For disinfecting rooms, from 150 Cc. or 5 fluidounces to 1 quart or 1 liter of the official formaldehyde solution are allowed to each 1,000 cubic feet of space by various authorities. Various methods have been employed. One is to allow the solution to evaporate from sheets suspended in the tightly closed room. Another is to generate the gas in the room by treating the solution with potassium permanganate, allowing about 110 Gm. or 3-1/2 ounces of potassium permanganate to 500 Cc. or 1 pint of formaldehyde solution. A third method utilizes the reaction between formaldehyde solution and sodium dichromate in the presence of sulphuric acid, used in the proportion of 45 Cc. or 1-1/2 fluidounces of sulphuric acid and 280 Gm. or 9 ounces of sodium dichromate to 500 Cc. or 1 pint of formaldehyde solution. These methods are not effective if the temperature of the room be below 60 F. or the relative humidity below 65 per cent. =Frangula (Frang.), Frangula, U.S.P.= (Buckthorn Bark). ACTION AND USES: Similar to those of cascara sagrada; used principally as fluidextract. DOSAGE: 1 Gm. or 15 grains (U.S.P.). _Elixir Catharticum Compositum (Elix. Cathart. Co.), Compound Cathartic Elixir, N.F._--Fluidextract of frangula (12.5%), fluidextract of senna (10%), fluidextract of rhubarb (6.2%), spirit of peppermint, solution of potassium hydroxide and aromatic elixir. Absolute alcohol content about 25 per cent. USES: Needlessly complicated cathartic. DOSAGE: Aperient, 4 Cc. or 1 fluidrachm (N.F.); cathartic, 12 Cc. or 3 fluidrachms (N.F.). _Fluidextractum Frangulae (Fldext. Frangul.), Fluidextract of Frangula, U.S.P._ (Fluidextract of Buckthorn Bark).--Frangula (100%). Absolute alcohol content about 20 per cent. DOSAGE: 1 Cc. or 15 minims (U.S.P.) =Fraxinus (Fraxin.), White Ash Bark, N.F.= ACTION AND USES: Formerly used as tonic, astringent and purgative. No established indications for its use. DOSAGE: 2 Gm. or 30 grains (N.F.). _Vinum Fraxini (Vin. Frax.), Wine of White Ash, N.F._--White ash bark (50%), in alcohol and sherry wine. Absolute alcohol content about 30 per cent. DOSAGE: 4 Cc. or 1 fluidrachm (N.F.) =Fucus (Fucus), Fucus, N.F.= (Bladderwrack).--A sea weed. ACTION AND USES: Formerly used against goiters and tuberculous glands; may be of some value through its iodine content, but has no special advantage over other iodine preparations. DOSAGE: 0.65 Gm. or 10 grains (U.S.P.). _Fluidextractum Fuci (Fldext. Fuci), Fluidextract of Fucus, N.F._--Fucus (100%). Absolute alcohol content about 60 per cent. DOSAGE: 0.65 Cc. or 10 minims (N.F.) =Galangal (Galang.), Galangal, N.F.=--Rhizome. ACTION AND USES: Aromatic carminative, resembling ginger and without advantage over the latter. DOSAGE: 1 Gm. or 15 grains =Galega (Galeg.), Galega, N.F.= (European Goat's Rue).--Flowering tops.