JVoics on Mineral Waters . 
491 
liity it has for sulphur, are the causes of the successful trials that 
have been made on this subject. Lime and iron , are employed in va- 
rious circumstances in the desulphuration of galena ; the use of 
lime is not very general, and it is impossible to judge of its effects 
from what is known of the properties of the sulphuret of lime. 
The treatment of galena by iron is more in use, and appears more 
advantageous. 
The above memoir will, I hope, suggest several experiments 
to those who are engaged in metallurgical pursuits. 
All the experiments I have detailed were performed in the la* 
boratory belonging to the Council of the Mines, and under the eyes 
of M. Decostils, by whose superior judgment I profited considera* 
bly during the progress of my labours. 
Substances held in solution . 
A general idea of the 1 
quantity of dissolved i 
salts. J 
Uncombined acid in ) 
general. 5 
Sulphuric acid in parti- 
sular. 
Uncombined Alkali. 
Ammonia in particu- 
lar. 3 P3 
Sulphuric acid in sul- ? ^ 
phats. j q 
O 
, , c/D 
•Nitric acid innitrats. 
Motes to aid in the analysis of mineral waters : by the Editor , 
Reagents or Tests. 
A solution of soap in Alcohol. 
Paper dyed blue with Litmus 
slightly alkalized. 
Water (hydrat) of Barytes or 
Stfontian : or by the muriats of 
these earths. 
Blue Litmus paper slightly red- 
dened by a weak acid. 
Nitrat of Mercuty. 
Muriat of Barytes or Strontian 
The deflagration of the nitrats i 
or by the smell on decomposing 
them with sulphuric acid. 
By decomposing them by means 
of sulphuric acid and attending to 
the odour s by nitrat of silver : by 
sulphat of silver where there are 
sulphats also in the solution : by 
mitrat of mercury : also, almost all 
the salts can be separated from the 
sulphats by boiling in strong alco- 
hol, which will not dissolve the 
sulphats. See 2 Hen, ch 20$. 
3 P 
Muriatic acid inmuri- f 
ats. f 
VOL. III. 
