The Harbour of Swansea is capacious,--well constructed, defended by two strong stone piers, about eighteen hundred feet in length,--and affords accommodation to a great many trading-vessels. On the west pier, a light-house and watch-tower offer additional security to the shipping; and every facility is provided for lading and unlading. The tide flows a considerable way up the river, which is navigable to the extent of two miles for vessels of burden. The canal, running parallel with the river, extends to Brecknockshire, a distance of sixteen miles; and in its course passes through thirty-six locks, and over several aqueducts. Its head is nearly four hundred feet higher than its mouth, which readily accounts for the great number of locks. There is also a canal from the Swansea to the Neath canal, on which a packet-boat is established, and a _tram_-road from the former to Oystermouth. With Bristol and Ilfracombe there is a regular communication kept up by means of steam-vessels, which leave and arrive according to the state of the tide. The public buildings of Swansea--ancient and modern--are numerous in proportion to the population. The Town-hall, erected in 1829, is an elegant structure, approached by two flights of steps, and adorned with columns of the Doric order. The castle, situated nearly in the centre of the town, was originally a building of great extent, and of a strength well suited to the purposes of its erection. A massive tower, surmounted by a range of light arches which support a parapet, is the principal part now remaining of this once redoubtable fortress. It appears to have been founded at the remote epoch of 1113, by Henry Beaumont, Earl of Warwick,--a Norman leader who conquered Gowerland; but being soon after laid siege to by a Welsh chief,--Griffith ap Rhys ap Theodore,--a considerable portion of the outworks was destroyed. It is now in the possession of the Duke of Beaufort, "Earl" of Glamorgan, who is hereditarily entitled to the "prisage and butlerage" of all wines brought into the harbours of Swansea and Chepstow. The public rooms of Swansea stand on the north side of the promenade, called the Burrows, which consist of several acres tastefully laid out in parterres. Here also are an excellent House of Industry and an Infirmary, established in 1817 and situated on the beach. Besides the free Grammar-school, founded in the seventeenth century, by Hugh, Bishop of Waterford and Lismore, there are the Lancasterian and National-schools, which are incalculable blessings to the increasing population of Swansea. [Illustration: OYSTERMOUTH, (Swansea Bay.)] OYSTERMOUTH CASTLE.