A bituminous liquid, obtained from the wood of Pinus sylvestris and other pines by destructive distillation, B.P. An empyreumatic oleoresin obtained by the destructive distillation of the wood of Pinus palustris, and of other species of Pinus, U.S.P.

Characters. - Thick, viscid, brownish-black, of a well-known peculiar aromatic odour. Slightly soluble in water, soluble in alcohol, fixed or volatile oils, and in solution of potassa or of soda. Water agitated with it acquires a pale brown colour, sharp empyreumatic taste; and acid reaction.

Composition. - Pyroligneous acid, methyl alcohol, acetic acid, and oily bodies, creasote, with toluene, xylene, and other hydrocarbons.

Dose. - Of tar, 20 minims to 1 drachm, and upwards, made into pills with flour, or given as tar-water in doses of 1-4 fluid ounces.

Preparation.

B.P.

Unguentum Picis liquidae

(tar 5 oz., yellow wax 2 oz.).

U.S.P.

Dose.

Syrupus Picis Liquidae.......................................

1/2 fl. oz.

Unguentum Picis Liquidae

(equal parts of tar and suet).