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Oldenburg (355), a German grand-duchy, embracing these three territories: 1, Oldenburg proper, the largest, is let into Hanover with its northern limit on the North Sea; it is a tract of moorland, sand-down, and fen, watered by the Weser, Hunte and tributaries of the Ems; here is the capital, Oldenburg (22), on the Hunte, 30 m. NW. of Bremen, in the midst of meadows, where a famous breed of horses is raised. 2, Lübeck, lying in Holstein, N. of but not including the city of Lübeck. 3, Birkenfeldt, lying among the Hundsrück Mountains, in the S. of Rhenish Prussia; independent since 1180, Danish 1667-1773, Oldenburg acquired Lübeck in 1803, and Birkenfeldt in 1815, when it was raised to the rank of grand-duchy.

Oldham (184), on the Medlock, 7 m. NE. of Manchester, is the largest of the cotton manufacturing towns round that centre; it has 300 cotton mills, and manufactures besides silks, velvets, hats, and machinery; there is a lyceum, and a school of science and art.

Oldys, William, bibliographer, was a man of dissolute life, the illegitimate son of a chancellor of Lincoln; he was librarian to the Earl of Oxford for 10 years, and afterwards received the appointment of Norroy king-of-arms; besides many bibliographical and literary articles, he wrote a "Life of Raleigh" and "The Harleian Miscellany" (1696-1761).

Oléron (17), an island of France, in the Bay of Biscay, at the mouth of the Charente, 11½ m. long and from 3 to 7 broad, is separated from the mainland by a shallow, narrow channel.

Olga, St., a Scandinavian pagan prince, converted to Christianity and baptized as Helena; laboured for the propagation of the Christian faith among his subjects, was canonised after in 905, and is one of the saints of the Russian Church. Festival, July 21.

Olifaunt, Nigel, the hero in Scott's "Fortunes of Nigel."

Oliphant, Laurence, religious enthusiast and mystic, born in Perthshire; spent his boyhood in Ceylon, where his father was chief-justice; early conceived a fondness for adventure, accompanied Lord Elgin to Washington as his secretary, and afterwards to China and Japan; became M.P. for the Stirling Burghs, mingled much in London society, contributed to Blackwood, and wrote "Piccadilly," pronounced by Mrs. Oliphant "one of the most brilliant satires on society ever published"; parliamentary people and parliamentary life being nowise to his liking he soon threw both up for life in a community with Harris at Lake Erie, U.S., whence, after two years' probation, he returned to resume life in the wide world; while in France during the Franco-German War, he married one Alice l'Estrange, an alliance which grew into one of the most intimate character; with her he went to Palestine, pitched his tent under the shadow of Mount Carmel, and wrote two mystical books under her inspiration, which abode with him after she was dead; after her decease he married a Miss Owen, that she might help him in his work, but all she had opportunity to do was to minister to him on his deathbed (1829-1888).

Oliphant, Mrs. Margaret (née Wilson), authoress, born at Wallyford, near Musselburgh, a lady of varied abilities and accomplishments, and distinguished in various departments of literature, began her literary career as a novelist and a contributor to Blackwood, with which she kept up a lifelong connection; her first work which attracted attention was "Passages in the Life of Mrs. Margaret Maitland," and her first success as a novelist was the "Chronicles of Carlingford"; she wrote on history, biography, and criticism, the "Makers of Florence, of Venice, of Modern Rome," "Lives of Dante, Cervantes, and Edward Irving," among other works, and was engaged on a narrative of the publishing-house of Blackwood when she died; she might have distinguished herself more had she kept within a more limited range; her last days were days of sorrow under heavy bereavement (1828-1897).

Olivarez, Count d', a Spanish statesman, born at Rome, where his father was ambassador; was the confidant and minister of Philip IV., and the political adversary of Richelieu; was one of the ablest statesmen Spain ever had, but was unfortunate in his conduct of foreign affairs (1587-1645).

