Not the least curious among the primitive relics in the celebrated museum of northern antiquities at Copenhagen, are the various whetstones, some of which have been found in barrows and elsewhere under ground, with half-finished stone-wedges lying upon them, as if the workman had been suddenly interrupted by death in the midst of his laborious industry, and his unaccomplished task had been deemed the fittest memorial to lay beside him. It formed no part of the old Pagan creed that "there is no work nor device in the grave." Possibly enough the buried celt-maker was expected to resume his occupation and finish his axe-grinding in the spirits' land. No similar example has yet been noted in Scotland, though smaller hand whetstones, like the one found at North Berwick, are not uncommon. One which is described as very smooth and neat, was obtained among the contents discovered on excavating within the area of the vitrified fort of Craig Phaidrick, near Inverness;[168] several such were found in cists at Cockenzie, East-Lothian; and Barry mentions among the miscellaneous contents of the tumuli or cists in the island of Westray, "a flat piece of marble, of a circular form, about two inches and a-half in diameter, and several stones, in shape and appearance like whetstones that had never been used."[169] Great as are the numbers and varieties of the stone weapons and implements of Denmark, compared with those found in Britain, they appear to be surpassed in both respects by the corresponding relics of the Mexican Stone Period. Such facts suggest the inference, which history in some degree confirms, that the metallurgic arts were earlier known in Britain than in Denmark, thereby superseding the arts of the stone-workers before they had been elaborated as elsewhere; while in Mexico, Yucatan, and throughout the districts of the North American continent, where a native civilisation is known to have prevailed, iron was totally unknown, and copper had not completely superseded the stone hatchet and arrow-point when Columbus opened a way to that new world. But who shall say how many more curious and noteworthy reminiscences of the past may have been ignorantly destroyed in Scotland, among the thousands of burial-mounds annually invaded by the unlettered peasant in his agricultural labours.