Irish Sea, that part of the Atlantic ocean which lies between Scotland on the north, England on the east, "Wales on the south, and Ireland on the west. It contains the isle of Man, Anglesea, Holyhead, and a few islets. Carnarvon and Morecambe bays, and the estuaries of the Dee, Mersey, and Ribble, are its inlets in England; Solway frith, Wigtown and Luce bays, in Scotland; and Dundrum, Car-lingford, Dundalk, and Dublin bays, in Ireland. The principal rivers flowing into it from Great Britain are the Esk, Ribble, Mersey, and Dee; from Ireland, the Liffey and the Boyne.
See Ikon Mask.
Iroquois, an E. county of Illinois, bordering on Indiana and drained by the Kankakee river; area, 750 sq. m.; pop. in 1870, 25,782. It has a level surface, much of which is prairie, and the soil is generally fertile. The county is traversed by the Chicago branch of the Illinois Central railroad, and by the Toledo, Peoria, and Warsaw, the Gilman, Clinton, and Springfield, and the Chicago, Danville, and Vincennes lines. The chief productions in 1870 were 67,-640 bushels of wheat, 23,250 of rye, 799,810 of Indian corn, 430,746 of oats, 27,293 of flax seed, 87,127 of potatoes, 54,495 lbs. of wool, 30,194 of flax, 358,672 of butter, and 63,947 tons of hav. There were 12,716 horses, 10,-345 milch "cows, 21,135 other cattle, 14,986 sheep, and 21,764 swine; 7 manufactories of saddlery and harness, 1 of cooperage, 1 distillery, and 6 flour mills. Capital, Middleport.
Irvine, a parliamentary borough and seaport of Ayrshire, Scotland, on both banks of the river of the same name, 1 m. above its entrance into the Firth of Clyde, 20 m. S. TV. of Glasgow; pop. in 1871, 6,866. It has a female academy, ship yards, and some manufactories of book muslins, jaconets, and checks. The harbor, having become shallow from sand bars, now admits only vessels of about 100 tons.
Irwin, a S. county of Georgia, bounded N. E. by Ocmulgee river, and traversed by the Al-lapaha; area, about 1,000 sq. m.; pop. in 1870, 1,837, of whom 296 were colored. It has a level surface and a sandy soil, which is not very fertile except in the S. E. part. Pine forests occupy a large portion of the land. The Brunswick and Albany railroad touches the S. W. corner. The chief productions in 1870 were 27,875 bushels of Indian corn, 15,165 of oats, 23,220 of sweet potatoes, 16,510 lbs. of wool, and 153 bales of cotton. There were 257 horses, 9,021 cattle, 7,372 sheep, and 7,458 swine. Capital, Irwinville.
Isaac (Heb. Yitz'hak, will laugh, whose birth caused laughter), the second patriarch of the Hebrews, son of Abraham and Sarah, younger brother of Ishmael, and father of Jacob and Esau by Rebekah. The narrative of his life is contained in Genesis, according to which he was born when his father was 100 years old, was circumcised on the 8th day of his life, was about to be sacrificed by his father on Mt. Moriah, but was saved by divine interposition, lived partly as a nomad, partly as an agriculturist, in the southern region of Canaan and in Philistia, and died blind at the age of 180, after bestowing his chief blessing on his younger son Jacob, who, by the advice of his mother, had disguised himself to resemble Esau.