“Others, again, may have been intended as fortresses on which the people might seek refuge from an enemy. Many, no doubt, remain that are quite enigmatical. Several, when opened, are found to contain passages and cells, of which it is difficult to guess what use they were intended for. They are too small for storehouses, and can scarcely have served as tombs, or bones and other remains would have been found there. “Lisserdowling, a high pyramid surrounded by a low rampart and ditch, is more likely, in my opinion, to have been erected as a religious monument than as a fortress. Had it been intended for a fortress, why should so much labour have been expended in giving it a conical form, and why not have bestowed more pains on the circumvallation. As a fortress it would have been the strangest and most ineligible that could have been built. The space on the summit would scarcely afford room for two huts, and when the ramparts had once been stormed by the enemy, the defenders would have been at the greatest disadvantage on the sides of the cone. “Probably the circumvallation has led to the belief that this, and many other tumuli, were intended for fortresses; but Stonehenge, which nobody ever took to be a fortress, is also surrounded by rampart and ditch. The circumvallation may have been intended simply to mark the boundary of the holy place, and to cut off all connection with the profane part of the world.” These ruins which Mr. Kohl has described, and respecting which he has given his opinion, are simply the remains of ancient granaries or pyramids, erected by the Phenicians, who left them standing when they returned to their own country. After the departure of these Phenicians, Ireland was visited by the Moors, who were masters of Spain and Portugal. These Moors coming from the coast of Africa, opposite Spain, were a colony formerly from the heart of Negroland, whence they reached the coast by way of the great desert called the Sahara, and joined their countrymen who had already settled in the new empire called Mauritania, which comprised Morocco and Tunis, &c., of our time. These new visitors erected the round towers, in which to stack corn, just as their predecessors had constructed the Pyramids for a like purpose. There are round granaries in Africa, constructed with materials procurable in the place; but in Ireland they used stone instead, which was more durable, although retaining the same form as in the prototypes. The following is what Kohl says about the round towers:—