Oliver, a favourite paladin of Charlemagne's, who, along with Roland, rode by his side, and whose name, along with Roland's, has passed into the phrase, a "Roland for an Oliver," meaning one good masterstroke for another, such as both these knights never failed to deliver.

Olives, Mount of, or Mount Olivet, a ridge with three summits, stretching N. and S., E. of Jerusalem, in height 150 ft. above the city, 400 ft. above the intervening valley of Kedron, and 2682 ft. above the sea-level; so called as at one time studded with olive-trees; is celebrated as the scene of some of the most sacred events in the life of Christ.

Ollivier, Émile, French statesman, born at Marseilles; bred for the bar, and eminent at it; became Prime Minister under Louis Napoleon in 1870; precipitated "with a light heart" the country into a war with Germany, to his own overthrow; retired thereafter to Italy, but returned in 1872, and devoted himself to literature; died at Geneva (1825-1876).

Olmütz (20), a strongly fortified city in Moravia, and an important centre of trade, and the former capital of the country; suffered severely in the Thirty and the Seven Years' Wars.

Olympia, a plain in a valley in Elis, on the Peloponnesus, traversed by the river Alpheus, and in which the Olympic Games were celebrated every fifth year in honour of Zeus, and adorned with temples (one to Zeus and another to Hera), statues, and public buildings.

Olympiad, a name given to the period of four years between one celebration of the Olympic Games and another, the first recorded dating from July 776 B.C.

Olympias, the wife of Philip II. of Macedonia, and mother of Alexander the Great; divorced by Philip, who married another, she fled to Epirus, and instigated the assassination of Philip and the execution of her rival; returned to Macedonia on the accession of her son, who always treated her with respect, but allowed her no part in public affairs; on his death she dethroned his successor, but driven to bay in her defence afterwards, she was compelled to surrender the power she had assumed, and was put to death 316 B.C.

Olympic Games, were originally open only to competitors of pure Hellenic descent, and the reward of the victors was but a wreath of wild olive, though to this their fellow-citizens added more substantial honours; they consisted of foot and chariot races, and feats of strength as well as dexterity. See Olympia.

Olympus, a mountain range in Greece, between Thessaly and Macedonia, the highest peak of which is 9750 ft.; the summit of it was the fabled abode of the Greek gods; it is clothed with forests of pine and other trees.

Olney, a little town in Buckinghamshire, associated with the life of Cowper, and where he wrote, along with John Newton, the "Olney Hymns."

Om, a mystic word among the Hindus and Buddhists; presumed to be latent with some magic virtue, and used on solemn occasions as a sort of spiritual charm efficacious with the upper powers, and potent to draw down divine assistance in an hour of need.

Omagh (4), on the Strule, 34 m. S. of Londonderry; is the county town of Tyrone; though a very ancient town it has been rebuilt since 1743, when it was destroyed by fire; it is the head-quarters of the NW. military district.

Omaha (102), chief city of Nebraska, on the W. bank of the Missouri, 20 m. above the confluence of the Platte; is connected by a bridge with Council Bluffs on the opposite shore; it has many fine buildings, including colleges and schools; its silver-smelting works are the largest in the world; it ranks third in the pork-packing industry, and has besides manufactures of linseed oil, boilers, and safes; an important railway centre, it lies midway between the termini of the Union Pacific Railroad; near it are the military head-quarters of the Platte department.

Oman, a territory of Arabia, lying along the shores of the Persian Gulf and the Arabian Sea, round the south-eastern nob of the peninsula; has some stretches of very fertile country where there happens to be water for irrigation, but the coast is very hot and not healthy. The region is subject to the Sultan of Muscat, who is in turn a pensioner of the Anglo-Indian Government.

Omar, the successor of Abu-Bekr, and the second Caliph from 634 to 644; was at first a persecutor of the Faithful, but underwent in 615 a sudden conversion like Said, with a like result; was vizier of Abu-Bekr before he succeeded him; swept and subdued Syria, Persia, and Egypt with the sword in the name of Allah, but is accused of having burned the rich library of Alexandria on the plea that it contained books hostile to the faith of Islam; he was an austere man, and was assassinated by a Persian slave whose wrongs he refused to redress.

