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ANALYSIS OF MINERAL WATERS. 265 
with diluted muriatic acid, and whether it is entirely dissolved. 
If it is, the precipitate is of course carbonate of barytes, the 
weight of which, when it is dried, gives the quantity of carbo- 
nic acid ; 100 grains containing 22 of acid. If it do not ef 
fervesce, it is sulphate of barytes, the weight of which, in like 
manner, gives the quantity of sulphuric acid ; 100 grains, dried 
at a low red-heat, containing 34 of acid. If it effervesce, and 
is partially dissolved, it consists both of carbonate and sul- 
phate. To ascertain the proportions of these, let the precipi- 
tate be dried at a heat a little inferior to redness, and weigh- 
ed; then submit it to the action of dilute muriatic acid ; after 
this wash it with water, and dry it by a similar heat, its weight 
will give the quantity of sulphate, and the loss of weight, that 
of carbonate of barytes. 
By this operation the carbonic and sulphuric acids are en- 
tirely removed, and the whole salts in the water are converted 
into muriates. It remains, therefore, first to discover and esti- 
mate the quantities of the bases present, and then, to complete 
the analysis, to find the quantity of muriatic acid originally 
contained. 
Add to the clear liquor a saturated solution of oxalate of 
ammonia as long as any turbid appearance is produced. The 
lime will be thrown down in the state of oxalate. The preci- 
pitate being washed, may be dried, but as it cannot be expo- 
sed to a red-heat without decomposition, it can scarcely be 
brought to any uniform state of dryness with sufficient accura- 
cy to admit of the quantity of lime being estimated from its 
weight. It is therefore to be calcined with a low red-heat, by 
which it is ‘converted into carbonate of lime, 100 grains of 
which are equivalent to 56 of lime. But as a portion of car- 
bonic acid may be expelled, if the heat is raised too high, or a 
little water retained if it is not high enough; it is proper to 
Vou. VIIL P. I. pot el convert 
