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ng a concave surface above. This structure is characteristic of certain igneous rocks, as basalt, and is due to contraction in cooling.

which divide the sandstone contrast finely with the divisional planes which separate the basalt into pillars. Lyell.

ryllus, and allied genera. The males make chirping, musical notes by rubbing together the basal parts of the veins of the front wings.

sting principally of silicate of iron, and crystallizing in hexagonal prisms with perfect basal cleavage; -- so named from the Swedish mineralogist Cronstedt.

Covered with a crust; as, crustated basalt.

dspar with magnetic iron. By many authors it is considered equivalent to a coarse-grained basalt.

The basal substance of the cell nucleus; a hyaline or granular substance, more or less fluid during life, in which the other parts of the nucleus are imbedded.

In crustaceans: The part of the side of a somite external to the basal joint of each appendage. See Illust. under Crustacea.

anding out; projecting beyond some other part; as, exsert stamens. A small portion of the basal edge of the shell exserted. D. H. Barnes.

, plant, or thing, of extraordinary size or power. Giant's Causeway, a vast collection of basaltic pillars, in the county of Antrim on the northern coast of Ireland.

A grayish or greenish compact rock, composed of feldspar and augite, and allied to basalt.

Shaped like the head of a halberd; triangular, with the basal angles or lobes spreading; as, a hastate leaf.

sh-water hydroid of the genus Hydra, usually found attached to sticks, stones, etc., by a basal sucker.

Resulting from, or produced by, the action of fire; as, lavas and basalt are igneous rocks.

te terminal band on the tail. The feathers on the head of the adults show a bright orange basal spot when erected. Called also bee bird, and bee martin. Several Southern and Western species of Tyrannus are also called king birds.

Any one of several dark-colored augitic, eruptive rocks allied to basalt.

A mineral occurring in small yellow crystals, found in the lavas (melilite basalt) of Vesuvius, and elsewhere. [Written also mellilite.]

The middle one of the three principal basal cartilages in the fins of fishes. -- Me*sop`ter*yg"i*al, a.

The posterior of the three principal basal cartilages in the fins of fishes. -- Me*tap`ter*yg"i*al, a.

A block of black basalt, found at Dibon in Moab by Rev. F. A. Klein, Aug. 19, 1868, which bears an inscription of thirty-four lines, dating from the 9th century b. c., and written in the Moabite alphabet, the oldest Phonician type of the Semitic alphabet. It records the victories of Mesha, king of Moab, esp. those over…