Orlemais, an ancient province of France, near the centre of the country, bounded N. E. by He de France, E. by Champagne and Burgundy, S. by Berry, W. by Touraine, Maine, and Perche, and N. W. by Normandy. Besides Orléanais proper, it included the districts of Blaisois, Vendomois, Dunois, Sologne, Gâti-nais, Beauce or Pays Chartrain, and Perche-Gouet. It was originally the country of the Carnutes and Senones. It was watered by the Loire, Loiret, Loir, Eure, Cher, Beuvron, Yonne, Essonne, and Loing. It has been divided into the three departments of Loir-et-Cher, Eure-et-Loir, and Loiret.


Ormsby, a W. county of Nevada, separated from California on the west by Lake Tahoe; area, 172 sq. m.; pop. in 1870, 3,668, of whom 769 were Chinese. It embraces a portion of the valley of Carson river, locally known as Eagle valley, containing many fine farms and gardens. In the E. part is the Nut Pine range, once covered with valuable wood; the W. part is crossed by one of the ridges of the Sierra Nevada, which is covered with pine. Silver, copper, and iron arc found, but the mines have been little developed. Limestone and freestone are quarried. The chief productions in 1870 were 3,705 bushels of wheat, 1,245 of Indian corn, 2,270 of oats, 9,320 of barley, 22,947 of potatoes, and 901 tons of hay. The value of live stock was $77,968. There were 2 planing mills, 4 saw mills, 6 quartz mills, a brewery, and a soap and candle factory. Capital, Carson City, which is also the capital of the state.


Orne, a N. W. department of France, in Normandy, bordering on Calvados, Eure, Eure-et-Loir, Sarthe, Mayenne, and LaManche; area, 2,354 sq. m.; pop. in 1872, 398,250. The chief rivers are the Orne, Eure, Sarthe, and Mayenne; there are many ponds and marshes. The soil is generally sandy. Iron, plumbago, and granite are produced. Hemp, fruit, cattle, and poultry are raised, and needles, linens, cottons, and lace are manufactured. It is divided into the arrondissernents of Alencon, Argentan, Dom-front, and Mortagne. Capital, Alencon.


See Fossil Footprints.


Ornithosaurians, extinct flying reptiles of the mesozoic age. (See Pterodactyl).


Oromes, a river of Syria, which rises not far from Baalbek in Ccele-Syria, flows N. between the Lebanon and Anti-Lebanon, and through the plains of northern Syria, passing Horns (ancient Emesa) and Hamah (Hamath or Epiphania), and then turning "W. into the valley of Antioch, falls into the Mediterranean near lat. 36° N. It is about 250 m. long, and remarkably picturesque between Antioch and the sea. Its Arab name is Nahr el-Aasy.


See Coloxsay.


See Urumiah.


See Arafat.


See Sedum.


Orrery, a machine representing the motions of the planetary bodies. Distinct names have been given to various modifications of it: the planetarium, which exhibits the orbital paths of the planets and their satellites; the tellurium, which shows the motions of the earth causing day and night, the seasons, and the variable length of the former as dependent upon the latter; the lunarium, which shows the motions of the moon; and the satellite machine, chiefly intended to represent the motions of Jupiter and his satellites. The ordinary orrery was invented by George Graham about 1715, and first patronized by the earl of Orrery.