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348 stood from the preceding woodcut, taken from 'La France Monumentale et pittoresque,' which correctly represents its form and appearance. The cap-stone measures 22 feet by 11 feet, and is 16 inches in thickness, and is so balanced on its two points of support that a slight pressure of the hand is sufficient to set it oscillating with a motion which it retains for some time.

Another and more celebrated one, in Brittany, which is known as the Pierre branlante de Huelgoat, seems rather due to accident. It looks as if it formed, or was intended to form, part of a demi-dolmen, but happening to rest on one of its supports so as to oscillate, it has been allowed to remain so. Even assuming, however, that this was done designedly, what would it prove beyond the desire which pervades all these monuments, of exciting astonishment by tours de force. I believe it is correct to say that no passage exists in any book ancient or medieval which mentions rocking stones or their uses; nor has anyone