172 On some Reactions of the Salts of Lime and Magnesia, 
presently show, not quite correct. The power of decomposing 
sum appears to belong only to solutions containing monocar- 
bonate of magnesia 
6. When a portion of moist recently precipitated hydro- 
satiate of magnesia is added to a solution of bicarbonate of 
lime, it is immediately dissolved, but the saan solution 
soon becomes turbid from separation of carbonate of lime. A 
similar reaction is produced by carbonate of soda, which precipi- 
tates carbonate of lime from a solution of the bicarbonate. 
7. The preceding experiments show a remarkable degree of 
solubility in recently formed bicarbonate of lime; the liquid in 
§ 4 deposited je eet an amount of carbonate of lime 
equal is 9: 6 ms. per litre; and if we add, as in $2, 0°8 grms. for 
the amount of carbonate remaining in solution, we shall have 
8-4 grms. of carbonate of lime held for a time dissolved as bicar- 
bonate in a litre of saline water, at the ordinary pressure of the 
atmosphere ; the experiment detailed in § 3, indicates a solubility 
at least as great. 
Boutron and ect by treating lime-water with carbonic acid, 
obtained supers urated solutions holding 2°3 grms. of carbonate 
ina litre, but the half of this was soon deposited, and they found 
that a litre of water charged with carbonic acid, under a pres- 
sure of several atmospheres, cannot retain more than 1°16 grms 
of carbonate of lime in permanent solution. We have seen in 
§ 2, that a saline solution retains after some hours exposure, 0°805 
a of carbonate. In other trials I have found 0-838 and 0° 915 
Be iecoun on uae te of magnesia shiny times greater than 
eee by Bischof. In § 1 we have seen that a ne gene ve 
containing at the same time chlorids of sodium and 
- Maay hold dissolyed as bicarbonate 4:19 grms, sPedsbeiile opine 
