C 9 6 ] 
filtered liquor Subjected to diftillation in B. M. till 
about half came over, which was limpid and of a dis- 
agreeable (lightly aromatic flavour : what remained in 
the retort depofited, on cooling, half a dram of a refi- 
nous fubfiance, perfectly difl'oluble in rectified Spirit oS 
wine : the liquor being then evaporated in B. M. 
left about three drams oS a gummy fubftance intenSely 
bitter and acerb. 
Ob. It Seems to appear from this, that the aqueous 
infuflon contains the aromatic part of the bark, with a 
little of the refmous and aconfiderable quantity of the 
gummy fubftance. 
Experiment II. 
The refiduum of bark, from the former experi- 
ment, after extraction for two hours, in B. M. with 
eight ounces of rectified Spirit of wine, produced a 
tinCture, which, when decompofed with water, left 
three drams and eighteen grains and a half of refinous 
matter. The water that was filtered from it was 
(lightly bitter. 
Ob. The bark therefore Seems to contain three 
Soluble parts, namely, the aromatic part, to be ex- 
tracted by cold watery infufion, a gummy part, 
chiefly difl'oluble in water, and a refinous part diflolved 
plentifully by Spirit of wine. The quantity of dif- 
l'olvcd matter obtained in the above experiments is in 
much greater proportion than in the experiments of 
Mr. Boulduc and Mr. Neumann. Dr. Lewis ob- 
serves, in his notes upon Neumann, that different forts 
of Peruvian bark differ confiderably in their yield of 
extract, which, together with the heatufed in making 
the fpiritous extract, may account for this disparity 
in 
2 
