Of particular interest are the rocking or logan stones, which evince the mechanical skill of these early peoples. These relics consist of enormous boulders poised upon one or two small points in such a manner that the slightest pressure will sway them, but the greatest effort is not sufficient to overthrow them. These were called living stones by the Greeks and Latins, the most famous one being the Gygorian stone in the Strait of Gibraltar. Though so perfectly balanced that it could be moved with the stalk of a daffodil, this rock could not be upset by the combined weight of many men. There is a legend that Hercules raised a rocking stone over the graves of the two sons of Boreas whom he had killed in combat. This stone was so delicately poised that it swayed back and forth with the wind, but no application of force could overturn it. A number of logan stones have been found in Britain, traces of one no longer standing having been discovered in Stonehenge. (See The Celtic Druids.) It is interesting to note that the green stones forming the inner ring of Stonehenge are believed to have been brought from Africa.

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Now the compilers of narratives say that in the island of Britain s there is a cave situated under a mountain, and a chasm on its summit; and that,...