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FLUO

It is soft, insoluble in water, softens in the air, and melts on hotcoals. It contains carbon, azote, oxygen, and hydrogen.

Ficus. Fig. See Caric.e.

Filicis Radix. L. E. D. P. Male Fern Root. Aspidium Jilix mas,Polypody, or Pohjpodhim. O. It has but little smell, and a muci-laginous, bitter, and austere taste.Incompatible with iron and its salts, as it contains both tannin and

gallic acid.Medicinally it is astringent and vermifuge in doses of 51J to 5iij, joinedwith calomel and jalap for tape-worm, and lumbrici.

Flake Manna. See Manna.

Flake White. A pigment consisting of subcarbonate, or white oxideof lead, prepared by hanging sheets of lead over evaporating vinegar,the vessel containing the vinegar being placed in a steam-bath. It isinferior to Sulphate op Baryta, which see.

Flash. A preparation sold by brewers' druggists, to colour brandy andrum, and to give them iictitious strength. It is prepared by making anextract of cayenne pepper, or capsicum, and adding to it burnt sugar.

Flax. See Linum.

Fly-water may be prepared with white arsenic, king's yellow, orpi-ment, or corrosive sublimate; but these being all very poisonous arenot safe to be left in apartments where children have access. Infu-sion of quassia is as good, and is not poisonous.

Flores. Flowers. A term now disused, but formerly applied to lightpowders, such as flower of brimstone.

Flour op Mustard. Manufactured chiefly at Durham, by drying theseeds of mustard, powdering, and sifting them.Adulterated with bean flour and common salt, the yellow colour beinggiven by turmeric, and the piquancy by cayenne pepper.

Flowers of Benjamin. See Acidum Benzoicum.

Flowers of Brimstone, or Sulphur. See Sulphur Sublimatum.

Flowers of Zinc. See Zinci Oxidum.

Fluo-Silicic Acid is a gaseous substance formed whenever hydro-fluoric acid conies in contact with silicious earth. It ought to be col-lected over mercury.

Fluo-i;orates are salts formed with fluoboric acid and alkaline bases,but have been as yet little investigated.

Fluo-boric Acid is a gaseous substance prepared by mixing one partof vitrified boracic acid, and two of fluor spar, with twelve partsof strong sulphuric acid, and heating the mixture in a glass retort.Or, by the action of hydro-fluoric acid, on a solution of boracic acid.Absorbs water so rapidly that it furnishes a delicate test for the presenceof moisture in gases; producing a dense white cloud of vapour.