_Elixir Formatum Compositum (Elix. Format. Co.), Compound Elixir of Formates, N.F._--Sodium formate (3%), magnesium formate (2.5%), strontium formate (2.5%), lithium formate (1%), quinine formate (0.8%), compound spirit of cardamom, acetic ether, alcohol, glycerin and distilled water. Absolute alcohol content about 9.9 per cent. DOSAGE: 8 Cc. or 2 fluidrachms (N.F.). _Spiritus Acidi Formici (Sp. Ac. Formic.), Spirit of Formic Acid, N.F._ (Spiritus Formicarum, Spirit of Ants).--Formic acid (4%) in distilled water and alcohol. Absolute alcohol content about 70 per cent. USES: Rubefacient. DOSAGE: 4 Cc or 1 fluidrachm (N.F.) =Acidum Gallicum (Acid. Gallic.), Gallic Acid, U.S.P.= An odorless, almost white powder, with an astringent taste. Soluble in water (1:87) and freely soluble in alcohol (1:4.6) and in glycerin (1:10). ACTION AND USES: Mild astringent; not very effective. DOSAGE: 1 Gm. or 15 grains (U.S.P.). =Acidum Hydriodicum Dilutum (Acid. Hydriod. Dil.), Diluted Hydriodic Acid, U.S.P.=--HI (about 10%). A colorless, odorless liquid, with a strong acid taste. Incompatible with alkalies and their carbonates, also with metallic oxides and salts of silver and of lead. ACTION AND USES: Has the general properties of iodides. DOSAGE: 0.5 Cc. or 8 minims (U.S.P.), diluted. Administered chiefly in the form of syrup as a substitute for the alkali iodides, over which it has no material advantage. _Syrupus Acidi Hydriodici (Syr. Acid. Hydriod.), Syrup of Hydriodic Acid, U.S.P._--Hydriodic acid (about 1.25%). DOSAGE: 4 Cc. or 1 fluidrachm (U.S.P.). =Acidum Hydrobromicum Dilutum (Acid. Hydrobrom. Dil.), Diluted Hydrobromic Acid, U.S.P.=--HBr (about 10%). A colorless, odorless liquid, with a strong acid taste. Incompatible with alkalies and their carbonates, metallic oxides and the salts of silver and of lead. ACTION AND USES: In general, those of bromides; but the preparation is objectionable because of its acidity. DOSAGE: 1 Cc. or 15 minims (U.S.P.), diluted. =*Acidum Hydrochloricum (Acid. Hydrochl.), Hydrochloric Acid, U.S.P.= (Muriatic Acid).--HCl (about 32%). A fuming, corrosive liquid. Incompatible with alkalies and their carbonates, metallic oxides and salts of silver and of lead. ACTION AND USES: Used in gastric hypoacidity; also as caustic; antiseptic. _*Acidum Hydrochloricum Dilutum (Acid. Hydrochl. Dil.), Diluted Hydrochloric Acid, U.S.P._--HCl (about 10%). A colorless, odorless, strongly acid solution. DOSAGE: 1 Cc. or 15 minims (U.S.P.), after meals, diluted in one-half to one glass water and taken through a glass tube to protect the teeth. =Acidum Hydrocyanicum Dilutum (Acid. Hydrocyan. Dil.), Diluted Hydrocyanic Acid, U.S.P.= (Diluted Prussic Acid, Acidum Hydrocyanicum Dilutum, P.I.).--HCN (about 2%). A colorless liquid, with an odor like that of bitter almonds.