It is of diorite, and at the first glance might be taken for a stone arrow-head. But it is worn perfectly smooth along its two edges, especially towards the point, evidently from continuous use in the perforation of some hard substance, such as might result in the hollowing out of the bowl of a stone pipe: though such an instrument would be called into use in many operations of the old flint-workers. Knives and razors of diverse forms, and some of them finished with great care, at times in very fantastic shapes, are also of frequent occurrence. Their unusual shapes are probably in part due to the chance fracture of the flint-flakes, specimens of which abound in the pits on Flint Ridge, frequently requiring little manipulation to convert them into cutting implements. Fig. 14 is a small knife of this class, selected from several in the collection of Dr. Hill. It is made of yellow chert, and has a keen cutting edge. But there is another class of flint-knives not unfamiliar to European archæologists, of which interesting examples occur. A good American specimen of the flint-core, such as has been found in Kent’s Cavern, and elsewhere on British sites, and is common among the neolithic relics of Denmark, is now in my possession. It was picked up in the Granville valley, Licking county, Ohio, not far from the famous Alligator Mound; and shows the facets from which long curved flakes have been struck off. The curved form which the flake naturally assumes is frequently retained in the finished implements, along with three facets, forming an acute triangular blade, coming to a sharp edge. [Illustration: FIG. 15.—Flint Razor, Kentucky.] The Mexican obsidian is characterised by the same fracture; and some of the early Spanish writers enlarge on the keenness of the edge of the obsidian razors, as scarcely inferior to those of steel, though they speedily lose their edge. A good example of the flint razor is shown in Fig. 15, from the collection of Mr. James Pierce of Mayville, Kentucky. It is one of the outer flakes of the core, coming to a good edge on the one side, and chipped to a broad back. Fitted with a wooden haft, it would form a convenient cutting implement for many purposes. It is shown here nearly 5-6ths of the original size. The natural cleavage of the flint, thus controlling the forms which the fractured nodules assume, has tended to beget certain classes of implements common to all the stone periods of which we have any trace, from the palæolithic era of the drift and cave-men to that of the flint-workers among savage tribes of our own day. Horse-shoe, pear-shaped, oval, discoidal, and other scrapers abound among the more familiar implements of the old American flint-workers, reproducing all the forms common to the early stone periods of Europe, and which have been minutely illustrated by Mr. Evans.[38] But there is another type of scraper, of a more finished character, [Illustration: FIG. 16-17.—Flint Scrapers, Ohio.]