which are formed by two pillars of equal height, joined by a superincumbent stone. Here weight alone was no longer considered sufficient for imparting strength and safety, but holes were worked in the upper stones, and the pointed tops of the pillars were fitted into them. In the slabs that form the cromlechs we find no such traces of careful workmanship; and this, as well as other considerations, would support the opinion, that in Stonehenge we have one of the latest specimens of Celtic architecture. Marvelous as are the remains of that primitive style of architectural art, the only real problem they offer is, how such large stones could have been brought together from a distance, and how such enormous weights could have been lifted up. The first question is answered by ropes and rollers; and the mural sculptures of Nineveh show us what can be done by such simple machinery. We there see the whole picture of how these colossal blocks of stone were moved from the quarry on to the place where they were wanted. Given plenty of time, and plenty of men and oxen, and there is no block that could not be brought to its right place by means of ropes and rollers. And that our forefathers did not stint themselves either in time, or in men, or other cattle, when engaged in erecting such monuments, we know even from comparatively modern times. Under Harold Harfagr, two kings spent three whole years in erecting one single tumulus; and Harold Blatand is said to have employed the whole of his army and a vast number of oxen in transporting a large stone which he wished to place on his mother’s tomb. As to the second question, we can readily understand how, after the supporters had once been fixed in the ground, an artificial mound might be raised, which, when the heavy slab had been rolled up on an inclined plane, might be removed again, and thus leave the heavy stone poised in its startling elevation.