ory; in the dry season its volume is much
diminished, and its many sandbanks prevent its navigation except by small
boats.

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 floo