ON KALMIA LATIFOLIA. 
261 
caused a deep brown colour; solution of gelatin, a cloudi- 
ness without precipitate. 
3d. Tinct. of iodine did not detect the presence of starch. 
4th. A cold infusion was made by macerating the leaves 
in water for two weeks. After filtering, it was clear and 
colourless. A portion was heated to 212°, but no coagula- 
tion took place. 
To another portion, a solution of corrosive sublimate was 
added ; it immediately became cloudy, and soon a light 
coloured precipitate took place, which was much accelerated 
by a gentle heat. This precipitate was soluble in a solution 
of carbonate of potassa, but was again precipitated upon the 
addition of sulphuric acid in excess. 
5th. The addition of a solution of nitrate of silver to the 
infusion caused a black precipitate; solution of proto-chloride 
of tin, a dirty white precipitate. 
6th. One ounce of green leaves was digested in 4 oz. of 
absolute alcohol for two days. The tincture, when filtered, 
was of a deep green colour. On the addition of water it 
became cloudy, and upon standing deposited a green resin 
which was insipid, melted by the application of heat, and 
burned with a smoky flame. 
7th. Two ounces of the leaves were digested in half a 
pint of sulphuric ether for two days. The ethereal tincture 
had a bright green colour, and the sweet nauseous taste of 
the leaves. 
On decanting it, a stratum of a light red colour and sy- 
rupy consistence separated, which was removed from the 
supernatant ether. Its taste was very astringent, and it 
afforded a copious yellow precipitate with gelatin, and a 
greenish black one with per-chloride of iron. The colour of 
the precipitate, with the«alts of iron, indicated that the tan- 
nin differed fromHhat which exists in oak bark which affords 
bluish black precipitates with the same salts. 
24* 
