On Mineral Waters, 481 
four grains of crystallized sulphat of magnesia : for sulphat of 
magnesai contains 33,05 acid, 16,05 magnesia, and 50 water. 
According to the second experiment one pint or lib. of the wa- 
ter, yielded seven grains of dried saline matter : which when fully 
crystallized, would yield nearly as follows t 
Of sulphat of lime (gypsum) 4| grains. 
Of sulphat of potash grains. 
Of muriat of magnesia 1~ grain. 
Of muriat of alumine £ of a grain. 
Hence not only the quantity, but the proportions of the salts in 
these waters, is apt to vary ; owing in great part to the different 
states of decomposition of the amphibole, and other stones, through 
which the waters pass, as well as to the wetness or dryness of the 
season. 
The common pump water of Carlisle furnishes 7 grains to the 
pint of dried saline matter consisting chiefly of sulphat and carbo- 
nat of lime. It is apt for a few days slightly to affect the bowels 
of strangers not accustomed to limestone water. 
The best method of combining the Seltzer water with a laxative 
proportion of the purgative salts is the following ; which will ena- 
ble every body to make at will, a mineral water, impregnated with 
cathartic qualities in any proportion that the palate will bear or 
the bowels will require, combined with the lively, sparkling quali- 
ties of the Seltzer water. Take of supercarbonat of soda, or 
even the common carbonat 20 grains ; of the common carbo- 
nat of magnesia as much, put them in a strong black quart bottle ; 
fill it nearly but not quite full of water ; having previously ready 
a cork that will fit it. Pour in the quantity of strong vitriolic 
(sulphuric) acid, that you know from previous experiment will 
barely neutralize that quantity of saline matter. Cork the bottle, 
and tie down the cork instantly. The carbonic acid gas will thus 
be combined with a solution of glauber’s and epsom salts, which 
may be kept in a cool place. In the same manner the dose may 
be altered or diminished, or sulphat of iron in the proportion of 3 
or 4 grains may be added if the symptoms of the patient require 
it, and a mineral water produced more efficacious than any that 
nature presents to us. T. C 
