er over the adjacent lands, when forced
through a perforation in a rocky shore; both its egress and ingress are
attended with a rumbling noise, and the spray is often very injurious to
the surrounding vegetation.

SEA-STAR. A common rayed or star-like animal, belonging to the class
_Echinodermata_. Also called _star-fish_ (_Asteria_).

SEA-STREAM. In polar parlance, is when a collection of bay-ice is
exposed on one side to the ocean, and affords shelter from the sea to
whatever is within it.

SEA-SWABBER. A reproachful term for an idle sailor.

SEA-SWALLOW. The tern, a bird resembling the gull, but more slender and
swift.

SEA-SWINE. The porpoise.

SEAT. A term often applied to the peculiar summit of a mountain, as the
Queen of Spain's Seat near Gibraltar, the Bibi of Mahratta's Seat near
Bombay, Arthur's Seat at Edinburgh, &c.

SEA-TANG. Tangle, a sea-weed.

SEAT-LOCKERS. Accommodations fitted in the cabins of merchantmen for
sitting upon, and stowing cabin-stores in.

SEAT OF WATER. Applies to the line on which a vessel sits.

SEA-TRANSOM. That which is bolted to the counter-timbers, above the
upper, at the height of the port-sills.

SEA-TURN. A tack into the offing.

SEA-URCHIN. The _Echinus_, an animal of the class _Echinodermata_, of
globular form, and a hard calcareous outer covering, beset with movable
spines, on the ends of which it crawls about.

SEA-WALLS. Elevations of stones, stakes, and other material, to prevent
inundations.

SEA-WARD. Towards the sea, or offing.

SEA-WARE. The sea-weed thrown up by surges on a beach.

SEA-WATER. "The quantity of solid matter varies considerably in
different seas, but we may assume that the average quantity of saline
matter is 3-1/2 per cent., and the density about 1.0274" (_Pereira_).
The composition of the water of the English Channel according to
Schweitzer is--

Grains.
Water 964.74372
Chloride of Sodium 27.05948
" Potassium 0.76552
" Magnesium 3.66658
Bromide of Magnesium 0.02929
Sulphate of Magnesia 2.29578
" Lime 1.40662
Carbonate of Lime 0.03301
----------
1000.00000

SEA-WAY. The progress of a ship through the waves. Also, said when a
vessel is in an open place where the sea is rolling heavily.

SEA-WAY MEASURER. A kind of