Celts[158] and hatchets, or wedges, are among the most abundant of all the relics of the Stone Period. They have been discovered in considerable quantities in almost every part of Scotland, from the remote Orkney and Shetland Isles,[159] to the shores of the Solway and the banks of the Tweed. They are frequently found rudely executed, with little appearance of labour except at the edge; while other examples are characterized by the highest finish and the utmost degree of polish that the modern lapidary could confer on them. The manner of attaching the stone celt to a handle has been made the subject of some discussion, though sufficiently illustrated by the practice of the modern Polynesians and other savage tribes still using weapons of stone. M. Boucher de Perthes has succeeded in throwing some new light on the subject by researches in the neighbourhood of Abbeville, which point to the conclusion that the French celt has been inserted into the hollow portion of a stag's horn having a perforation in it to receive the handle.[160] Various other methods, however, have been shewn by which this primitive weapon could be hafted, so as to become available for the war axe of the northern warrior. The example found in the earliest ancient canoe of the Clyde, leaves no room to doubt that it was bound to the handle by thongs or portions of the haft passing round the middle. Both ends are highly polished, while the middle remains rough, having evidently been designed to be covered and concealed.[161] One stone celt has been found in Ireland, near Cookstone, in the county of Tyrone, still attached to its wooden handle, the artless rudeness of which could hardly be surpassed.[162] Much more efficient means, however, are frequently seen employed in corresponding weapons brought from the South Sea Islands than any of the ancient examples display; and these may suffice to illustrate the improved methods which experience would suggest to the rude Caledonian aborigines. [Illustration: Hatchets.]