=*Colchici Semen (Colch. Sem.), Colchicum Seed, U.S.P.= (Colchici Semen P.I.).--Yields not less than 0.45 per cent. of colchicine. ACTION AND USES: Same as those of colchicum corm. DOSAGE: 0.2 Gm. or 3 grains (U.S.P.). _Fluidextractum Colchici Seminis (Fldext. Colch. Sem.), Fluidextract of Colchicum Seed, U.S.P._--Colchicum seed (100%), yielding about 0.4 per cent. of colchicine. Absolute alcohol content about 55 per cent. DOSAGE: 0.2 Cc. or 3 minims (U.S.P.). _*Tinctura Colchici Seminis (Tr. Colch. Sem.), Tincture of Colchicum Seed, U.S.P._ (Colchici Tinctura P.I.).--Colchicum seed (10%), yielding about 0.04 per cent. of colchicine; in alcohol and water. Absolute alcohol content about 56 per cent. DOSAGE: 2 Cc. or 30 minims (U.S.P.). _Vinum Colchici Seminis (Vin. Colch. Sem.), Wine of Colchicum Seed, N.F._--Fluidextract of colchicum seed (10%), yielding about 0.04 per cent. of colchicine; in alcohol and sherry wine. Absolute alcohol content about 35 per cent. DOSAGE: 2 Cc. or 30 minims (N.F.). =Colchicina (Colchicina), Colchicine, U.S.P.=--An alkaloid obtained from colchicum. Pale yellow, odorless scales or powder. Freely soluble in alcohol, soluble in water (1:22) and slightly soluble in ether (1:220). ACTION AND USES: Same as those of colchicum corm. DOSAGE: 0.5 mg. or 1/120 grain. =COLLODIA, COLLODIONS.=--Collodions are solutions of pyroxylin or soluble gun cotton with medicinal agents, for external application. For the official collodions see under the names of the principal ingredients. In particular, for Collodium, see under =Pyroxylin=; for Collodium Flexible, under =Oleum Ricini=; and for Collodium Stypticum, under =Acidum Tannicum=. =*Colocynthis (Colocyn.), Colocynth, U.S.P.= (Colocynth Pulp, Bitter Apple, Colocynth Apple). ACTION AND USES: A powerful irritant hydragogue cathartic. Because of its drastic nature it is rarely used alone. The various compound pills listed below are needlessly complex and therefore irrational. Because of their irritant character, they are especially unsuited for continued use. DOSAGE: 0.06 Gm. or 1 grain. _*Extractum Colocynthidis (Ext. Colocynth.), Extract of Colocynth, U.S.P._ (Powdered Extract of Colocynth).--One Gm. of extract represents 4 Gm. of colocynth. DOSAGE: 0.015 Gm. or 1/4 grain (U.S.P.). _*Extractum Colocynthidis Compositum (Ext. Colocynth. Co.), Compound Extract of Colocynth, U.S.P._ (Powdered Compound Extract of Colocynth).--Extract of colocynth (16%), aloes (50%), resin of scammony (14%), cardamom seed and soap. DOSAGE: 0.25 Gm. or 4 grains (U.S.P.). _Pilulae Catharticae Compositae (Pil. Cathart. Co.), Compound Cathartic Pills, U.S.P._--Each pill contains compound extract of colocynth (0.08 Gm. or 1-1/3 grains), mild mercurous chloride (0.06 Gm. or 1 grain), resin of jalap (0.02 Gm. or 1/3 grain) and gamboge (0.015 Gm. or 1/4 grain). DOSAGE: 2 pills (U.S.P.).