[Iron Gate], the name given to dangerous rapids in the Danube at Orsova, as it issues out of Hungary.
[Iron Hand], [Goetz von Berlichingen] (q. v.).
[Iron Mask, Man with the], a prisoner who in the reign of Louis XIV. wore, when he was transferred from prison to prison, what seemed an iron mask to prevent any one discovering and revealing his identity, over which to this day there hangs an impenetrable veil; he is reported to have been young and of noble form, and the conclusion is that he was a man of distinction.
[Ironclads] were originally wooden vessels protected by iron plates; they were used at the siege of Gibraltar in 1782; the French had them in the Crimean War, and in 1858 built four iron-plated line-of-battle ships; in 1860 England built the Warrior, an iron steam battleship with 4½-inch plates; since then new types have succeeded each other very quickly; the modern ironclad is built of steel and armed with steel plates sometimes 2 feet thick; the term is now loosely applied to all armoured vessels, whether battleships, or cruisers, or gunboats, and whether of iron or steel.
[Ironsides], Cromwell's troopers, a thousand strong, and raised by him in the Eastern counties of England, so called at first from the invincibility displayed by them at Marston Moor; were selected by Cromwell "as men," he says, "that had the fear of God before them, and made conscience of what they did.... They were never beaten," he adds, "and wherever they were engaged against the enemy, they beat continually."
[Irony] is a subtle figure of speech in which, while one thing is said, some indication serves to show that quite the opposite is meant; thus apparent praise becomes severe condemnation or ridicule; practical irony is evinced in ostensibly furthering some one's hopes and wishes while really leading him to his overthrow. Life and history are full of irony in the contrast between ambitions and their realisation.
[Irony, Socratic], the name given to a practice of Socrates with pretentious people; "affecting ignorance and pretending to solicit information, he was in the habit of turning round upon the sciolist and confounding his presumption, both by the unlooked-for consequences he educed by his incessant questions and by the glaring contradictions the other was in the end landed by his admissions."
[Iroquois], one of the most intelligent branches of the North American Indians, comprised a confederation of five, afterwards six, tribes, among whom the leading place was taken by the Mohawks; their territory lay inland in what is now New York State and the basin of the St. Lawrence. Numbering some 25,000, they maintained their own against the hereditary foes by whom they were surrounded; they took kindly to English and Dutch settlers, but were hostile to the French, and in the wars of the 18th century were allies of England against the French; their descendants, about 12,000, in reservations in Canada and New York are a peaceful people, have accepted English religion and culture, and have proved themselves skilful and industrious agriculturists.
[Irreducible Case], name given to a cubic equation which cannot be solved by the rule of [Cardan] (q. v.).
[Irtish], an enormous river of Western Siberia and chief tributary of the Obi; its course from the Altai Mountains runs NW. through the Siberian plains for 1200 m.; it is navigable almost all the way in summer, and in winter it is a highway for sledge traffic; on its banks stand Semipalatinsk, Omsk, and Tobolsk.