Omar Khayyám, astronomer-poet of Persia, born at Naishapur, in Khorassan; lived in the later half of the 11th century, and died in the first quarter of the 12th; wrote a collection of poems which breathe an Epicurean spirit, and while they occupy themselves with serious problems of life, do so with careless sportiveness, intent he on the enjoyment of the sensuous pleasures of life, like an easy-going Epicurean. The great problems of destiny don't trouble the author, they are no concern of his, and the burden of his songs assuredly is, as his translator says, "If not 'let us eat, let us drink, for to-morrow we die.'"

Omar Pasha, general in the Turkish army, was born an Austrian, his proper name Michael Lattas, and educated at the military school of Thurn; guilty of a breach of discipline, he ran away to Bosnia, turned Mohammedan, and henceforth threw in his lot with the Turks; he became writing-master to the Ottoman heir, Abdul-Medjid, and on the succession of the latter in 1839 was made a colonel; he was military governor of Lebanon in 1842, won distinction in suppressing rebellions in Albania, Bosnia, and Kurdistan, but his chief services were rendered in the Russian War; he successfully defended Kalafat in 1853, entered Bucharest in 1854, and defeated 40,000 Russians next year at Eupatoria in the Crimea; his capture of Cetinje, Montenegro, in 1862 was a difficult feat (1806-1871).

O'Meara, Barry Edward, a surgeon, born in Ireland, who accompanied Napoleon to St. Helena, and became his physician, having been surgeon on board the Bellerophon when the emperor surrendered himself; is remembered as the author of "A Voice from St. Helena; or, Napoleon in Exile," a book which from its charges against Sir Hudson Lowe created no small sensation on its appearance (1786-1836).

Ommiades, an Arab dynasty of 14 caliphs which reigned at Damascus from 661 to 720; dethroned by the Abassides, they were under Abder-Rahman I. welcomed in Spain, and they established themselves in Cordova, where they ruled from 756 to 1031.

Omnipresence, an attribute of the Divine Being as all-present in every section of space and moment of time throughout the universe.

Omphalë, a queen of Lydia, to whom Hercules was sold for three years for murdering Iphitus, and who so won his affection that he married her, and was content to spin her wool for her and wear the garments of a woman while she donned and wore his lion's skin.

Omsk (32), capital of Western Siberia, on the Om, at its confluence with the Irtish, 1800 m. E. of Moscow; is within the area of Russian colonisation, and has a military academy, Greek and Roman Catholic cathedrals, and large cattle trade; a number of its inhabitants are political exiles from Europe.

Onega, Lake, in the NW. of Russia, next to Ladoga the largest in Europe, nearly three times the size of Norfolkshire, being 140 m. long and 59 broad; has an irregular shore, deeply indented in the W., many inflowing rivers, but is drained only by the Swir; ice-bound for four months, there is busy traffic the rest of the year; navigation is promoted by canals, but hindered by many reefs; fish abound in the waters.

Onomatopoeia, formations of words resembling in sound that of the things denoted by them.

Ontario (2,114), third largest, most populous, richest, and most important province of Canada, lies N. of the great lakes between Quebec and Manitoba, and is thrice the size of Great Britain; the surface is mostly undulating; there are many small lakes, the chief rivers flow eastward to join the Ottawa; agriculture is the chief industry, enormous crops of wheat, maize, and other cereals are raised; stock-rearing and dairy-farming are important; the climate is subject to less extremes than that of Quebec, but the winter is still severe; there are rich mineral deposits, especially of iron, copper, lead, and silver, petroleum and salt; manufactures of agricultural implements, hardware, textiles, and leather are carried on; Toronto (181) is the largest town, Ottawa (44) is the capital of the Dominion, Hamilton (49) an important railway centre; the prosperity of the province is largely promoted by the magnificent waterways, lakes, rivers, and canals with which it is furnished. Founded by loyalists from the United States after the Declaration of Independence, the province was constituted in 1791 as Upper Canada, united to Quebec or Lower Canada in 1840, it received its present name on the federation of Canada in 1867; education in it is free and well conducted; there are many colleges and universities; municipal and provincial government is enlightened and well organised; the prevalent religious faith is Protestant.

