118 Dr Daubeny on separating Lime from Magnesia. 
sent alone, or in combination with magnesia ; and this result was 
borne out, not only by comparing the quantities dissolved with 
those recovered, but also by the action of other tests, which 
evinced ithe presence of lime, after the carbonate of ammonia 
had ceased to produce any effect. 
Thus, in one experiment, 10 gr. of pure lime just calcined, 
being treated with muriatic acid, which dissolved it without ef- 
fervescence, and precipitated by carbonate of ammonia, yielded 
only 15.7 gr. of carbonate of lime, or 8.75 of lime. On adding 
oxalate of ammonia, a further precipitation took place. 
In another experiment j 20 gr. of carbonate of lime, treated 
in the same manner, gave a precipitate which amounted to 
17.58 gr. In this instance, by heating the residuum, so as to 
drive off the water, ammoniacal salts, and, lastly, the carbonic 
acid, I obtained a residuum, which answered in all its properties 
to pure lime, weighing about 0.8 gr, which indicates 1.42 of the 
carbonate. 
We have thus accounted for JIths of the original quantity, 
the remaining g^gth probably consisting of water, combined with 
the carbonate of lime. 
In order to assure myself more fully of the correctness of the 
former experiments, I took 10 gr. of carbonate of lime, precipi- 
tated by carbonate of ammonia from muriate of lime, which, had 
itself been procured from a portion of the earth rendered as pure 
as possible. In this instance, there was a nearer approximation to 
the real quantity present than before, for the precipitate amount- 
ed to gr, owing, I believe, to the solution having been set 
aside, after the ammoniacal salt had been added, for twenty-four 
hours, in Order to insure the full operation of the re-agent. 
, It might be troublesome if I were to enter into the details of 
other experiments which I , undertook, always with similar re- 
sults. I shall therefore merely subjoin a list of the proportions 
percent, of the lime originaily employed, which I recovered in 
those instances where I could best depend on the result : 
1. ' From 10 grains of recently burned Lime, - - - 88 
2. 20 Carbonate of Lime, - . - . 85 
3. 20 Carbonate of Lime, with 20 Carbonate of Mag- 
nesia, - - - - - 82.5 
4<. 10 Carbonate of Lime precipitated, from the Muriate 
■with 10 gr. Carbonate of Magnesia, - 9L6 
