n 7 
called Sydneia or Terra Australis . 
It was then evaporated to dryness, and left a pale brownish 
mass, which was dissolved again, by digestion, in the smallest 
possible quantity of muriatic acid. 
Water was added, in a very large proportion, to this solution, 
without producing any effect ; I then, by prussiate of potash, 
precipitated a quantity of iron, which was separated by a filter. 
The clear solution was then saturated with lixivium of car- 
bonate of potash, and a white precipitate was produced, which 
was collected and edulcorated. This, when digested with di- 
luted sulphuric acid, was dissolved; and the superfluous acid 
being driven off by heat, boiling water was poured on the re- 
siduum, and completely dissolved it. 
To this solution some drops of lixivium of potash were 
added, and, by repeated evaporations, the whole formed crys- 
tals of alum. 
From the above experiment it appeared, that the muriatic 
acid had only dissolved some alumine and iron ; but, in order 
to satisfy myself more completely in respect to the component 
parts of this substance, I made the following analysis. 
Analysis . A. 400 grains were put into a glass retort, which ' 2 & 
was then made red-hot during half an hour. Some water came 
over, and the earth afterwards weighed 380.80 grains, so that 
the loss amounted to iq.20 grains. The greater part of this 
loss was occasioned by the dissipation of the water imbibed by 
the earth ; to which must be added, the loss of weight caused 
by the combustion of a small portion of vegetable matter. 
B. The 380.80 grains were rubbed to a fine powder, and 
being put into a glass retort, 1470 grains of pure concentrated 
sulphuric acid were added. The retort was then placed in a 
small reverberatory, and the fire was gradually increased, till 
