22. THUJA N.F.—ARBOR VITAE. The leafy tops of Thu'ja occidenta'lis Linné, a North American evergreen tree. Small flattened twigs having a scalloped appearance, due to the flat, lateral leaf-scales, each of which has an oilgland near its apex; the other leaves folded lengthwise, boat-shaped, mostly glandless; odor balsamic, somewhat terebinthinate; taste pungently aromatic, camphoraceous, and bitter. The medicinal properties of Thuja depend mainly upon a volatile oil. It resembles savine in its general action. Dose: 15 to 60 gr. (1 to 4 Gm.), in infusion or fl'ext.
A Manual of Organic Materia Medica and Pharmacognosy, 1917, was written by Lucius E. Sayre, B.S. Ph. M.