is manifest, often travelled great distances for the material best suited to their manufactures; and the use of flint or hornstone for slingstones, lance and arrow heads, as well as for knives, scrapers, axes, and other domestic and agricultural tools, must have involved a constant demand for fresh supplies. It might be assumed, therefore, apart from all direct evidence, that a regular system of quarrying for the raw material both of the pipe and the implement-maker was pursued; and that by trade or barter the pipestone of divers qualities, and the chert or hornstone, the quartzite, jasper, and other useful minerals, were thus furnished to tribes whose homesteads and hunting-grounds yielded no such needful supplies. But the same region which abounds in such remarkable evidences of the ingenious arts of a vanished race, also furnishes traces of the old miners, by whose industry the flint was quarried and roughly chipped into available forms for transport to distant localities, or for barter among the Mound-Builders in the region traversed by the great river. At various points on Flint Ridge, Ohio, and localities far beyond the limits of that state, as at Leavenworth, 300 miles south of Cincinnati, where the gray flint abounds, evidences of systematic quarrying illustrate the character and extent of this primitive commerce. Funnel-shaped pits occur, in many cases filled up with the accumulated vegetable mould of centuries, or only traceable by a slight depression in the surface of the ground. When cleared out, they extend to a depth of from four or five, to nearly twenty feet. On removing the mould, the sloping sides of the pit are found to be covered with pieces of fractured flint, intermingled with unfinished or broken implements, and with others partially reduced to shape. The largest hoes and spades hitherto noted appear to have been fashioned of quartzite, but those of most common occurrence in Ohio and Kentucky are made of the gray flint or chert, which abounds in the Flint Ridge pits in blocks amply sufficing for the manufacture of tools upwards of a foot in length, such as may be assumed to have been employed in the construction of the great earthworks. But the transportation of the unwrought blocks of hornstone to the work-yards in the valley would have involved great labour in the construction of roads, as well as of sledges or waggons suited to such traffic. In lieu of this, the accumulated waste chips in the quarries show the amount of labour that was expended there in order to facilitate the transport of the useful material. Suitable flakes and chips were no doubt also carried off to be turned to account for scrapers, knives, and other small implements. Partially shaped disks and other pieces of all sizes abound in the pits, but the finer manipulation, by means of which small arrow heads, lances, drills, scrapers, etc., were fashioned, was reserved for leisure hours at home,