this situation there must have been some general reason, which the change of manners has left in obscurity. They were of no use in the days of piracy, as defences of the coast; for it was equally accessible in other places. Had they been sea-marks or light-houses, they would have been of more use to the invader than the natives, who could want no such directions of their own waters: for a watch-tower, a cottage on a hill would have been better, as it would have commanded a wider view.
If they be considered merely as places of retreat, the situation seems not well chosen; for the Laird of an Island is safest from foreign enemies in the center; on the coast he might be more suddenly surprised than in the inland parts; and the invaders, if their enterprise miscarried, might more easily retreat. Some convenience, however, whatever it was, their position on the shore afforded; for uniformity of prac-tice
