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Rh engraving have been carefully sharpened, while that of the base has been removed by grinding. In the same field was found a flint lance-head or dagger of fine workmanship, which will subsequently be mentioned.

Messrs. Mortimer, of Driffield, possess an instrument of the same character found near Fimber. It is more equilaterally triangular in form than the Kempston specimen, though the sides are all curved and the angles rounded. It is polished all over on one face, though some traces of the original flaking are still apparent. On the other face, which is rather more convex, the grinding is confined to two sides of the triangle, which are thus brought to a sharp edge. The edge on the third side, which is rather straighter than the others, is very slightly rounded. It seems probable that this blunter edge was next the hand when the instrument was in use.

Another specimen, even more triangular in outline, was found in the Thames, at Windsor; it is of ochreous flint, and the base, which is 3 inches long, exhibits the natural crust of the flint; each of the other two sides, which are ground to a sharp edge, is about 2 inches long. Another from Lakenheath, 3 inches long and 3 inches wide at the unground base, was in the collection of the late Rev. W. Weller Poley, of Brandon.

I have an implement of this kind, much like that from Kempston, but more curved at what is the base in the figure. All along this sweep the edge produced by chipping out the form has been removed by grinding. All round the other sweep the edge has been carefully sharpened by the same means. A portion only of each face is ground. This specimen was found near Mildenhall. I have another, more curved both at the edge and the base, found near Icklingham. From the same district I have the form entirely unground. Other specimens found in Derbyshire are preserved in the Bateman Collection. There are several in the Museum at Oxford.

Fig.—256.—Eastbourne.

In Fig. 256 is shown an almost circular knife of this kind found at Willington Mill, near Eastbourne, which was kindly given to me by Mr. R. Hilton, of East Dean.

In the Greenwell Collection is another nearly circular tool, about 2 inches in diameter, ground to an edge along most of the periphery, and found in Yorkshire. Another rather smaller disc, in the same collection,