TULIP TREE... ._.. 144 
‘The bark of the Tulip tree has. a eared bitter 
taste and a strong aromatic. pungency. The lat- 
ter property appears to reside in a volatile oil, 
When the bark is distilled with water, it fills the 
apartment with its fragrant odour, yet the product 
of the distillation, at least when the process is con- 
ducted in the small way with the luting of the ap- 
paratus not perfeetly tight, has scarcely any taste 
or smell. Dr. Rogers informs us that he obtain. 
ed an oily matter in the form of a whitish scum 
on the surface of the water in the receiver. A 
bitter resin exists in small quantities in the bark. 
Water dissolyes. a mucous substance, which is 
precipitated in a flocculent form by alcohol. . Wa- 
ter is also impregnated with the bitterness, and, 
if too much heat be not employed, with some of 
the aroma of the tree. ‘The sulphate of iron pro- 
duced a dark brown colour, but.a solution of isin- 
glass did not increase the chemical evidence of 
astringency, producing a barely perceptible effect. 
Aleohol and proof spirit may be considered the 
most perfect solvents of the active ingredients of 
this article, although water dissolves <astigeis to 
produce. its medicinal effeet._ 
_ The bark both of sicinaht and. ledenalbes acts 
on the system as a stimulating tonic and diapho- 
retic, having properties resembling the Cascarilla 
