Oak Bark is an astringent and tonic.
It is _used externally_ in the form of decoction, to restrain bleeding
from lacerated surfaces. As a local astringent, it is used in the
form of decoction, as a gargle in sore throat and relaxed uvula.
It is _used internally_ in the same diseases as catechu, and when
combined with aromatics and bitters, in intermittent fevers.
_Dose_ of the _powder_, from fifteen to thirty grains; of the
_decoction_, from two to eight drachms.