﻿404 
  J. 
  H. 
  Pratt 
  — 
  Double 
  Halides 
  of 
  Ccesium, 
  etc. 
  

  

  A. 
  

  

  Rubidium 
  10*34 
  

  

  Thallium 
  24-98 
  

  

  Iodine 
  60'38-60'32 
  

  

  Water 
  4-50 
  

  

  

  Calculated 
  for 
  

  

  B. 
  

  

  RbTlI 
  4 
  . 
  2H 
  2 
  

  

  9-78 
  

  

  10-20 
  

  

  25-23 
  

  

  24-47 
  

  

  60-V9 
  

  

  60-94 
  

  

  

  4-32 
  

  

  These 
  salts 
  crystallize 
  in 
  the 
  isometric 
  system, 
  the 
  habit 
  being 
  

   usually 
  the 
  cube 
  truncated 
  by 
  the 
  octahedron. 
  

  

  3:1 
  Sodium 
  and 
  Lithium 
  Thallic 
  Chlorides, 
  JYa 
  z 
  TlCl 
  % 
  . 
  

   12H 
  2 
  and 
  Li 
  3 
  TWl 
  6 
  .8U 
  2 
  0. 
  — 
  Only 
  one 
  type 
  of 
  double 
  salts 
  

   could 
  be 
  obtained 
  with 
  these 
  metals 
  and 
  it 
  does 
  not 
  seem 
  pos- 
  

   sible 
  that 
  others 
  exist, 
  for 
  the 
  ground 
  was 
  covered 
  very 
  care- 
  

   fully 
  and 
  systematically. 
  On 
  account 
  of 
  the 
  extreme 
  solu- 
  

   bility 
  of 
  these 
  salts, 
  especially 
  that 
  of 
  the 
  lithium 
  compound, 
  

   the 
  solutions 
  had 
  to 
  be 
  kept 
  very 
  concentrated, 
  in 
  a 
  more 
  or 
  

   less 
  syrupy 
  condition, 
  which 
  accounts 
  for 
  the 
  high 
  alkali 
  metal 
  

   and 
  low 
  thallium 
  found. 
  These 
  salts 
  are 
  transparent 
  and 
  color- 
  

   less 
  when 
  first 
  taken 
  from 
  the 
  mother-liquor, 
  but, 
  upon 
  expo- 
  

   sure 
  to 
  the 
  air, 
  the 
  sodium 
  salt 
  becomes 
  opaque 
  and 
  the 
  lithium 
  

   compound 
  deliquesces. 
  Analyses 
  of 
  different 
  products 
  gave 
  

   the 
  following 
  results 
  : 
  

  

  A. 
  

  

  Sodium 
  __ 
  11-13 
  

  

  Thallium 
  27*79 
  

  

  Chlorine 
  31-23 
  

  

  Water 
  

  

  Lithium 
  . 
  _ 
  

   Thallium 
  . 
  

   Chlorine 
  _. 
  

   Water 
  

  

  A. 
  

  

  3-71 
  

   34-51 
  

   36*09 
  

   25-14* 
  

  

  B. 
  

   3-79 
  

  

  C. 
  

   3-73 
  

  

  B. 
  

   10-48 
  

   28-39 
  

   30-45 
  

   29-75 
  

  

  D. 
  

   3-' 
  

  

  36-01 
  36-40 
  

  

  36*31 
  

  

  Calculated 
  for 
  

   Na 
  3 
  TlCl 
  6 
  . 
  12H 
  2 
  0. 
  

  

  9-83 
  

   2906 
  

   30-34 
  

  

  30-77 
  

  

  Calculated 
  for 
  

   Li 
  3 
  TlCl 
  6 
  .8H 
  2 
  0. 
  

  

  I 
  3-61 
  

  

  35-06 
  

   36-59 
  

   24-74 
  

  

  On 
  account 
  of 
  the 
  instability 
  of 
  the 
  sodium 
  and 
  lithium 
  

   salts 
  no 
  crystallographic 
  determinations 
  were 
  made. 
  

  

  Repeated 
  attempts 
  to 
  prepare 
  lithium 
  and 
  sodium 
  thallic 
  

   bromides 
  were 
  entirely 
  without 
  success, 
  hence 
  no 
  attempt 
  was 
  

   made 
  to 
  prepare 
  the 
  iodides. 
  

  

  The 
  author 
  wishes 
  to 
  express 
  his 
  indebtedness 
  to 
  Prof. 
  H. 
  L. 
  

   Wells 
  for 
  valuable 
  advice 
  in 
  connection 
  with 
  the 
  chemical 
  part 
  

   of 
  this 
  work, 
  and 
  to 
  Prof. 
  S. 
  L. 
  Penfield 
  for 
  suggestions 
  con- 
  

   cerning 
  the 
  crystallography. 
  

  

  Sheffield 
  Scientific 
  School, 
  December, 
  1894. 
  

  

  *By 
  difference. 
  

  

  