232 
ON JUNIPERUS VIRGINIANA. 
put in a test glass, and a strong solution of carbonate of po- 
tassa poured upon it; this partially dissolved it, and changed 
its color brown; sulphuric acid was then added until effer- 
vescence ceased: when neutral, the solution was nearly trans- 
parent, but upon the addition of a slight excess of sulphuric 
acid, a precipitate was reproduced. 
Another portion of the liquid was raised to the boiling 
point and set aside; while cooling, an ash-colored substance 
coagulated at the upper surface, but when it became cold, or 
of the same temperature of the room, which was about sixty 
degrees, it gradually precipitated in flaky masses. This pre- 
cipitate was also soluble in a strong solution of carbonate of 
potassa, and was precipitated again by an excess of sulphuric 
acid, proving vegetable albumen a constituent. 
4. An infusion was made by pouring a pint of boiling wa- 
ter upon two ounces of the fresh leaves, and macerating in a 
covered vessel for six hours. When filtered it was of a light 
greenish-yellow color, and partook of the taste of the leaves 
in a slight degree. 
To a portion of this infusion a small quantity of a solution 
of nitrate of silver was added, when, upon standing, a copious 
precipitate of a dark brown color ensued. A solution of 
protochloride of tin also produced a flocculent precipitate, de- 
noting bitter extractive. 
5. A tincture was prepared by macerating half an ounce of 
the leaves in four ounces of absolute alcohol for a week. At 
the end of this time it assumed a bright green color, and par- 
took strongly of the taste of the leaves. Upon the addition 
of water it instantly assumed a milky appearance, and in the 
course of half an hour a greenish substance was precipitated; 
this was collected upon a filter and dried; when heated, it 
melted, and disengaged fumes, which possessed but little, if 
any, of the odor of the leaves. 
An extract prepared from this tincture was translucent, 
resinous, and of a bright green color; this also disengaged 
fumes when heated, leaving a brown powder, which was 
changed to green by the addition of aqua ammonia. This 
