One of his favourite anchorages has been Loch Roag, on the west side of Lewis, where the typical scenery of these islands is well displayed--a hummocky surface of rounded rocky knolls, separated by innumerable lakelets and boggy or peaty hollows, or green crofter-holdings, the land projecting seawards in many little promontories, and the sea sprinkled with islets. On one of the cruises, we landed and examined with some care the famous stones of Callernish--the most numerous group of standing stones in the British Islands. Seen from the sea on a grey misty day, they look like a company of stoled carlines met in council. On a near view, they are found to be disposed in the figure of a cross and circle, the longer limb of the cross being directed about ten degrees east of north. The monoliths consist of between 40 and 50 slabs of flaggy gneiss, the largest being 17 to 18 feet in height. It was interesting to observe that after the purpose for which they were erected had perhaps been forgotten, boggy vegetation began to spread over the ground and form a layer of peat, which, in the course of centuries, increased to a depth of six feet or more; the lower portions of the upright monoliths were thus buried in the peat. The late proprietor had this vegetable growth removed, so as to lay bare the original surface of the ground; but the upper limit of the turbary could still be traced in the bleached aspect of that lower part of the stones which had been covered by the peat, the organic acids of the decaying vegetation having removed much of the colouring material of the gneiss. How long this accumulation of peat took to form must be matter for conjecture.