F, 1. Storer on the Carbonates of Lime and Baryta. 41 
Art. V.—On the Behavior of the Carbonates of Lime and of 
Baryla in presence of various Saline Solutions. With remarks 
on the Determination of Carbonic Acid in Mineral Waters ; by 
Frank H. Srorer. 
THE object of the following article is to call attention to the 
very general influence which aqueous solutions of the alkaline 
salts, including those of ammonia, exert in preventing the pre- 
cipitation of the carbonates of lime and of baryta. It will more- 
over be shown that solutions of the hydrates of baryta and of 
lime when diluted with water, or with dilute solutions of the 
caustic alkalies, are no longer precipitated by carbonic acid gas. 
or convenience the latter subject will be first treate E 
current of carbonic acid gas passed through baryta water, 
diluted with two or three times its volume of water, until it was 
completely saturated, afforded no precipitate at any moment 
uring the process, nor was any produced when the excess of 
carbonic nai was driven off by long continued ebullition. The 
solution even regained its strong alkaline reaction and a precipi- 
tate was at once formed in it, on addition of a solution of an 
alkaline carbonate. If a dilute solution of caustic soda, potash, 
ammonia or of lime be added to the baryta water, from which 
the excess of carbonic acid has been driven by boiling, and the 
solution again boiled, a recipitate of carbonate of baryta is pro- 
duced ; this precipitate does not form, however, if a sufficiently 
ute solution of the caustic alkali has been used, unless the so- 
lution be heated, while that formed on addition of a solution of 
an alkaline carbonate falls even in the cold. There is 
Point where less dilute solutions of the caustic alkalies produce 
3 ey in the cold when added to a solution which has 
ed no precipitate on boiling. 
It should f : 
of hydrate of baryta of constant strength, since at different de- 
Precipitate only when heated; in a solution still more diluted no 
loses, in great 
(2.) That a 