Ontario, Lake, in area almost equal to Wales, is the smallest and easternmost of the five great lakes of the St. Lawrence Basin, North America; it lies between the province of Ontario, Canada, and New York State; receives the Niagara River in the SW., several streams on both sides, and issues in the St. Lawrence in the NE.; on its shores stand Hamilton, Toronto, and Kingston on the N., and Oswego on the S.; canals connect it with Lake Erie and the Hudson River, and it is a busy and always open highway of commerce.

Ontology, another name for metaphysics (q. v.) or the science of pure being, being at its living source in spirit or God, or Nature viewed as divine, especially as the ground of the spiritual in man and giving substantive being to him.

Onyx, a variety of agate or chalcedony, in which occur even layers of white and black or white and brown, sharply defined in good specimens; they come from India, and are highly valued for cameo-cutting.

Oosterzee, Jan Jakob van, a theologian of the Dutch Church, born at Rotterdam; became professor at Utrecht, wrote several theological and exegetical works on evangelical lines (1817-1882).

Opal, a variety of quartz, of which the finest kind, precious opal, is translucent, with blue or yellow tint, and when polished with a convex surface shows an admirable play of colours; it is found chiefly at Cerwenitza, Austria.

Open Secret, The, the secret that lies open to all, but is seen into and understood by only few, applied especially to the mystery of the life, the spiritual life, which is the possession of all.

Open, Sesamë, the magic formula the pronunciation of which opened the robbers' stronghold in the "Arabian Nights."

Opera, a drama set to music and acted and sung to the accompaniment of a full orchestra, of which there are several kinds according as they are grave, comic, or romantic.

Opera Bouffe, an opera in an extravagant burlesque style, with characters, music, and other accompaniments to match; is the creation of Offenbach (q. v.), his more distinguished successors in the production of which have been Lecocq, Hervé, and Strauss.

Ophelia, the daughter of Polonius in "Hamlet" and in love with the lord, but whose heart, from the succession of shocks it receives, is shattered and broken.

Ophicleide, a keyed brass wind instrument of recent invention, of great compass and power, and of which there are two kinds in use.

Ophir, a region in the East of uncertain situation, frequently referred to in Scripture as a region from which gold and precious stones were imported.

Ophites, a sect of Gnostics who regarded the serpent as a benefactor of the race in having persuaded Eve to eat of the tree of the knowledge of good and evil in disregard, or rather in defiance, of the warning of the God of the Jews.

Opie, John, English artist, born near Truro, Cornwall; began to learn his father's trade of carpenter, but turning to art went with Dr. Wolcott to London in 1780; for a year he had phenomenal success as a portrait-painter; on the wane of his popularity he turned to scriptural and historical painting and to illustration; after being Associate for a year he was elected Academician in 1787; besides some lectures on art, he wrote a Life of Reynolds and other works (1761-1807).

Opinicus, a fabulous winged creature with the head of a griffin, the body of a lion, and the tail of a camel; a heraldic symbol.

Opitz, Martin von, a German poet, born in Silesia; was much patronised by the princes of Germany; was crowned with laurel, and ennobled by Ferdinand II.; his poetry was agreeable to classic models, but at the expense of soul, though, to his credit it must be said, the German language and German poetry owe him a deep debt (1597-1639).

Oporto (140), at the mouth of the Douro, 200 m. N. of Lisbon, the chief manufacturing city of Portugal, and second in commercial importance; is the head-quarters of the trade in port wine; the industries include cloth, silk, hat, and porcelain manufacture, tobacco, metal-casting, and tanning; besides wine it exports cattle, fruit, cork, and copper. There are many old churches, schools, a library, and two picture-galleries.

Opportunist, name given to a politician whose policy it is to take advantage of, or be guided by, circumstances.

