hewn out in the lofty cliff which overhangs the Teviot, has in its sides similar recesses, and from their supposed resemblance to the interior of a pigeon-house, the cavern has received the name of the _Doo-cave_. Authentic notices of the Hawthornden caves occur so early as the reign of David II., when a daring band of Scottish adventurers made good their head-quarters there, while Edward held the newly fortified castle of Edinburgh, and the whole surrounding district. In the glen of the little river Ale, which falls into the Teviot at Ancrum, extensive groups of caves occur, all indicating, more or less, artificial adaptation, as human dwellings; and in many other districts similar evidences may be seen of temporary or permanent habitation, at some remote period, in these rude recesses. Along the coast of Arran there are several caves of various dimensions, one of which, at Drumandruin, or Drumidoon, is noted in the older traditions of the island as the lodging of Fin M'Coul, the Fingal of Ossian, during his residence in Arran. Though low in the roof, it is sufficiently capacious for a hundred men to sit or lie in it. In this, as in the previous example, we find evidences of artificial operations, proving its connexion with races long posterior to those with whose works we have chiefly to do in this section of archæological inquiry. In the further end a large detached column of rock has a two-handed sword engraved on it, surmounted by a deer, and on the southern side of the cave a lunar figure is cut, similar in character to those frequently found on the sculptured pillars and crosses which abound in Scotland. It is now more frequently styled the king's cave, and described as the retreat of Robert the Bruce, while he lurked as a fugitive in the Western Isles; but like many other traditions of the Bruce this seems to be of very recent origin. Other caves in the same island are also of large dimensions, and variously associated with popular traditions, as, indeed, is generally the case wherever subterranean retreats of any considerable extent occur. Some are the supposed dwellings of old mythic chiefs, whose names still live in the traditional songs of the Gael. Others are the retreats which the primitive confessors of Scotland excavated or enlarged for their oratories or cells. Of the latter class are the caves of St. Molio, on the little island of Lamlash, or the Holy Isle, on the east coast of Arran; of St. Columba and St. Cormac, on the Argyleshire coast; of St. Ninian, in Wigtonshire; of St. Serf, at Dysart, on the Fifeshire coast; and the celebrated "ocean cave" of St. Rule, in St. Andrew's Bay. This last oratory consists of two chambers hewn out of the sandstone cliffs of that exposed coast. The inner apartment is a plain cell, entered from the supposed oratory of the Greek saint. The latter is nearly circular, measuring about ten feet in diameter, and has a stone altar left hewn in the solid rock on its eastern side.