That the Mound-Builders were a far more civilized race than the Indians is clearly revealed by the relics found in and about the mounds. They have left behind them thousands of flint arrow-heads, many of beautiful workmanship. They used spades, rimmers, borers, celts, axes, fleshers, scrapers, pestles, and other implements whose use cannot now be determined, made of various stones, such as porphyry, greenstone, and feldspar. They knew well the use of tobacco, for among their most artistic and elaborately carved remains are pipes, some of them representing animals and human heads. It seems to be certain that they had even attained the art of weaving cloth fabrics; for pieces of cloth, of a material akin to hemp, have been found in the mounds, with uniform and regularly spun threads, and every evidence that they were woven by some deft invention or mechanical device. It is certain that the Red Indian was ignorant of this valuable art. [Sidenote: Primeval Mining.] Among the highly wrought remains of the mounds are fanciful water-jugs, well carved and symmetrical in shape, some of which were evidently made to keep water cool. The human heads represented on these bear no resemblance to the Indian types. Drinking cups with carved rims and handles, sepulchral urns with curious ornaments, kettles and other pieces of skilful pottery, copper chisels, axes, knives, awls, spear and arrow heads, and even bracelets, come to light, here and there. There is no doubt that the Mound-Builders were miners. For, on the southern shores of Lake Superior, great excavations indicate an extensive and skilful mining of copper at a very remote period. It is singular, on the other hand, that no iron implement has ever been discovered in the mounds. The builders used iron-ore as a stone, but never learned the art of moulding it into weapons or utensils. Thus the fact that vast areas of what are now the United States were once occupied by an active, skilful, imaginative, and progressive race, seems fully established. Not less certain is it that in their physical type, in their government, in their arts, habits, and daily pursuits, they were separated by a wide gap from the Red Indians whom our ancestors found in possession of the continent. The Indian was roving, and hunted for subsistence. The Mound-Builders were sedentary, and undoubtedly cultivated maize as their chief article of food. [Sidenote: Origin of the Mound-Builders.]