_Linimentum Terebinthinae Aceticum (Lin. Terebinth. Acet.), Acetic Turpentine Liniment, N.F._ (Linimentum Album, Stokes' Liniment, St. John Long's Liniment).--Oil of turpentine (40%) and acetic acid (8%) with oil of lemon, fresh egg and rose water. =*Oleum Theobromatis (Ol. Theobrom.), Oil of Theobroma, U.S.P.= (Butter of Cacao, Cacao Butter).--A solid fixed oil. Melts at body temperature. ACTION AND USES: Used principally in suppositories, etc.; sometimes in emollient ointments and as a lubricant in massage. =Oleum Thymi (Ol. Thymi), Oil of Thyme, U.S.P.= (Thyme Oil).--A volatile oil. Nearly insoluble in water; soluble in alcohol. ACTION AND USES: Rubefacient and counterirritant; usually applied as a liniment, diluted with a fixed oil or the well-known soap liniment. Internally, carminative but now seldom used. DOSAGE: 0.2 Cc. or 3 minims (U.S.P.). =*Oleum Tiglii (Ol. Tiglii), Croton Oil, U.S.P.=--A fixed oil. ACTION AND USES: Very powerful cathartic and gastric and intestinal irritant, frequently causing violent vomiting and purging, sometimes followed by collapse. Externally, rubefacient and vesicant. DOSAGE: 0.05 Cc. or 1 minim (U.S.P.). Preferably administered in drop doses on sugar or in a pill with bread or other absorbent. _Collodium Tiglii (Collod. Tiglii), Croton Oil Collodion, N.F._--Croton oil (10%) and flexible collodion. USES: There is no advantage in applying croton oil with collodion. _Linimentum Tiglii (Lin. Tiglii), Liniment of Croton Oil, N.F._ (Linimentum Crotonis).--Croton oil (13%), oil of cajuput, and alcohol. _Linimentum Tiglii Compositum (Lin. Tiglii Co.), Compound Croton Oil Liniment, N.F._--Croton oil, oil of sassafras and oil of turpentine (each 20%) and olive oil. =*Opium (Opium), Opium, U.S.P.=--The dried juice of the opium poppy. Yields not less than 9.5 per cent. of anhydrous morphine. ACTION AND USES: Like those of morphine, but opium is absorbed more slowly, and is generally preferred in the treatment of the gastro-intestinal tract, especially for the purpose of checking diarrhea. It is ineffective for external or local application, because the opium alkaloids are not absorbed to any appreciable extent through the unbroken skin. The routine use of complicated mixtures containing opiates deserves condemnation, since opium should not be prescribed unless it is adapted to the conditions of the individual patient. DOSAGE: 0.06 Gm. or 1 grain (U.S.P.). _Acetum Opii (Acet. Opii), Vinegar of Opium, N.F._--Opium (10%) in diluted acetic acid, flavored with nutmeg and sugar. USES: An obsolete and superfluous preparation. DOSAGE: 0.5 Cc. or 8 minims (U.S.P.). _*Extractum Opii (Ext. Opii), Extract of Opium, U.S.P._ (Powdered Extract of Opium, Opii Extractum, P.I.).--One Gm. extract represents about 2 Gm. opium. Yields about 20 per cent. of anhydrous morphine. DOSAGE: 0.03 Gm. or 1/2 grain (U.S.P.).