
  July, 
  1913. 
  

  

  SCIENTIFIC 
  INTELLIGENCE. 
  

  

  I. 
  Chemistry 
  and 
  Physics. 
  

  

  1. 
  The 
  Action 
  of 
  Sulphur 
  Trioxide 
  upon 
  Salts. 
  — 
  Many 
  years 
  

   ago 
  H. 
  Rose 
  observed 
  that 
  dry 
  potassium 
  chloride 
  absorbs 
  the 
  

   vapor 
  of 
  sulphuric 
  anhydride 
  without 
  giving 
  off 
  any 
  gas, 
  forming 
  

   a 
  compound 
  that 
  reacts 
  violently 
  with 
  water. 
  A 
  similar 
  behavior 
  

   of 
  several 
  other 
  salts 
  has 
  been 
  observed 
  by 
  others, 
  but 
  the 
  com- 
  

   pounds 
  formed 
  have 
  not 
  been 
  satisfactorily 
  investigated. 
  W. 
  

   Trattbe 
  has 
  now 
  made 
  a 
  further 
  study 
  of 
  this 
  subject. 
  He 
  found 
  

   that 
  sodium 
  chloride 
  takes 
  up 
  two 
  molecules 
  of 
  sulphuric 
  anhy- 
  

   dride, 
  forming 
  NaC1.2SO 
  s 
  , 
  which 
  from 
  its 
  reactions 
  he 
  showed 
  to 
  

  

  be 
  the 
  sodium 
  salt 
  or 
  chlor-pyrosulphonic 
  acid, 
  O\co 
  2 
  — 
  CI 
  

  

  2 
  * 
  

  

  A 
  corresponding 
  compound 
  was 
  formed 
  with 
  ammonium 
  chloride 
  

   and 
  sulphur 
  trioxide. 
  These 
  compounds 
  react 
  violently 
  with 
  

   water, 
  giving 
  off 
  hydrochloric 
  acid 
  and 
  forming 
  strongly 
  acid 
  

   solutions. 
  With 
  sodium 
  and 
  ammonium 
  fluorides 
  sulphuric 
  anhy- 
  

   dride 
  gave 
  products 
  which 
  were 
  very 
  remarkable 
  from 
  the 
  fact 
  

   that 
  they 
  dissolved 
  in 
  water 
  without 
  producing 
  heat 
  and 
  gave 
  

   almost 
  neutral 
  solutions 
  which 
  reacted 
  neither 
  for 
  fluorides 
  nor 
  

   for 
  sulphates. 
  The 
  compounds 
  were 
  found 
  to 
  be 
  fluorsulphonates, 
  

   NaSO,F 
  and 
  NH^SC^F. 
  When 
  these 
  salts 
  were 
  treated 
  with 
  

   strong 
  sulphuric 
  acid 
  the 
  free 
  fluorsulphonic 
  acid 
  HS0 
  3 
  F 
  could 
  

   be 
  distilled 
  off, 
  and 
  it 
  was 
  found 
  that 
  this 
  acid 
  could 
  be 
  readily 
  

   prepared 
  by 
  passing 
  hydrofluoric 
  acid 
  gas 
  into 
  fuming 
  sulphuric 
  

   acid. 
  — 
  Berichte, 
  xlvi, 
  2513. 
  h. 
  l. 
  w. 
  

  

  