Yet the most important deposit of flint implements resembling certain types of the European drift, is that discovered by Messrs. Squier and Davis during their researches in Ohio. They have described this interesting find in the "Ancient Monuments of the Mississippi Valley," and a _resume_ of their account was given by me in the Smithsonian report for 1868, (p. 404.) The implements in question, I stated, occurred in one of the so-called sacrificial mounds of Clark's Work, on North Fork of Paint Creek, Ross County, Ohio. This flat, but very broad mound contained, instead of the hearth usually found in this class of earth-structures, an enormous number of flint discs, standing on their edges and arranged in two layers, one above the other, at the bottom of the mound. The whole extent of these layers has not been ascertained, but an excavation six feet long and four broad disclosed upward of six hundred of those discs, rudely blocked out of a superior kind of dark flint. I had occasion to examine the specimens from this mound, which were formerly in the collection of Dr. Davis, and have now in my collection a number that belonged to the same deposit. They are either roundish, oval, or heart-shaped, and of various sizes, but on an average six inches long, four inches wide, and from three-quarters to an inch in thickness. These flint discs are believed to have been buried as a religious offering, and the peculiar structure of the mound which inclosed them rather favors this opinion, while their enormous number, on the other hand, affords some probability to the view that they constituted a depot or magazine. Many of them are clumsy, and roughly chipped around their edges; and hence it has been suggested that they are no finished implements, but merely rudimentary forms, destined to receive more symmetry of outline by subsequent labor. Many of the discs under notice bear a striking resemblance to the flint "hatchets" discovered by Boucher de Perthes and Dr. Rigollot in the diluvial gravels of the valley of the Somme, in Northern France. The similarity in form, however, is the only analogy that can be claimed for the rude flint articles of both continents, considering that they occurred under totally different circumstances. The drift implements of Europe represent the most primitive attempts of man in the art of working stone, while the Ohio discs, if finished at all, are certainly very rough samples of the handicraft of a race that constructed earthworks of astonishing regularity and magnitude, and was already highly skilled in the art of chipping flint into various shapes.