I was struck, when examining the rude stone mauls of the miners of Ontonagon, by their resemblance to some which I have seen, obtained from ancient copper workings of North Wales. In a communication made to the British Archæological Institute by the Hon. William Owen Stanley, in 1850, he gave an account of an ancient shaft broken into at the copper mines of Llandudno, Carnarvonshire. In this were found mining implements, consisting of chisels, or picks of bronze, and a number of rudely-fashioned stone mauls of various sizes, weighing from about 2 lbs. to 40 lbs. Their appearance suggested that they had been used for breaking, pounding, or detaching the ore from the rock; and the character both of the bronze and stone implements seems to point to a period long prior to the Roman occupation of Britain. These primitive mauls are stated to be similar to water-worn stones found on the sea-beach at Pen Mawr. Mr. Stanley also describes others, corresponding in like manner to those found on the shores of Lake Superior, which had been met with in ancient workings in Anglesea. Were we, therefore, disposed to generalise from such analogies, as ingenious speculators on the lost history of the New World have been prone to do, we might trace in this correspondence a confirmation of the supposed colonisation of America, in the twelfth century, by Madoc, the son of Owen Gwynnedd, king of North Wales. But the resemblance between the primitive Welsh and American mining tools, can be regarded only as evidence of the corresponding operations of the human mind, when placed under similar circumstances, and with the same limited means, which is illustrated in so many ways by the arts of the stone-period, whether of the most ancient or of modern date. Nor can such correspondences be regarded as altogether accidental. They confirm the idea of certain innate and instinctive operations of human ingenuity, ever present and ready to be called forth for the accomplishment of similar purposes by the same limited means.