Sulphate of Rhubarb. 385 
Rev, Enc. Aug. 1823. 
21. Sulphate of Rhubarb.—A preparation has been ob- 
tained by A. Nani, a Chemist of Milan which he con- 
- 
by two drams ofacid. | 
The decoction, filtered, pressed and dried, weighed on- 
ly two oz. having lost 4 oz. which remained dissolved in 
the filtered liquor. 4 
To the united decoctions, I added, when cool, in small 
successive portions, three ouncesof quick lime, recently 
pulverized, stirring the mixture frequently with a wooden 
rod, to promote the reciprocal action of the materials. 
* The decoction was of a fine yellow.; and by the addition 
of lime it passed to blood red, communicating the same 
colour to the walnut stick. After one day’s repose, I fil- 
tered off the precipitate and dried it in the sun. It weigh- 
ed six ounces. 1 then added to it four pounds of alcohol 
at 36° and digested it two hours at an elevated tempera- 
ture. The whole wasagain filtered and the residuum sub- 
Uniting the two portions I filtered it through paper, and 
_ distilled it from a retort until about 5 lbs. of alcohol 
passed over. fluid in the retort was then evapo- 
Vor. VII.—No. 2. a: 
