3h5 
formerly supposed, to be Zeolite , &c. 
diluted with distilled water, and a considerable portion of the 
substance was dissolved by it : the potash and the ammonia had 
dissolved rather more than half of the fixed ingredients of it. 
( 4. ) The edulcorated residuum, which was of a dirty yellow 
colour, was transferred to a crucible of platina, and moistened 
with sulphuric acid, which was abstracted from it, in the sand- 
bath. The brownish-gray mass was elixated with distilled 
water, which dissolved nearly the whole of it. The residuum 
consisted of a white heavy powder, which, tried in different 
ways, was found to be sulphate of lead. 
(5.) The solution effected by sulphuric acid was greenish. 
On evaporation, a salt was produced, of uncommon brilliancy, 
resembling scales of mica, or silver leaf. These diminished in 
quantity at every fresh solution and evaporation, and at last 
they could not be reproduced ; but a confused crystallized mass 
remained. How far the platina crucible may have contributed 
to this phenomenon I cannot ascertain. 
(6.) The solution of the saline mass was precipitated by 
potash, of a dark brown colour. The potash held nothing in 
solution. I redissolved the precipitate in nitric acid, and preci- 
pitated the solution by ammonia, of a bright yellow colour, 
peculiar to the oxide of uranium, with which it agreed in other 
properties. 
(7.) What was dissolved by ammonia (2.) amounted to 
nearly part of the fixed ingredients. It was white, inclining 
to ash-colour. It tinged phosphate of soda and ammonia of a 
light green. It was soluble in sulphuric acid, except a few ge- 
latinous flakes. The solution was greenish ; gradually eva- 
porated, it shot into a number of minute stellated crystallizations, 
which were circular, and consisted of rays diverging from a 
mdcccv. Y y 
