form of a plaster, p

canaden's is, Canada or hemlock pitch, a resinous exudation from the hemlock Tsuga can a dens is; sometimes employed as a substitute for p. burgundica. p. carbo'nis, p. lithanthracis (N.F.). p. carbo'nis praepara'ta a shallow ve el for one hour at 120° F. used in the preparation of liquor pic is carbon is (Br.). p. liq'uida (U.S., Br.), tar, obtained by the destructive distillation of the wood of Pinus palustris and other species of pine; employed internally as an expectorant, in doses of gr. 1-3 (0.06- 0.2), and externally in the treatment of various skin diseases, p. lith an'thracis (N.F.), p. carbon is, coal-tar, a side product in the manufacture of illuminating gas, a very dark semisolid of characteristic odor.