﻿470 
  Wells 
  and 
  Foote 
  — 
  Double 
  Fluorides 
  of 
  

  

  The 
  analyses 
  gave 
  the 
  following 
  results 
  from 
  different 
  crops 
  : 
  

  

  Calculated 
  for 
  

   I. 
  II. 
  Na 
  5 
  Zr 
  2 
  F 
  13 
  . 
  

  

  Na 
  21-15 
  21-09 
  21'23 
  

  

  Zr 
  3363 
  33-55 
  33*22 
  

  

  F* 
  45-22 
  45-36 
  45'57 
  

  

  Salts 
  of 
  Thallium. 
  

  

  TIF. 
  ZrF 
  i 
  . 
  E,0 
  and 
  TIF. 
  ZrF,.— 
  These 
  salts 
  crystallize 
  in 
  

   somewhat 
  concentrated 
  solutions 
  when 
  one 
  part 
  ol 
  thallium 
  

   fluoride 
  is 
  mixed 
  with 
  three 
  or 
  four 
  parts 
  of 
  zirconium 
  fluoride. 
  

   The 
  analyses 
  invariably 
  show 
  an 
  excess 
  of 
  zirconium 
  fluoride. 
  

   The 
  hydrous 
  salt 
  crystallizes 
  in 
  needles, 
  if 
  the 
  solution 
  be 
  

   cooled 
  before 
  precipitation 
  occurs. 
  If 
  the 
  solution 
  is 
  evapo- 
  

   rated 
  until 
  crystals 
  begin 
  to 
  form 
  and 
  then 
  cooled, 
  the 
  anhy- 
  

   drous 
  salt 
  deposits 
  in 
  minute 
  square 
  plates. 
  The 
  salt 
  gives 
  the 
  

   5 
  : 
  3 
  type 
  on 
  recrystallizing. 
  The 
  following 
  results 
  were 
  

   obtained 
  : 
  

  

  

  

  

  Calculated 
  for 
  

  

  

  I. 
  

  

  II. 
  

  

  TlZrF 
  5 
  .H 
  a 
  O. 
  

  

  Tl 
  

  

  ... 
  48-43 
  

  

  47-91 
  

  

  50-05 
  

  

  Zr 
  

  

  ... 
  22-93 
  

  

  23-16 
  

  

  22-15 
  

  

  F 
  

  

  

  23-17 
  

   4-80 
  

  

  23-37 
  

  

  H 
  2 
  0___. 
  

  

  ... 
  3-89 
  

  

  4-43 
  

  

  

  

  

  Calculated 
  for 
  

  

  

  

  

  TlZrF 
  5 
  . 
  

  

  Tl 
  

  

  ... 
  50-16 
  

  

  49-91 
  

  

  52-37 
  

  

  Zr 
  

  

  ... 
  23-86 
  

  

  24-08 
  

  

  23-17 
  

  

  F 
  

  

  

  24-32 
  

  

  24-46 
  

  

  5TIF. 
  3ZrF, 
  . 
  Hfi.— 
  This 
  salt 
  crystallizes 
  in 
  needles 
  when 
  

   from 
  one 
  to 
  three 
  and 
  one-half 
  parts 
  of 
  thallium 
  fluoride 
  are 
  

   added 
  to 
  one 
  part 
  of 
  zirconium 
  fluoride. 
  When 
  about 
  four 
  

   parts 
  of 
  thallium 
  fluoride 
  are 
  added, 
  the 
  same 
  salt 
  crystallizes 
  

   in 
  a 
  different 
  habit, 
  forming 
  prisms 
  of 
  hexagonal 
  outline 
  which 
  

   under 
  the 
  microscope 
  are 
  seen 
  to 
  be 
  twinned, 
  resembling 
  in 
  

   this 
  respect 
  the 
  hexagonal-shaped 
  crystals 
  of 
  aragonite. 
  On 
  

   recrystallizing, 
  both 
  habits 
  give 
  the 
  needle-shaped 
  crystals. 
  

  

  The 
  following 
  analyses 
  were 
  made 
  of 
  the 
  two 
  kinds 
  of 
  crys- 
  

   tals. 
  A 
  rather 
  large 
  number 
  of 
  determinations 
  was 
  made 
  on 
  

   account 
  of 
  the 
  existence 
  of 
  two 
  different 
  forms. 
  

  

  * 
  By 
  difference. 
  

  

  