P. Stro'bus, Pinus Alba, White Pine Bark, N.F. -- The dried inner bark, with not more than 2 p.c. of outer bark and 2 p.c. of foreign organic matter; N. America. Large handsome tree. Bark in flat pieces of variable size, 1-3 Mm. (1/25-1/8') thick, yellowish, brownish, periderm patches, cottony, scattered pits, inner surface finely striate; fracture short; odor slight, terebinthinate; taste slightly mucilaginous, bitter, sweet, astringent. Powder, brownish -- starch grains, calcium oxalate prisms, resin, few tracheids. Dose, 3ss-1 (2-4 Gm.); 1. Syrupus Pini Albae Compositus, 8.5 p.c. Prep.: 1. Syrupus Pini Albae Compositus cum Morphina, morphine sulphate 1/25 p.c. Dose, each, 3ss-1 (2-4 cc.).