﻿400 
  

  

  J. 
  H. 
  Pratt 
  — 
  Double 
  Halides 
  of 
  Cwsium, 
  

  

  

  A. 
  

  

  

  

  

  Calculated 
  for 
  

  

  

  i. 
  

  

  ii. 
  

  

  B. 
  

  

  C. 
  

  

  Cs 
  2 
  TlCl 
  5 
  .H 
  2 
  

  

  Caesium 
  

  

  40-03 
  

  

  39-84 
  

  

  40-30 
  

  

  39-85 
  

  

  39-97 
  

  

  Thallium. 
  __ 
  

  

  30-75 
  

  

  30-71 
  

  

  31-11 
  

  

  30-98 
  

  

  30-65 
  

  

  Chlorine 
  

  

  26-85 
  

  

  

  26-56 
  

  

  26-93 
  

  

  26-67 
  

  

  Water 
  

  

  

  

  2-88 
  

  

  2-37 
  

  

  2-71 
  

  

  Calculated 
  for 
  

  

  

  

  A. 
  

  

  B. 
  

  

  

  Rb 
  2 
  TlCl 
  5 
  . 
  H 
  2 
  

  

  Rubidium 
  .. 
  

  

  

  . 
  29-09 
  

  

  28-97 
  

  

  29'97 
  

  

  Thallium 
  .... 
  

  

  

  . 
  35-94 
  

   30-74 
  

  

  35-74 
  

   30-97 
  

  

  35-76 
  

  

  Chlorine 
  

  

  

  31-11 
  

  

  Water 
  

  

  

  . 
  3-34 
  

  

  

  

  3-16 
  

  

  

  The 
  crystals 
  of 
  Cs 
  2 
  TlCl 
  5 
  were 
  in 
  needles 
  too 
  small 
  for 
  meas- 
  

   urement. 
  

  

  1 
  The 
  crystallization 
  of 
  

  

  Cs 
  2 
  TlCl 
  5 
  .H 
  2 
  and 
  Kb 
  2 
  - 
  

   T10l 
  5 
  . 
  H 
  2 
  is 
  orthorhom- 
  

   bic. 
  The 
  salts 
  are 
  similar 
  

   in 
  habit 
  and 
  are 
  devel- 
  

   oped 
  as 
  in 
  figs. 
  1 
  and 
  2. 
  

   The 
  forms 
  observed 
  are 
  

   as 
  follows: 
  

  

  772 
  

  

  Til 
  

  

  a, 
  

  

  100 
  

   110 
  

  

  d. 
  

  

  on 
  

  

  102 
  

  

  The 
  crystals 
  of 
  the 
  caesium 
  salt 
  were 
  only 
  about 
  -4 
  to 
  *6 
  mm 
  in 
  

   length, 
  but 
  the 
  faces 
  were 
  smooth 
  and 
  gave 
  good 
  reflections 
  on 
  

   the 
  goniometer. 
  The 
  axial 
  ratio 
  is, 
  

  

  dib:c 
  = 
  0-6762:1 
  : 
  0-6954. 
  

   Measured. 
  

   *70° 
  

   *68 
  22' 
  

   34 
  3 
  30 
  /y 
  

   62 
  51 
  

  

  d 
  a. 
  d, 
  011^011 
  

   m^m, 
  110/^110 
  

   m^ 
  a, 
  110/slOO 
  

   a 
  /s 
  e, 
  100 
  /s 
  102 
  

   m^ 
  d, 
  110^011 
  

   d 
  s^e, 
  011/O02 
  

   e 
  <\ 
  e, 
  102^102 
  

  

  71° 
  14'; 
  71' 
  

  

  43 
  c 
  

   54 
  

  

  9' 
  

   6 
  

  

  Calculated 
  

  

  34 
  c 
  

  

  11' 
  

  

  62 
  

  

  44 
  

  

  71 
  

  

  12 
  

  

  43 
  

  

  16 
  

  

  54 
  

  

  32 
  

  

  Crystals 
  of 
  the 
  rubidium 
  salt 
  were 
  obtained 
  from 
  about 
  1*5 
  

   to 
  4 
  mm 
  in 
  length. 
  The 
  axial 
  ratio 
  is, 
  

  

  d:b:c= 
  0*6792 
  : 
  1 
  : 
  0*7002. 
  

  

  

  Measured. 
  

  

  Calculated. 
  

  

  d 
  y^d, 
  Oll^Oll 
  

  

  *69° 
  36' 
  

  

  

  m/^m, 
  il0/\110 
  

  

  *68 
  7£ 
  

  

  • 
  

  

  m^ 
  a, 
  110^100 
  

  

  34° 
  4'; 
  34° 
  9'; 
  34° 
  5' 
  

  

  34° 
  4' 
  

  

  a 
  /s 
  e, 
  100^102 
  

  

  62° 
  52|' 
  

  

  62 
  49 
  

  

  m/s 
  d, 
  110^011 
  

  

  71° 
  26'; 
  71° 
  23' 
  

  

  71 
  21 
  

  

  d 
  ^ 
  e, 
  011 
  /si 
  02 
  

  

  43° 
  19' 
  

  

  43 
  4* 
  

  

  e 
  ^ 
  e, 
  102^102 
  

  

  54 
  15 
  

  

  54 
  22 
  

  

  