144      ON  THE  SOLUBILITY  OF  SOME  THALLIUM  SALTS. 
Submitted  to  destructive  distillation  the  exudation  yields  an 
acid  water,  empyreumatic  oils  gradually  darkening  in  color,  and  a 
pitchy  residue  which  ultimately  chars  to  a  cinder.  It  contains 
no  cinnamic  acid. 
This  exudation  is  obviously  therefore  a  gum-resin  similar,  for 
instance,  to  that  of  ammoniacum,  and  though  found  on  the  bark 
of  the  tree  yielding  the  black  fluid  Balsam  of  Peru  is  apparently 
quite  distinct  from  the  latter  substance,  the  one  having  no  appa- 
rent relation  to  the  other.- — Pharm.  Journ.  Dec,  1863. 
ON  THE  SOLUBILITY  OF  SOME  THALLIUM  SALTS. 
By  William  Crookes,  F.  R.  S. 
The  following  table  is  the  result  of  many  careful  experiments. 
The  figures  may  be  relied  upon  as  accurate  :— 
One  part  of  Thallium 
Water  at  60< 
'  p. 
Boiling  water. 
Protochloride   dissolves  in 
283-4 
parts. 
52-5  parts 
Sesquichloride 
a 
380-1 
u 
52-9  " 
Iodide 
u 
4453-0 
u 
842  4  " 
Plantinochloride 
<< 
15585-0 
u 
1948-0  " 
Sulphate 
a 
21-1 
U 
5-4  « 
Nitrate 
a 
9-4 
u 
 „  « 
Carbonate 
a 
24-8 
a 
3-6  " 
Oxalate 
a 
69-3 
a 
11-0  " 
Binoxalate 
« 
18-7 
a 
  a 
Phosphate 
a 
201-2 
a 
149-0  " 
Terchromate 
a 
2814-0 
a 
438-7  " 
The  nitrate  and  binoxalate  dissolve  in  considerably  less  than 
their  own  bulk  of  boiling  water,  forming  a  syrupy  solution. 
The  insolubility  of  the  platinochloride  is  remarkable.  It  may 
be  of  interest  to  compare  it  with  the  corresponding  potassium, 
ammonium,  rubidium,  and  caesium  salts  :— 
One  part  of  Water  at  Boiling 
Plantinochloride  of  GOc  F.  water. 
Potassium    dissolves  in         108-  parts,  19-  parts. 
Ammonium        "  150-    "  80-  " 
Rubidium  "  740-    "  157-  " 
Caesium  "  1308-    "  261-  « 
Thallium  "  15585-    "  1948-  « 
Chew.  News,  Jan.,  1864. 