Optimism, the doctrine or belief that in the system of things all that happens, the undesirable no less than the desirable, is for the best.

Opus Operatum (i. e. the work wrought), a Latin phrase used to denote the spiritual effect in the performance of a religious rite which accrues from the virtue inherent in it, or by grace imparted to it, irrespectively of the administrator.

Oran (74), the busiest port in Algeria, is 260 m. W. of Algiers; it has a Roman Catholic cathedral, a mosque, a school, a college, and two castles, and exports esparto grass, iron ore, and cereals.

Orange River or Gariep, chief river of South Africa, rises in the eastern highlands of Basutoland, and flows 100 m. westward to the Atlantic, receiving the Vaal and the Caledon as tributaries, and having Cape Colony on the S. bank and the Orange Free State, Griqualand West, Bechuanaland, and German Namaqualand on the N.; a bar at the mouth and the aridity of its lower course make it unfit for navigation.

Orange River Colony, formerly Orange Free State (380), lying between the Vaal and the Orange Rivers, Griqualand West, and the Drakenberg Mountains; has an area nearly the size of England, with a healthy, temperate climate; undulating plains slope northward and southward, from which rise isolated hills called kopjes. The chief industries are the rearing of sheep, cattle, horses, and ostriches; coal-mining in the N. and diamond-seeking in the SW.; the exports comprise wool, hides, and diamonds. Founded by Dutch Boers from Natal, it was annexed by Britain in 1848, but granted independence in 1854. The capital, Bloemfontein (3), is connected by a railway with Johannesberg and with the Cape. Having made common cause with the South African Republic in the Boer War, it was annexed by Great Britain in 1900. At present (1905) it is under the supreme authority of the Governor of Orange River and the Transvaal Colonies, assisted by a Lieutenant-Governor and an Executive Council.

Orangemen, a name given to an association of Protestants in Ireland instituted to uphold the Protestant succession to the crown, and the Protestant religion as settled at the Revolution of 1688, and which derives this name from William, the Prince of Orange, on whose accession to the throne Protestantism was established; it became dormant for a time after its institution, but it has shown very decided signs of life at political crises when Protestantism seemed in danger, such as often to call for some firm handling.

Oratorio, a musical composition on a sacred theme, dramatic in form and associated with orchestral accompaniments, but without scenic accessories; it derives its name from the oratory of St. Philip Neri at Rome, in which a composition of the kind was first performed, and was a musical development of the miracle plays (q. v.).

Oratory, Congregation of the, community of secular priests formed by St. Philip of Neri (q. v.), and bound by no religious vow, each one of which is independent of the others; it consists of novices, triennial fathers, decennial fathers, and a superior, their functions being to preach and hear confession.

Orcagna, a Florentine painter, sculptor, and architect, did several frescoes; was architect of the cathedral of Orviëto; his masterpiece an absolutely unique marble tabernacle in the church of Or San Michele, Florence (1329-1389).

Orchardson, William Quiller, English genre-painter, born in Edinburgh; his pictures are numerous, and among the best and most popular, "The Challenge," "The Queen of the Woods," "On Board the Bellerophon," "The Mariage de Convenance"; b. 1835.

Orcus (i. e. place of confinement), another name for Hades, or the "World of the Dead"; also of the god of the nether world.

Ordeal, a test by fire, water, poison, wager of battle, or the like, of the innocence or guilt of persons in appeal thereby to the judgment of God in default of other evidence, on the superstitious belief that by means of it God would interfere to acquit the innocent and condemn the guilty, a test very often had recourse to among savage or half-civilised nations.

Ordericus Vitalis, a mediæval chronicler, born near Shrewsbury; was a monk of the Abbey of St. Evreul, in Normandy; wrote an ecclesiastical history of Normandy and England—a veracious document, though an incondite; d. 1143.

Orders in Council are issued by the British Sovereign, with the advice of the Privy Council, and within limits defined by Parliament. In cases of emergency these limits have been disregarded, and Parliament subsequently asked to homologate the action by granting an indemnity to those concerned.

