162 
the powders, and that only a little viscosity had remained in 
the residuum, which imparted the light blue colour to the- 
water. Three grains, however, of the residuum were dissolved 
in the water, and there remained insoluble in the two -fluids 
three of the twelve grains of pulverized bark which I had origi- 
aby infused. 7 
=. placed other inclve grains of the powders in a cule in- . 
fasion in an ounce of distilled water for forty-eight hours ; it 
was tinged of a dull yellow colour, and the liquor and residuum 
possessed the smell and taste of the bark, though in, a less 
active degree than had been emit rom the diluted alcohol in 
the former operation. With carbonate of potash, the filtered 
infusion was raised to a clear gold colour, but less beautiful 
than the tincture in the alcohol. With sulphate of iron it im- 
mediately became turbid, and formed a greyish precipitate; thus 
manifesting that the bark contains, though in a very small quan- 
tity, gallic acid, or the astringent principle. The water dis- 
solved five grains, and the seven grains of the residuum T in- 
fused i in half an ounce of pure alcohol, which became immediately: 
inged, and in a few hours acquired a gold colour almost equal 
to that of the first infusion in alcohol: when diluted in distilled. 
water, the mixture became turbid, as in the first experiment, 
presenting ‘the fragra nce and bitter taste of the bark. The 
alcoho] dissolved four: grains of camphorous, resinous, colour- 
ing and extractive substance ; and there remained three grains 
of residuum from the twelve grains of bark infused. From these- 
operations the result is, that in both fluids nine parts out of twelve 
are dissolved, and three remain insoluble. 
8. In an ounce and a half of alcohol I infused for three days 
foi -eight oe: of pulverized bark of the Star-reed, and the 
liquor acquired a reddish acire nee we diluted in water, 
