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ic acid, a metameric variety which turns the plane of polarization to the right, although formed by the oxidation of a levorotatory amyl alcohol.

The depression formed by the meeting of two slopes on a flat roof. Valley board (Arch.), a board for the reception of the lead gutter in the valley of a roof. The valley board and lead gutter are not usual in the United States. -- Valley rafter, or Valley piece (Arch.), the rafter which supports the valley. -- Valley…

firmness; personal bravery; courage; prowess; intrepidity. For contemplation he and valor formed. Milton. When valor preys on reason, It eats the sword it fights with. Shak. Fear to do base, unworthy things is valor. B. Jonson.

a valve rests or against which it presses. (b) A part or piece on which such a surface is formed. -- Valve stem (Mach.), a rod attached to a valve, for moving it. -- Valve yoke (Mach.), a strap embracing a slide valve and connecting it to the valve stem.

Formed with different shapes; having various forms; variform.

Formed like a vase, or like a common flowerpot.

The green rust formed on copper. [Colloq.]

g, with irregular lines or impressions resembling the tracks of worms, or appearing as if formed by the motion of worms.

The state of containing vesicles, or the process by which vesicles are formed.

A continuous tube formed from superposed large cylindrical or prismatic cells (tracheæ), which have lost their intervening partitions, and are usually marked with dots, pits, rings, or spirals by internal deposition of secondary membranes; a duct. Acoustic vessels. See under Acoustic. -- Weaker vessel, a woman; -- now…

Visual yellow (Physiol.), a product intermediate between visual purple and visual white, formed in the photochemical action of light on visual purple.

vitelline substance; -- applied to certain cells (also called nutritive, or yolk, cells) formed in the ovaries of many insects, and supposed to supply nutriment to the developing ova.

quality of being vitrescent; capability of conversion into glass; susceptibility of being formed into glass. Kirwan.

Capable of being formed into glass; tending to become glass.

brute animals, especially of horses, seated in the glands under the ear, where a tumor is formed which sometimes ends in suppuration.

A column of igneous rock formed by congelation of lava in the conduit of a volcano and later exposed by the removal of surrounding rocks.

Any voluta. Volute spiring, a spring formed of a spiral scroll of plate, rod, or wire, extended or extensible in the direction of the axis of the coil, in which direction its elastic force is exerted and employed.

An imaginary tube within a rotating fluid, formed by drawing the vortex lines through all points of a closed curve.

ediately in the wake of his earliest exertions. De Quincey. Several humbler persons . . . formed quite a procession in the dusty wake of his chariot wheels. Thackeray.

A slimy substance deposited on land by tides, etc., by which a rich alluvial soil is formed. Lyell.