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or stuff made of matted fibers of wool, or wool and fur, fulled or wrought into a compact substance by rolling and pressure, with lees or size, without spinning or weaving. It were a delicate stratagem to shoe A troop of horse with felt. Shak .

ent, etc. See Fermentation. Ferments of the second class, on the other hand, are chemical substances, as a rule soluble in glycerin and precipitated by alcohol. In action they are catalytic and, mainly, hydrolytic. Good examples are pepsin of the dastric juice, ptyalin of the salvia, and disease of malt. globular prote…

the action of yeast; in a wider sense (Physiol. Chem.), the transformation of an organic substance into new compounds by the action of a ferment, either formed or unorganized. It differs in kind according to the nature of the ferment which causes it.

aining to, or derived from, a ferricyanide. Ferricyanic acid (Chem.), a brown crystalline substance, H6(CN)12Fe2, obtained from potassium ferricyanide, and regarded as the type of the ferricyanides; -- called also hydro-ferricyanic acid, hydrogen ferricyanide, etc.

rived from, or designating, a ferrocyanide. ferrocyanic acid (Chem.), a white crystalline substance, H4(CN)6Fe, of strong acid properties, obtained from potassium ferrocyanide, and regarded as the type of the ferrocyanides; -- called also hydro- ferrocyanic acid, hydrogen ferrocyanide. etc.

Any fine, slender thread, or threadlike substance; as, a fiber of spun glass; especially, one of the slender rootlets of a plant.

A white, albuminous, fibrous substance, formed in the coagulation of the blood either by decomposition of fibrinogen, or from the union of fibrinogen and paraglobulin which exist separately in the blood. It is insoluble in water, but is readily digestible in gastric and pancreatic juice.

An albuminous substance existing in the blood, and in other animal fluids, which either alone or with fibrinoplastin or paraglobulin forms fibrin, and thus causes coagulation.

An albuminous substance, existing in the blood, which in combination with fibrinogen forms fibrin; -- called also paraglobulin.

ridges or teeth, made by indentation with a chisel, used for abrading or smoothing other substances, as metals, wood, etc.

Any porous substance, as cloth, paper, sand, or charcoal, through which water or other liquid may passed to cleanse it from the solid or impure matter held in suspension; a chamber or device containing such substance; a strainer; also, a similar device for purifying air. Filter bed, a pond, the bottom of which is a fil…

er by study or experiment direct to an object or end; as, water is found to be a compound substance.

vy fire. Blue fire, Red fire, Green fire (Pyrotech.), compositions of various combustible substances, as sulphur, niter, lampblack, etc., the flames of which are colored by various metallic salts, as those of antimony, strontium, barium, etc. -- Fire alarm (a) A signal given on the breaking out of a fire. (b) An appar…

A gun, pistol, or any weapon from a shot is discharged by the force of an explosive substance, as gunpowder.

Detached from substance. [Obs.] Does passion still the firmless mind control Pope.

A yellow crystalline substance extracted from fustet, and regarded as its essential coloring principle; -- called also fisetic acid.

A narrow opening, made by the parting of any substance; a cleft; as, the fissure of a rock. Cerebral fissures (Anat.), the furrows or clefts by which the surface of the cerebrum is divided; esp., the furrows first formed by the infolding of the whole wall of the cerebrum. -- Fissure needle (Surg.), a spiral needle for…

on; to cease to flow or be fluid; to congeal; to become hard and malleable, as a metallic substance. Bacon. To fix on, to settle the opinion or resolution about; to determine regarding; as, the contracting parties have fixed on certain leading points.

The act of uniting chemically with a solid substance or in a solid form; reduction to a non-volatile condition; -- said of gaseous elements.

a flashing, revolving, or intermittent light. -- Fixed oils (Chem.), non-volatile, oily substances, as stearine and olein, which leave a permanent greasy stain, and which can not be distilled unchanged; -- distinguished from volatile or essential oils. -- Fixed pivot (Mil.), the fixed point about which any line of t…