The Mystery of the Clyde. "Popular" this puzzle cannot be, for there is no "demmed demp disagreeable body" in the Mystery. No such object was found in Clyde, near Dumbarton, but a set of odd and inexpensive looking, yet profoundly enigmatic scraps of stone, bone, slate, horn and so forth, were discovered and now repose in a glass case at the National Museum in Queen Street, Edinburgh.