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238                 NATURAL HISTORY OF GEMS.
our nobles pride themselves ; because this stone has veins more translucent than any other of the same kind, and moreover is harder than rock-crystal. They also paint the back of these coats-of-arms with the proper tinctures required by the armorial bearings."
The Onyx, strange to say, considering its high repute in ancient times, bore a most unfavourable character in the Middle Ages, Marbodus asserting that its wearer was ex­posed to the assaults of demons and of ugly visions by night, besides being pestered with quarrels and lawsuits by day. The sole remedy was to wear -a Sard at the same time, which would completely neutralise the mischievous influence of the Onyx.