Oglio (anc. Ollius), a river of northern Italy, flowing through Lombardy. It rises in the Rhaetian Alps at the foot of Mount Tonale, in the N. E. part of the province of Bergamo, flows S. W. and afterward S. E., passes through Lake Iseo, and afterward separating the provinces of Bergamo and Cremona from those of Brescia and Mantua, and receiving the waters of the Mella and the Chiese from the north, joins the Po near Borgoforte, and 10 m. S. w. of Mantua. It is about 150 m. long.


Ogtges, a mythical king of Greece. During his reign occurred the deluge which is called after him the Ogygian. According to one tradition, he was the son of Boeotus, was king of the Hectenes, and the first ruler of Bceotia, which was named from him Ogygia. The oldest gate of Thebes was called the Ogygian gate. He is likewise described as king of Attica, and father of Eleusis and also of Dseira. By Strabo and Folybius he is spoken of as the last king of Achaia, and according to some legends he was an Egyptian monarch.

Ohoes, Or Ottoes

Ohoes, Or Ottoes, an Indian tribe on the Missouri river, known to the French from about 1673 under the name of Otontanta, and calling themselves Watoohtahtah, They belong to the Dakota family, were originally part of the Missouris, and claim to have come into those parts with the Winnebagoes. They long resided on the S. bank of the Platte in a permanent village of earth-covered huts. Treaties were made with them on June 24, 1817, and Sept. 26, 1825. They have for years been united with the Missouris, forming one village. The two tribes in 1873 numbered fewer than 500 souls, the Otoes still retaining their Indian dress, habits, and dwellings. Missions among them have not been successful.

Oil Of Vitriol

See Sulphuric Acid.


Oka, a river of central Russia, one of the principal affluents of the Volga. It rises about 40 m. S. of Orel, in the government of the same name, passes that town, and flowing with a swift current N., N. E., S. E., and N. E. through the governments of Tula and Kaluga, on the border of Moscow, and through Riazan, Tambov, Vladimir, and Nizhegorod, joins the Volga at the town of Nizhni-Novgorod. Its total course is about 800 m., almost all navigable.


Okanagans, a tribe of the Soushwap branch of the Selish family of American Indians, living on a river that bears their name in Washington territory, E. of the Cascade mountains. They were called Cutsanim by Lewis and Clarke, and have always been friendly. They cultivate some corn, wheat, and potatoes, but depend chiefly on fish, roots, and berries. They lost greatly by disease in 1830. Missions were established among them in 1846, when they numbered 685. They are now reduced to 340. They had a peculiar weapon like a slungshot, a cylinder with a round stone at the end, both sewed in leather. One end was fastened to the wrist when in use. They strapped their dead to trees.