This section is from the book "Materia Medica Pharmacy, Pharmacology And Therapeutics", by W. Hale White. Also available from Amazon: Materia Medica Pharmacy, Pharmacology And Therapeutics..
The bark of the Quercus alba Linne (nat. ord. Cupuliferae).
North America, westward to Minnesota, Kansas, and Mississippi; in woods.
In nearly flat pieces, deprived of the corky layer, about 5 mm. thick; pale brown; inner surface with short, sharp, longitudinal ridges; tough; of a coarse, fibrous fracture, a faint, tan-like odor, and a strongly astringent taste. As met with in the shops it is usually an irregularly coarse, fibrous powder, which does not tinge the saliva yellow.
Incompatibles. - See Tannic Acid, p. 593.