and railroad, uniting Pittsburg and Philadelphia.
A railroad is also in operation from Baltimore
as far as Cumberland, which is to cross the Al-
leghanies to Wheeling.
Ohiopyle Falls, Pa. This cataract is at the
head of boat navigation in Youghiogeny Eiver,
where it passes Laurel Hill, 60 miles above its
junction with the Monongahela. The river falls
perpendicularly about 20 feet, and there is a total
descent of 60 feet in the space of a mile.
Oil Creek, Pa., derives its name from a spring
on its bank, near the boundary between Yenango
and Crawford counties, on the surface of which
floats an oil valuable for medicinal purposes.
The creek enters Alleghany Eiver 8 miles E. of
Oil Creek, Perry co., Ia. A small stream flow-
ing into Ohio Eiver.
Oil Spring Creek, N. Y., rises in Alleghany and
Cattaraugus counties, and flows S. W. into the
Oil Spring Reservation, N. Y. This is an In-
dian reservation of about 1 mile square, contain-
ing a pool of water, the surface of which is cov-
ered with an oily substance much used for the
cure of sores and chronic diseases in man and
beast. It lies in the towns of Cuba and Hins-
dale. See Oil Creek, Pa.
Okabena Lake, Ma. Situated in the S. part of
the territory W. from the Moingonan Eiver.
Okaman Lake, Ma. It lies at the head of
Leseur Eiver, and S. E. from Ochopah Lake.
Okamenpiden Lake. Situated on the boundary
of Io. and Ma.
Okanoxubee River, Mi. and Aa. This river is
formed in Mi. by the junction of the Noxubee
Eiver, Dancing Eabbit, Horse Hunter, and other
creeks. It flows S. E. into Aa., and enters the
Tombigbee at Gainesville. *
Okeechobee or Macaco Lake, Fa. This large
lake lies mostly in St. Lucie co., to the N. of the
Everglades. It receives the waters of Kissimee
Eiver on the N., and Fish Eating Creek on the
W.. and contains several islands.
Okonagan River. This river rises principally in
the British possessions, flows in a S. direction,
and empties into Clark's Fork of Columbia Eiver,
Old Caney Creek, Ts., empties into the Gulf of
Mexico a little E. from Mattagorda Bay.
Old Field Point, N. Y., is situated in the town
of Brookhaven, Suffolk co., on the N. side of
Long Island. On it is located a light-house.
Old Man's Kill, N. Y., rises in Plattekill,
Ulster eo., flows E. through Marlboro' into the
Old Plantation Creek, Northampton co., Ya.
A small inlet communicating with Chesapeake
Old Point Comfort, Elizabeth City co., Va.
Situated between Chesapeake Bay on the E. and
Hampton Eoads on the W.
Old Topsail Inlet, Carteret co., N. C. A pas-
sage between the islands in the N. E. part of
Oliverian River, N. H., is formed of two branch-
es, both having their sources in the town of Ben-
ton : the E. branch from the W. side of Moose-
hillock Mountain, and the N. branch from Owl's
Head Mountain. These branches unite near the
E. line of the town of Haverhill, and the main
stream passes through the S. part of the town,
and falls into the Connecticut.
Olympus, Mount, On. Situated in the N. W.
part of the state, S. from the Straits of Juan do
Ompompanoosuck River, Yt., rises in the N. W.
part of Vershire, and runs E. into West Fairlee.
It then takes a S. E. course into Thetford, where
it receives a stream from Fairlee Lake, which is
a large body of water lying partly in Fairlee and
partly in Thetford. In the S. part of Thetford
it receives a considerable stream from the W.,
which originates in Tunbridge and Strafford, and
it finally mingles with the Connecticut in the
N. E. part of Norwich. The whole length of
the Ompompanoosuck is about 20 miles, and it
affords a number of valuable mill sites. The
name, which is Indian, is said to signify a stream
where many onions are found.
One Hundred and Two River, Mo. This stream
waters the S. interior of Nodowry co., flows S.,
and empties in the Little Platte Eiver in Bu-
Oneida Creek, N. Y., rises in Madison co., flows
N. W., dividing Madison and Oneida counties,
and empties into Oneida Lake. This river and
its tributaries afford a number of good mill sites.
It is also a feeder to the Erie Canal. Vessels
ascend it to the village of Oneida Castle, a dis-
tance of 3 miles.
Oneida Lake, N. Y., is bounded by Oneida,
Madison, Onondaga, and Oswego counties. It
is 22 miles long, and from 4 to 6 wide. Wood,
Oneida, and Chittenango Creeks, besides several
smaller streams, flow into it. There is a fine
shelving beach on the E. end, which is much
resorted to for fishing with seines. White fish,
pickerel, pike, perch, and catfish are taken in
Oneida River, N. Y., formed by the outlet of
Oneida Lake, flows 20 miles in a circuitous W.
direction, and unites with the Seneca Eiver. The
united streams then take the name of Oswego
Eiver, which flows N. into Lake Ontario.
Onion River, Yt. See Winooski River.
Onion River, Sheboygan co., Wn. It rises in
the W. interior of the county, flows S. E. nearly
to its S. border, and then flows N. N. E. until its
entrance into Sheboygan Eiver.
Onondaga Creek, Onondaga co., N. Y., flows
N. into the lake of the same name.
Onondaga Lake lies in the N. part of Onondaga
co., N. Y. It is 8 miles long, and from 2 to 4
miles wide, and abounds in pickerel, pike, bass,
and catfish. The number of salt springs on its
borders have led to the supposition that the wa-
ter at the bottom of this lake was salt, but exper-
iments to the contrary have since been made.
Onslow Bay, N. C., is a portion of the Atlantic
contained within the curve between Cape Fear
and Cape Lookout. A chain of long, narrow
islands, with inlets between them, stretches along
the shore, at a distance of 1 or 2 miles from it.
Ontario, Lake. One of the chain of the great
American lakes, lying between the state of New
York and Canada. This is the easternmost and
smallest in extent of the series. It is 190 miles
long, with an average width of 40 miles. Its great-
est width is 55 miles. Its circumference is 480
miles. It is very deep in every part, varying from
500 to 600 feet, so that its bottom is considerably
below the surface of the Atlantic. Its surface is
334 feet below that of Lake Erie, from which,
through the Niagara Eiver, or Strait, it receives the
waters of all the great upper lakes, at its western