Jockey, v. To jostle by riding against one; to cheat, to trick; to ride; to ride unfairly.

Joint, s. Articulation of limbs, juncture of moveable bones in animal bodies; hinge; a knot in a plant. Out of joint, luxated, slipped from the socket, or corresponding part where it naturally moves.

Journey, s. The travel of a day; travel by land.

Ipecacuanha, s. An Indian plant.

Ipecacuanha is sometimes employed as an expectorant in chronic cough and asthmatic affections, and I believe with good effect when joined with squills, ammoniacum, &c.—White.

Iris, s. The rainbow; the circle round the pupil of the eye, which is striped and variegated.

Hanging from the upper edge of the pupil of the horse, are found two or three round black bodies, as large as millet seeds. When the horse is suddenly brought into an intense light, and the pupil is closed, these bodies present a singular appearance, being squeezed out from between the edges of the iris. An equal number, but much smaller, are attached to the edge of the lower portion of the iris. Their general use is probably to intercept portions of light which would be troublesome or injurious; but their principal function is accomplished during the act of grazing. They are larger on the upper edge of the iris, and are placed on the outer side of the pupil, evidently to obstruct the light in those directions in which it would come with greatest force, both from above and even from below, while at the same time, the field of view is perfectly open, so far as it regards the pasture on which the horse is grazing.

The colour of the iris is, in some unknown way, connected with this black point behind. Wall-eyed horses, whose iris is white, have no uvea.—The Horse.

Irish Horse, s.

In some of the rich grazing counties, as Meath and Roscommon, a large long blood horse is reared of considerable value, but he seldom has the elegance of the English horse; he is larger headed, more leggy, ragged-hipped, angular, yet with great power in the quarters, much depth beneath the knee, stout and hardy, full of fire and courage, and the best leaper in the world.