90 
UVA URSI, OR BEARBERRY. 
5th. An infusion was made of two oz. Uva Ursi with a 
pint of water. The infusion was precipitated with a solu- 
tion of gelatin, forming tannate of gelatin, and the infusion 
was filtered. To a portion of the filtered liquid a solution 
of subacetate of lead was added ; it produced a dull white 
precipitate. With lime water, a yellow, showing the exist- 
ence of gum. To a second portion of the liquor a few 
drops of protochloride of tin were added, producing a white 
precipitate ; with nitrate of silver a brown one denoting the 
presence of bitter extractive. To a third portion a few drops 
of tincture of muriate of iron were added; it turned black, 
proving the existence of gallic acid. Starch could not be 
detected with tincture of iodine. 
Ashes of Uva Ursi were tested and found to contain pot- 
ash and lime. 
6th. One pound of Uva Ursi was macerated in water 
for twelve hours and displaced until two quarts of liquor 
were obtained. The tannin was precipitated with a solution 
of gelatin, and filtered. The liquor was evaporated to dry- 
ness, the extract remaining dissolved in strong alcohol, and 
treated with purified animal charcoal for twenty-four hours. 
It was then filtered, evaporated, redissolved in absolute al- 
cohol, and treated with purified animal charcoal for twenty- 
four hours; filtered and crystallized by spontaneous evapo- 
ration. The crystals were pressed, redissolved in absolute 
alcohol, treated with animal charcoal, filtered and crystal- 
ized by spontaneous evaporation. This substance crystal- 
lizes in transparent, colourless needle-shaped prisms, soluble 
in alcohol, ether and dilute acid. It will not dissolve in 
essential and fixed oils. Its aqueous solution is precipitated 
by subacetate of lead and carb. potash; lime water, and 
tincture muriate of iron do not affect it. It is neutral to test 
paper, and combustible. One grain acted as a powerful 
diuretic. 
From the experiments here detailed, it may be inferred 
that Uva Ursi contains tannin, gallic acid, gum, resin, bitter 
