Chemisiry. 121 
9. The Characteristics of Thallium'—Derived from statements of 
Crookes, Lamy and Bottger, and from original observations —Thallium 
occurs in minute quantities in many native metallic sulphids, especially 
in iron and copper pyrites. Hence it is often found in commercial sul- 
phur, in oil-of-vitricl and in the sediment of the sulphuric acid chambers 
in metallic copper, bismuth and cadmium, and in preparations derived 
from these substances. It likewise occurs in the flue-dust of furnaces and 
in certain mineral springs. 
hydrate (TIO,, HO) is brown and dissolves in chlorhydric, nitric and 
sulphuric acids. At high temperatures it loses its water but retains its 
me ed , . . 
Voluminous. Sulphid of thallium is insoluble in sulphid of ammonium, 
in alkalies, alkaline carbonates and cyanids. It oxydizes to soluble sul- 
ates produce no precipitates in solutions of thallium.— Chlorhydric acid 
throws down from solutions that are not too dilute, protochlorid of thal- 
2 From the Editor’s notes to a new edition of Fresenius’ Qualitative Analysis in 
Preparation, to be published by John Wiley, New Yor 
4s, Jour. Scr.—Seconp Szxms, Vou. XXXVII, No. 109.—Jan., 1864. 
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