is polished as if by rubbing, and looks as if it might have been used in the same manner as bookbinders' tools for indenting lines on leather. This instrument is 6 inches long, 3 inches wide at the butt-end, and 21/2 inches at the sharp end. It is nearly 11/4 inches thick.
Besides the three which I have mentioned several other instruments of the same description have been found in the same part of Yorkshire.
I have never seen any specimens of precisely this character from other localities; but they were apparently destined for much the same purposes as the "Picts' knives," shortly to be mentioned, unless possibly they were merely used in the manner just indicated. It is very remarkable that the form should appear to be limited to so small an area in England; and though the specimens occur under the same circumstances as polished celts, it seems probable that for stone antiquities they belong to a late period.
Fig. 261.—Crambe. 1/2
The large thin flat blades, usually subquadrangular or irregularly oval in form, of which a large number has been found in the Shetland Islands, and which are known as "Pech's knives," or "Picts' knives," apparently belong to the same class of instruments as the quadrangular and triangular tools lately described, and this would therefore appear to be the proper place for making mention of them. They are never formed of flint; the principal materials of which they are made being slate and compact greenstone, porphyry, and other felspathic rocks, and madreporite. Their usual length is from 6 inches to 9 inches, and the breadth from 3 inches to 5 inches; their thickness is rarely more than 1/2 inch in the middle, and sometimes not more than 1/10 of an inch. They are usually polished all over, and ground to an edge all round. Sometimes, however, the edge on one or more sides is rounded, and occasionally an end or side is left of the full thickness of the blade, and rounded as if for being held in the hand. I have a specimen, 41/2 inches long, and 31/4 inches wide at the base, formed of porphyritic greenstone, and found at Hillswick, in Shetland, which was given me by the late Mr. J. Gwyn Jeffreys, F.R.S. Its cutting edge may be described as forming nearly half of a pointed ellipse, of which the thick side for holding forms the conjugate diameter. This side is rounded and curved slightly inwards; one of the angles between this base and the elliptical edge is rounded, and a portion of the edge is also left thick and rounded, so that when the base is applied to the palm of the hand the lower part of the forefinger may rest upon it. When thus held it forms a cutting tool not unlike a leather-cutter's knife. Instruments of this character are extremely rare in England, but in the extensive Greenwell Collection is a specimen which I have engraved as Fig. 261. It was found at Crambe, in the North Riding of Yorkshire, and is formed of an oolitic shelly limestone, a material also used for the manufacture of celts in
