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lye, and has been an important source of potassium compounds. It is used in making soap, glass, etc.

A glassy volcanic rock of a grayish color and pearly luster, often having a spherulitic concretionary structure due to the curved cracks produced by contraction in cooling. See Illust. under Perlitic.

ow, a small show, or object exhibited, which is viewed through an orifice or a magnifying glass. -- Peep-o'-day boys, the Irish insurgents of 1784; -- so called from their visiting the house of the loyal Irish at day break in search of arms. [Cant]

Glass threads or fibers formed by the wind from bits blown from frothy lava or from the tips of lava jets or from bits of liquid lava thrown into the air. It often collects in thick masses resembling tow.

especially of substances which allow the passage of fluids; as, wood is permeable to oil; glass is permeable to light. I. Taylor.

A glass through which objects are viewed. [Obs.] "Not a perspective, but a mirror." Sir T. Browne.

Optically; as through a glass. [R.] You see them perspectively. Shak.

An optical glass; a telescope. [Obs.] Crashaw.

The quality or state of being pervious; as, the perviousness of glass. Boyle.

y a magic lantern. The figures are painted in transparent colors, and all the rest of the glass is opaque black. The screen is between the spectators and the instrument, and the figures are often made to appear as in motion, or to merge into one another.

A glassy colorless mineral occurring in rhombohedral crystals, sometimes used as a gem. It is a silicate of glucina, and receives its name from its deceptive similarity to quartz.

A glass vessel or bottle, especially a small bottle for medicines; a vial.

oric sea." Byron. Glacial phosphoric acid. (Chem.) (a) Metaphosphoric acid in the form of glassy semitransparent masses or sticks. (b) Pure normal phosphoric acid. -- Phosphoric acid (Chem.), a white crystalline substance, H3PO4, which is the most highly oxidized acid of phosphorus, and forms an important and extensiv…

. Its body is remarkably thin, flat, and transparent; the legs are very long. Called also glass-crab, and glass-shrimp.

The glasseye, or wall-eyed pike. See Wall-eye.

shore; a pier which by its strength and stability resists the thrust of an arch. -- Pier glass, a mirror, of high and narrow shape, to be put up between windows. -- Pier table, a table made to stand between windows.

Eyeglasses kept on the nose by a spring.

A small glass tube, often with an enlargement or bulb in the middle, and usually graduated, -- used for transferring or delivering measured quantities.

d pit (Hort.), an excavation in the earth, lined with masonry or boards, and covered with glass, but not artificially heated, -- used in winter for the storing and protection of half-hardly plants, and sometimes in the spring as a forcing bed. -- Pit coal, coal dug from the earth; mineral coal. -- Pit frame, the fram…

An igneous rock of semiglassy nature, having a luster like pitch.