Ivry-la-Bataille. A town of France, department of Eure, 40 miles west of Paris. It is celebrated for the decisive victory which was gained by Henry IV. of Navarre over the forces under the Duke of Mayenne in 1590.

Ixcaquixtla. A town in the southern part of the state of Puebla, Mexico. It is noted in Mexican history as the scene of a sharp battle fought January 1, 1817, between Mexican insurgents under Gen. Mier of Teran, and the Spanish troops under La Madrid.

Izucar. A city of the state of Puebla, Mexico. Near here Gen. Matamoros, lighting for the independence of his country, gained a victory over the Spaniards, February 24, 1812.

J.

Jaca, or Jacca. A fortified town of Spain, in the province of Aragon, situated at the foot of the Pyrenees, on the river Aragon. It is a town of great antiquity, and, from its position, has been the scene of many sanguinary contests. Its occupation was eagerly coveted by every invader of the Peninsula, from Cato and Julius Cæsar to the generals of Napoleon.

Jack. See [Implements].

Jack (Fr. jacque). A coat of defensive armor, quilted and covered with leather, worn particularly by horsemen; a buff-jerkin; rarely, a coat of mail.

Jack, Hydraulic. See [Hydraulic Jack].

Jack in the Box. A very handy engine, consisting of a large wooden male-screw turning in a female one, which forms the upper part of a strong wooden box, shaped like the frustum of a pyramid. It is used by means of levers passing through holes in it as a press in packing, and for other purposes.