g02 Dr. Marcet’s Analysis of the Waters of 
of the luna cornea, after being melted and heated to redness, 
indicated 19,05 parts of acid to 80,95 of oxyd of silver. The 
composition of common salt, calculated from these data, proved 
to be 4b parts of acid to 54 of soda. 
§ III- 
Comparative Analyses of artificial Solutions. 
I shall not enter into all the particulars of the various ana- 
lyses of artificial solutions, resembling the water of the Dead 
Sea, which directed me in the choice of the method which I 
ultimately adopted. But it may be proper to state, in a sum- 
mary manner, the principal means which were tried, and their 
respective defects and advantages. 
These artificial mixtures all contained the three muriats 
above mentioned, but in each of them the small quantity of 
selenite was altogether disregarded. 
1. The first of these solutions was evaporated to dryness, 
and the residue exposed for near an hour to a red heat in a 
pla ina crucible pretty closely covered. The object of this was 
to drive off the acid from the magnesia (muriat of magnesia 
being decomposable by heat), and after separating this earth 
from the other salts by means of distilled water, to precipitate 
the lime by carbonat of ammonia, and to obtain the muriat of 
soda by evaporation to dryness. But 1 soon found that the 
complete decomposition of muriat of magnesia by heat, under 
these circumstances, was extremely difficult, if not impossible, 
and accordingly the results obtained from this method indi- 
cated considerably less magnesia and proportionallymorelime. 
