= es eit oe 
:" 
ge ee 
Pe eh eS tee en, Pe ts) AR, alee a) ss ee Sete Se nee | Pee ee BES ae Se ee er eee eee sek TT, Ge, Bee eS 
CELASTRINEZE. 349 
its inner surface is almost white when fresh, but when dry of a 
_ palecinnamon colour. The taste is astringent; ferric chloride 
_, Stains it a dirty green. 
Chemical composition.—The tincture of the bark of H. 
crenulatus is of an olive-green colour, and produces a turbidity 
when poured into water. The tincture evaporated to dryness 
and treated with water, gives a soluble portion containing 
tannin, a sugar, but no alkaloidal body. It precipitates with 
- ferric Bhioside dirty green, and with gelatine and plumbie 
acetate, but. not with iodine or potassio-mercuric iodide. 
This extract evaporated to dryness affords white transparent 
_ rhombic crystals. The resinous portion insoluble in water is — 
' ofa green colour, tasteless, and amorphous, soluble in ether, 
but imperfectly so in alkalies and alkaline carbonates. The 
aqueous solution contains gum, and when evaporated is highly 
_ crystalline, probably from the presence of mannite, or other 
_ Saccharine substance. 
The bark of FE. pendulus is, in composition, very ee like 
that of E. crenulatus. The young bark gives a green tincture | 
with spirit, and the older bark a red tincture ; in each case on 
dissipating most of the alcohol and treating with water a green- 
ish yellow resinous substance falls, and a bright red liquid 
remains. The resins are soluble in ether and partly in alkalies, 
and the red astringent supernatant liquor consists of tannin, 
_ giving a murky green colour with ferric chloride, and a quan- 
_ tity of saccharine matter. No bitterness was perceived in the 
extract, and nothing alkaloidal was detected. The aqueous 
_ extract of the drug, after exhaustion with spirit, contained a 
_ large quantity of a white, neutral crystalline body, which was 
_ dissolved by hot alcohol and crystallised out on cooling. The 
bark had no marked smell or taste, and afforded a light buff- 
_ Coloured powder. The powder treated directly with rectified 
Spirit gave 45°5 per cent. of extract, and when burnt left 12:8 
_ per cent. of carbonated ash. 
