Origin of Species, The.—A work by Charles Robert Darwin, in which he put forward his theory of “natural selection.” It was published in 1859, and by many is regarded as the most important scientific work of the nineteenth century.

Orlando Furioso (or-län´dō fö-rē-ō´).—An epic poem in forty-six cantos, by Ariosto, which occupied his leisure for eleven years, and was published in 1516. This poem, which celebrates the semi-mythical achievements of the paladins of Charlemagne in the wars between the Christians and the Moors, became immediately popular, and has since been translated into all European languages, and passed through innumerable editions.

Ormulum (ôr´mū-lum).—The Ormulum is a collection of metrical homilies, one for each day of the year; but the single existing copy gives the homilies for thirty-two days only. There are very few French words in the poem, but Scandinavian words and constructions abound. The writer, Orm, or Ormin, belonged to the east of England, and he and his brother Walter were Augustinian monks. He makes no use of rhyme, but his verses are smooth and regular.

Osbaldistone (os-bâl´dis-ton).—Rob Roy, Scott. A family name in the story which tells of nine of the members: (1) the London merchant and Sir Hildebrand, the heads of two families; (2) the son of the merchant is Francis; (3) the offspring of the brother are Percival, the sot; Thorncliffe, the bully; John, the gamekeeper; Richard, the horse-jockey; Wilfred, the fool; and Rashleigh, the scholar, by far the worst of all. This last worthy is slain by Rob Roy, and dies cursing his cousin Frank, whom he had injured.

O’Shanter.—See [Tam O’Shanter].

Osman (os-män´).—Sultan of the East, conqueror of the Christians, a magnanimous man. He loved Yara, a young Christian captive. This forms the subject of a once famous ballad.

Osrick (oz´rik).—A court fop in Shakespeare’s Hamlet. He is made umpire by Claudius in the combat between Hamlet and Laertes.

Osseo.Hiawatha, Longfellow. Son of the Evening Star. When broken with age, he married Oweenee, one of ten daughters of a northland hunter. She loved him in spite of his ugliness and decrepitude, because “all was beautiful within him.” As he was walking with his nine sisters-in-law and their husbands, he leaped into the hollow of an oak tree and came out strong and handsome; but Oweenee at the same moment was changed into a weak old woman. But the love of Osseo was not weakened. The nine brothers and sisters-in-law were transformed into birds. Oweenee, recovering her beauty, had a son, whose delight was to shoot the birds that mocked his father and mother. An Algonquin legend gave the foundation of the story.

Othello (ō-thel´ō).—A tragedy by Shakespeare. The chief character is a Moor of Venice, who marries Desdemona, the daughter of a Venetian senator, and is led by his ensign, Iago, a consummate villain, to distrust her fidelity and virtue. Iago hated the Moor both because Cassio, a Florentine, was preferred to the lieutenancy instead of himself, and also from a suspicion that the Moor had tampered with his wife; but he concealed his hatred so well that Othello wholly trusted him. Iago persuaded Othello that Desdemona intrigued with Cassio, and urged him on till he murdered his bride.

Outre-Mer (ōōtr-mèr).—A Pilgrimage Beyond the Sea.—A series of prose tales and sketches by Henry Wadsworth Longfellow, published in 1835. “The Pays d’Outre-Mer,” says the writer, “is a name by which the pilgrims and crusaders of old designated the Holy Land. I, too, in a certain sense, have been a pilgrim of Outre-Mer; for to my youthful imagination the Old World was a kind of Holy Land, lying afar off beyond the blue horizon of the ocean. In this, my pilgrimage, I have traversed France from Normandy to Navarre; smoked my pipe in a Flemish inn; floated through Holland in a Trekschuit; trimmed my midnight lamp in a German university; wandered and mused amid the classic scenes of Italy; and listened to the gay guitar and merry castanet on the borders of the blue Guadalquivir.”