boullay's filter, etc. 
13 
UvA URSI LEAVES IN COARSE POWDER, 240 PARTS. 
Ext. Soluble. 
Mac. in boiling water, 
Displac't. by alcoh.22° 
" " cold water 
5000 parts gave 48 parts, 
1920 " " 71 " 
2500 " " 46 " 
33 parts. 
15 " 
39 " 
Here we perceive that while displacement by water ap- 
peared to give the least quantity of extract, it in fact gave 
most, 39 out of 46 being perfectly soluble. In some other 
experiments with digitalis and cicuta, joined with purified 
boneblack, I was repaid with extracts in quantity as much as 
one-fourth of the leaves employed, and of superior quality. 
That of the digitalis, particularly, was translucid, brittle, deli- 
quescent, soluble, and withal powerfully active. The liquids 
were richly imbued with the peculiar odors of the plants, and 
in conducting the evaporation, their effects were sensibly felt 
by those remaining in the room. 
That of the cicuta was friable, and appeared to have been 
deteriorated by heat in the reduction. The evaporation of 
the displaced products may be conducted over a spirit lamp, 
until the extract begins to thicken, when it should be removed 
to a water bath. 
These suggested the idea of preparing aqueous extracts, 
concentrated in power, and resembling the essential salts of 
bark and opium in character, or as a substitute for the inspis- 
sated juices of the fresh plants. It is well to mention here 
that the experiments of Messrs. B. confirm the singular fact, 
heretofore announced, that cold water extracts from bark more 
of its soluble principles than hot water. 
Since the adoption of the formula for the preparation of the 
sarsaparilla syrup by alcoholic maceration, it is generally 
adhered to, with the effect of procuring a more valuable syrup 
than heretofore. Whether apothecaries are particular in observ- 
ing the minutiae of direction I cannot say. That part having 
reference to expression and filtration through paper might be 
changed with advantage, by recommending the methode de 
deplacement for obtaining the whole product of the macera- 
tion. If it be required to operate upon as large a quantity 
