[O'Groat's House, John]. See [John o' Groat's House].
[Ogyges], a Boeotian autochthon, the legendary first king of Thebes, which is called at times Ogygia, in whose reign a flood, called the Ogygian after him, inundated the land, though some accounts make it occur in Attica.
[Ogygia], a mythological island of Homeric legend, situated far off in the sea, and the home of the sorceress [Calypso] (q. v.).
[Ohio] (3,672), a State of the American Union, a third larger than Scotland, stretches northward from the Ohio River to Lake Erie, between Pennsylvania and Indiana. It consists of level and undulating plains, on which are raised enormous crops of wheat and maize. Sheep-grazing and cattle-rearing are very extensive; its wool-clip is the largest in America. There are valuable deposits of limestone and freestone, and in output of coal Ohio ranks third of the States. The manufactures are very important; it ranks first in farm implements, and produces also wagons, textile fabrics, and liquors. In the N. excellent fruit is grown. The capital is Columbus (88), the largest city is Cincinnati (297). Admitted to the Union in 1803, it boasts among its sons four Presidents—Grant, Hayes, Garfield, and Benjamin Harrison.
[Ohio River], formed by the confluence of the Alleghany and the Monongahela, pursues a westward course of 1000 m., separating Ohio, Indiana, and Illinois from West Virginia and Kentucky, and after receiving sundry tributaries joins the Mississippi, being the largest and, next to the Missouri, the longest of its affluents; it is navigable for the whole of its course; on its banks stand Pittsburg, Cincinnati, Louisville, and Madison.
[Ohm, Georg Simon], a German physicist, born at Erlangen; discovered the mathematical theory of the electric current, known as Ohm's Law, a law based on experiment, that the strength of the electric current is equal to the electro-motive force divided by the resistance of the wire (1787-1854).
[Ohnet, Georges], French novelist, born in Paris; author of a series of novels in a social interest, entitled "Les Batailles de la Vie;" b. 1848.
[Oil City] (11), on the Alleghany River, Pennsylvania, by rail 130 m. N. of Pittsburg, is the centre of a great oil-trade and oil-refining industry; there are also engineer and boiler works; it suffered severely from floods in 1892.
[Oka], a river of Central Russia, which rises in Orel and flows N., then E., then N. again, joining the Volga at Nijni-Novgorod after a course of over 700 m., navigable nearly all the way; on its banks are Orel, Kaluga, and Riazan, while Moscow stands on an affluent.
[Oken, Lorenz], German naturalist; was professor first at Jena, then at Münich, and finally at Zurich, his settlement in the latter being due to the disfavour with which his political opinions, published in a journal of his called the Iris, were received in Germany; much of his scientific doctrine was deduced from a transcendental standpoint or by a priori reasonings; is mentioned in "Sartor" as one with whom Teufelsdröck in his early speculations had some affinity (1779-1851).