ORIGINAL SIN, the name given by the theologians to the inherent tendency to sin on the part of all mankind, due, as alleged, to their descent from Adam and the imputation of Adam’s guilt to them as sinning in him.
ORINOCO RIVER, a great river in the NE. of South America, rises in the Parime Mountains, and flowing westward bifurcates, the Cassiquiare channel going southward and joining the Rio Negro, the Orinoco proper continuing westward, north and east through Venezuela, and reaching the Atlantic after a course of 1500 m. by an enormous delta; it receives thousands of tributaries, but cascades half-way up stop navigation.
ORION, in the Greek mythology a handsome giant and hunter, was struck blind by Dionysos for attempting an outrage on Merope, but recovered his eyesight on exposing his eyeballs to the arrowy rays of Aurora, and became afterwards the companion of Artemis on the hunting-field, but he fell a victim to the jealousy of Apollo, the brother of Artemis, and was transformed by the latter into a constellation in the sky, where he figures as a giant wearing a lion’s skin and a girdle or belt and wielding a club.
ORISSA (4,047), the name of an ancient Indian kingdom, independent till 1568, and falling into British possession in 1803, is now restricted to the most south-easterly province of Bengal. It is larger than Wales, and comprises a hilly inland tract and an alluvial plain formed by the deltas of the Mahanadi, Brahmani, and Baitarani Rivers, well irrigated, and producing great crops of rice, wheat, pulse, and cotton. It has no railways, and poor roads; transport is by canal and river. Chief towns Cuttack, Balasor, and Puri.
ORKNEY ISLANDS (30), an archipelago of 90 islands, Pomona the largest, lying north of the Scottish mainland, from which they are separated by the Pentland Firth, 7 m. broad. The scenery is tame, the climate is mild and moist; there are no trees, crops are poor; the chief industries are fishing and stock-raising; Kirkwall, with a cathedral, and Stromness are the chief towns. Seized from the Picts by Norse vikings, they passed to James III. as security for the dowry of Margaret of Denmark and were never redeemed. The natives show their Scandinavian ancestry in their features, and the nomenclature is largely Scandinavian.