114 
OM STATICE CAROLINIAN A. 
f 
mixed, filtered and treated with solution of gelatin, in the 
proportion often grains of gelatin to one ounce of water, till 
it ceased to afford a precipitate of tanno-gelatine. This was 
then separated on a filter, washed and dried, when it was 
found to weigh twenty-three grains: equal to 12.4 grains of 
tannic acid. This experiment was repeated, and the same re- 
sult, with a very slight variation, was obtained. 
Experiment Fifth. — A tincture of the root was made by 
subjecting one ounce to two ounces of alcohol for three weeks. 
This was of a dark wine color, and possessed a very astrin- 
gent taste; a precipitate w r as afforded on the addition of water, 
and being evaporated, a dark colored astringent substance was 
left, part of which was soluble and part insoluble in water. 
The insoluble portion being then separated and dried, was 
found to possess the properties of resin, and was dissolved in 
a solution of caustic potassa, from which it was precipitated 
on the addition of an acid? 
Experiment Sixth. — A small portion of the root was dis- 
tilled with sufficient water, in a glass retort, when the liquid 
condensed in the receiver was 'found to possess the odor 
of the root, thereby indicating the presence of a small quantity 
of volatile oil. Owing to the limited quantity of this root 
that could be obtained, I was unable to procure any of the vo- 
latile oil for experiment. 
Experiment Seventh. — An etherial tincture was made, by 
macerating one ounce of the root in two ounces of ether, for 
three weeks. Upon evaporation this yielded a dark-brown, 
very astringent extract, the properties of which were due to 
a portion of tannin dissolved by the water contained in the 
ether: with a view of separating this, it was digested with 
water, when a tough, elastic, sticky substance subsided, which 
was sparingly soluble in ether and the volatile oils. 
It was not readily inflammable, but swelled up on the ap- 
plication of heat ; and when dropped upon a hot iron, rolled 
offin globules, unchanged. I am convinced that this precipi- 
tate was a mixture of tannic acid and caoutchouc. The solu- 