Oreades in the Greek mythology nymphs of the mountains, with special names appropriate to the district they severally inhabit.

Oregon (314), one of the United States, on the Pacific seaboard, with Washington, Idaho, Nevada, and California on its inland borders, nearly twice the size of England, has the Coast Mountains along the W., the Cascade range parallel 60 m. E., and 70 farther E. the Blue Mountains. The centre and E. is hilly, and affords excellent grazing and dairy-farming ground; the western or Willamette Valley is arable, producing cereals, potatoes, tobacco, hops, and fruit. Between the Coast Mountains and the sea excessive rains fall. The State is rich in timber, coal, iron, gold, and silver; and the rivers (of which the Columbia on the N. border is the chief) abound in salmon. Owing to the mountain shelter and the Japanese ocean currents the climate is mild. The capital is Salem (4), the largest city Portland (46), both on the Willamette River. The State offers excellent educational facilities; it has 17 libraries, many schools and colleges, and the Blue Mountain University. The State (constituted in 1859) forms part of the territory long in dispute between Great Britain and the United States. It was occupied jointly from 1818 to 1846, when a compromise fixed the present boundary of British Columbia.

Orelli, Conrad von, theologian, born at Zurich; professor at Basel; has written commentaries on Isaiah, Jeremiah, Ezekiel, and the minor prophets; b. 1846.

Orelli, Johann Kaspar von, a Swiss scholar, born at Zurich, where he was professor of Classical Philology; edited editions of the classics, particularly Horace, Tacitus, and Cicero, highly esteemed for the scholarship they show and the critical judgment (1787-1849).

Orestes, the son of Agamemnon and Clytemnestra, and brother of Electra and Iphigenia, who killed his mother to avenge the murder by her of his father and went mad afterwards, but was acquitted by the Areopagus and became king of Argos and Lacedæmon; his friendship for Pylades, who married his sister Electra, has passed into a proverb; the tragic story is a favourite theme of the Greek tragedians.

Orfila, M. J. Bonaventure, French chemist and physician, born in Minorca; mainly distinguished for his works on toxicology (1787-1853).

Organism, a structure instinct with life, and possessed of organs that discharge functions subordinate and ministrative to the life of the whole.

Organon, a term adopted by Bacon to denote a system of rules for the regulation of scientific inquiry.

Orgies, festivals among the Greeks and Orientals generally connected with the worship of nature divinities, in particular Demeter (q. v.), Dionysos (q. v.), and the Cabiri, celebrated with mystic rites and much licentious behaviour.

Oriflamme (i. e. flame of gold), the ancient banner of the kings of France, borne before them as they marched to war; it was a red flag mounted on a gilded staff, was originally the banner of the abbey of St. Denis, and first assumed as the royal standard by Louis VI. as he marched at the head of his army against the Emperor Henry V. in 1124, but one hears no more of it after the battle of Agincourt in 1415, much as it was at one time regarded as the banner of the very Lord of Hosts.

Origen, one of the most eminent of the Fathers of the Church, born at Alexandria it is presumed, the son of a Christian who suffered martyrdom under Severus, whom he honoured and ever reverenced for his faith in Christ; studied the Greek philosophers that he might familiarise himself with their standpoint in contrast with that of the Christian; taught in Alexandria and elsewhere the religion he had inherited from his father, but was not sufficiently regardful of episcopal authority, and after being ordained by another bishop than that of his own diocese was deposed and banished; after this he settled in Cæsarea, set up a celebrated school, and had Gregory Thaumaturgus for a pupil, whence he made journeys to other parts but under much persecution, and died at Tyre; he wrote numerous works, apologetical and exegetical as well as doctrinal, besides a "Hexapla," a great source of textual criticism, being a work in which the Hebrew Scriptures and five Greek versions of them are arranged side by side; in his exegesis he had a fancy for allegorical interpretation, in which he frequently indulged, but in doing so he was entitled to some license, seeing he was a man who constantly lived in close communion with the Unseen Author of all truth (185-253).

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 Parimé 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.