The bold promontory of the Mumbles, which bounds Swansea Bay to the westward, has become a popular watering-place, into which it has gradually developed from the fishing-village nestling under Oystermouth Castle. The bay was once a great producer of oysters, and dredging for them was the chief industry of the inhabitants. The remains of the castle stand upon a knoll overlooking the sea, and with higher hills behind. The Duke of Beaufort, to whom it belongs, keeps the ruins carefully protected, and they are in rather good preservation. The plan is polygonal, approaching a triangle, with its apex towards the sea, where was the only entrance, a gateway guarded by two round towers, of which only the inner face now remains. The interior court is small, with the keep at the north-eastern angle, having a chapel at the top. There are some other apartments with vaulted chambers underground. Henry de Bellamont is believed to have built this fortress at about the time of the construction of Swansea Castle, but it has not contributed much to history, though now a picturesque ruin. [Illustration: OYSTERMOUTH CASTLE.] On the eastern side of Swansea Bay enters the Vale of Neath, where is also a manufacturing town of rapid growth, while within the Vale is beautiful scenery. Neath is of great antiquity, having been the Nidum of the days of Antoninus. At the Crumlyn Bog, where white lilies blossom on the site of an ancient lake, legend says is entombed a primitive city, in proof whereof strains of unearthly music may be occasionally heard issuing from beneath the waters. In the valley on the western bank of the river are the extensive ruins of Neath Abbey, said once to have been the fairest in all Wales. This religious house was founded by Richard de Granville in the twelfth century, but its present buildings are of later date. Within its walls Edward II. took refuge when he escaped from Caerphilly, for it had the privilege of sanctuary; but after leaving Neath a faithless monk betrayed him, and he was put to death most cruelly at Berkeley Castle. Only a ruined gateway remains of Neath Castle, blackened by the smoke of smelting-works. [Illustration: NEATH ABBEY.] CAERMARTHEN AND PEMBROKE.