108 Analyses of the Chrysoberyls from Haddam and Brazil. 
the oxides of manganese and cerium. af hen endeavoured 
to dissolve the compound by the acid sulphate of potash , 
but this method did not succeed... I was not more success- 
ful with the nitric and nitromuriatic acids ; nor could it be 
dissolved by means of boric acid. Berzelius having dis- 
covered columbium in the gangue of the cymophane from 
Haddam, the insoluble residue was tested for the oxide of 
that metal, but all my attempts were fruitless. At length, 
I supposed, that as barytes could be brought into contact 
with this substance more conveniently than potash at a 
high temperature, it might decompose it. With this view, 
a portion of the insoluble matter was exposed to a strong’ 
heat, during one hour with six parts of nitrate of barytes 
in a platina crucible. The calcined mass was boiled in ni- 
tric acid. In this way nearly two-thirds of the matter that 
could not be entirely attacked in any other way. were dis- 
solved. The same treatment was repeated, until nearly 
the whole of it was taken up, which happened after the 
fourth calcination. It was then no further acted on. 
After making numerous experiments on the matter that 
resisted nitrate of barytes and nitric acid, I ascertained, 
that it was not acted on by alkalies nor acids when used 
separately, but after having been previously calcined with 
caustic potash, it readily dissolved in muriatic acid, yield- 
ing.a solution of a pale yellow colour, which gave a red- - 
dish precipitate with an infusion of galls, a deep green pre- 
cipitate with the hydrosulphate of potash, and a white pre- 
cipitate with alkalies. Hence it was oxide of titanium. 
After the barytes was separated with sulphuric acid, the 
nitric solutions were united, and treated with an excess of 
subcarbonate of ammonia. An abundant precipitate ensu- 
ed, which entirely re-dissolved in the excess of subcarbo- 
nate. By ebullition it was again precipitated, and when 
calcined, it was in the form of a light white powder, pos- 
sessing all the properties that characterise Glucina. _ With 
the sulphuric and muriatic acids it formed very sweet as- 
tringent deliquescent salts. By caustic potash it was pre- 
cipitated from its solutions, and the precipitate re-dissolv- 
ed in the excess of the alkali. Klaproth and Arfwedson, 
in their analyses of the Chrysobery! from Brazil, consider- 
ed the insoluble*matter remaining after they had treated 
