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Fluo-ciiromic Acid is a gaseous compound, and is formed by distillingfc a mixture of fluor spar and chromate of lead in fuming or in commonsulphuric acid.

Fluoric Acid, discovered by Scheele in 1771, is obtained by treatingfluor spar with sulphuric acid. It has so strong an affinity for silicathat it corrodes glass and porcelain. It also rapidly disorganizesanimal substances. Its taste is very acid, and it has a strong pene-trating odour.

Fluorine is a peculiar substance, supposed to be elementary, but whichlias not hitherto been procured in a separate state. See Hydro-fluoric Acid.

Fluo-tantai.ic Acid. This is prepared from the new metal, tantalum,by treating it with fluoric acid.

Fluo-titanic Acid. A compound of the fluoric and titanic acids.

Flux, in the arts, a composition to assist the fusion of metals, usuallymade with borax, tartar, nitre, sal ammoniac, common salt, glass,&c, in varying proportions.Black Flux consists of white flux detonated by means of kindled char-coal in a mortar slightly covered, when the smoke unites with thealkalized nitre and the tartar, rendering it black.Cornish Reducing Flux. Mix well together 5X of tartar, Jiijss of nitre,

and jiij and 5J of borax.Cornish Refining Flux. Deflagrate, and then powder, two parts of

nitre and one part of tartar.White Flux. One part of nitre and two parts of tartar well mixedtogether.

Fojniculi Semina, L. E. D. P. Fennel Seeds. The seeds of Anc-Ihum fainiculum. Carminative and aromatic in doses of 9j to 5jbruised, in dyspepsia and flatulence, but not better than dill andcaraway.

Fomentum Camphoratum. Take gss of camphor, 51J of acetic acid,3X of common vinegar, and mix. (Ausustin.)

Ford's Balsam of Horehound is a cough nostrum, of which opiumis the basis, being composed of equal parts of horehound and liquoriceroot, infused in water, strained, and a double portion of spirit addedto nine pints, to which liquor add ^vij of pure opium, 5J of driedsquills, 5yj of benzoin, 5ix of camphor, ^viij of anise-seed, 11>J4 ofhoney ; digest and strain.

Ford's Laudanum. See Vinom Opii. L.

Forge Water. The water used by blacksmiths to cool their iron in.When taken clear in the morning from the trough, and used as agargle in aphthae, it is frequently useful. Dr. Paris detectedsulphate of iron in it. It is a popular remedy for asthenic chlorosis.