an insulated rock on the western coast of Scotland, between the shores of Ayrshire and Cantyre. It is of a conoidal form, with an irregular elliptic base, and rises abruptly from the sea to the height of 1139 feet. Its area is estimated by Macculloch at 3900 by 2200 feet. The only part at which the rock can be ascended is on the east side, where there is a spit of rolled pebbles; the other sides are insurmountable, and for the most part perpendicular. The south-west and north-west are perpendicular, and generally present grand columnar forms, which, though not so regular as those of Staffa, are far more lofty, and in some parts are about 400 feet high. The rock is a greenstone or syenite, with a basis of grayish compact felspar, with small grains of quartz and hornblende. There is no difference between the columnar and massive portions of the rock; but it is traversed by numerous trap veins. A fine columnar cave of 50 feet by 12 feet, and 30 feet high, exists towards the north end. About one-fifth up on the east side are the remains of a tower, with several vaulted rooms. The ascent is laborious, as the fragments of rock are interspersed with the tall vegetation of the common nettle, of *Lychnis dioica*, and *Silene amara*. Two springs occur on the eastern slopes, where *Hydrocyste vulgaris* grows to a great size. The scanty grass affords subsistence to a few goats and numerous rabbits; but the rocks are the favourite abode of innumerable gannets, gulls, puffins, and auks. Lat. 55° 15', 13° N. Long. 5° 7', W.