an ancient tenure, the service whereof was to blow a horn when any invasion of the Scots was perceived.

This tenure was very frequent in the northern counties near the Picts wall.

**Cornea tunica**, in anatomy. See Vol. I. p. 289.

**Cornel-tree**, in botany. See Cornus.

**Cornelian**. See Carnelian.

**Corner**, in a general fence, the same with angle. See Angle.

**Cornet**, in the military art of the ancients, an instrument much in the nature of a trumpet, which when it only sounded, the ensigns were to march alone, without the soldiers; whereas, when the trumpet only sounded, the soldiers were to move without the ensigns. The cornets and buccine sounded the charge and retreat, and the cornets and trumpets sounded during the course of the battle.

**Cornet**, in the military art of the moderns, the third commission-officer in a troop of horse or dragoons.

This is a very honourable post: he commands in the lieutenant's absence; his principal duty being to carry the standard, near the middle of the first rank of the squadron.

**Corneus**, the name by which Linnæus calls a kind of tin-ore, found in black columns, with irregular sides, and terminating in prisms.

**Corniche**, Cornish, or Cornice, in architecture. See Architecture.

**Corniche** is also used, in general, for all little projections in masonry or joinery, even where there are no columns, as the corniche of a chimney, beaufet, &c.

**Corniche-ring**, of a piece of ordnance, is that next from the muzzle-ring, backward.

**Cornicularius**, in Roman antiquity, an officer of the army, appointed to assist the military tribune in quality of lieutenant.

**Corrix**, in ornithology, the trivial name of a species of corvus. See Corvus.

**Cornu**. See Horn.

**Coru ammonis**, in natural history, fossil shells, called also serpent-stones, or snake-stones.

They are found of all sizes, from the breadth of a sixpence, to more than two feet in diameter; some of them rounded, others greatly compressed, and lodged in different strata of stones and clays; some again are smooth, and others ridged in different manners, their striae and ridges being either straight, irregularly crooked, or undulated.

**Coru cervi**. See Hartshorn.

**Corncopia**, or Horn of Plenty, among painters, &c., is represented under the figure of a large horn, out of which issue fruits, flowers, &c. Upon medals the cornucopia is given to all deities, genii, and heroes, to mark the felicity and abundance of all the wealth procured by the goodness of the former, or the care and valour of the latter.

**Corncopie**, in botany, a genus of the triandria digynia clasps. The involucrem consists of one tunnel-shaped crenated leaf, containing many flowers; and the calices are double-valved. There is but one species, viz. the cucullatum, a native of Smyrna.

**Cornus**, or Cornel-tree, in botany; a genus of the tetrandria monogynia clasps. The involucrem consists mostly of four leaves; the petals are four, and above the fruit, which is a bilocular gluma. There are five species, none of them natives of Britain.

**Cornutia**, in botany, a genus of the didynamia angiospermia clasps. The calix has five teeth; the stamina are longer than the corolla; the stylus is very long; and the berry contains but one seed.

**Cornwal**, the most westerly county of England, which gives the title of duke to the prince of Wales. It sends forty-four members to parliament.

**Corolla**, among botanists, the most conspicuous part of a flower, surrounding the organs of generation, and composed of one or more flower-leaves, most commonly called petals, to distinguish them from the leaves of the plant; according as there is one, two, or three of these petals, the corolla is said to be monopetalous, dipetalous, tripetalous, &c.

**Corollary** is a consequence drawn from something already advanced or demonstrated.

**Corollula**, a term used by botanists, to express the little partial flowers, which together make up the compound ones.

**Corona**, among anatomists, denotes that edge of the glans penis where the preputium begins. See Anatomy.

**Corona**, among botanists. See Pappus.

**Corona borealis**, the Northern crown, in astronomy. See Vol. I. p. 486.

**Corona imperialis**, in zoology, a synonyme of a species of conus. See Conus.

**Corona imperialis**, in botany. See Fritillaria.