Another peculiarity of form is where the edge, instead of being as usual nearly in the centre of the blade, is almost in the same plane as one of the faces, like that of a joiner’s chisel. An implement of this character, from a “Pict’s castle,” Clickemin, near Lerwick, Shetland, is shown in Fig. 85. It was presented to me by the late Rev. Dr. Knowles, F.S.A. The material appears to be a hard clay-slate. The form is well adapted for being mounted as an adze, much in the same manner as the nearly similar implements in use by the South Sea Islanders. A New Zealand[442] adze of precisely the same character has been figured. Sometimes the edge of a celt, instead of being sharp, has been carefully removed by grinding, so as to present a flat or rounded surface. |139| In Fig. 86 is represented a singular implement of this kind in flint. It is polished all over; one side is straight, and the other curved; both ends are curved, but one is rounded at the edge and the other flat. It is difficult to understand for what purpose such an instrument can have been intended. There is no reason for supposing that the grinding at the ends was later in date than the formation of the other parts. I have others like Fig. 30 with the edge also flattened, one of these I found, as already mentioned, at Abbot’s Langley; and I have seen another flint celt of much the same form, found at Chesterford, Cambs., with a somewhat flat edge, but rounded and worn away, as if by scraping some soft substance. Small transverse _striæ_, such as might have been caused by particles of sand, are visible on the worn edge. In the Greenwell Collection is a portion of a celt of greenstone, the fractured face ground flat and a portion of the edge also ground away. [Illustration: Fig. 85.—Near Lerwick. 1∕2] [Illustration: Fig. 86.—Weston, Norfolk. 1∕2] A small flint celt, with a round polished edge instead of a cutting one as usual, was found, with other objects, in a barrow on Elton Moor, Derbyshire.[443] I have seen a small flint celt like Fig. 33, with the edge perfectly rounded by grinding. It was found between Deal and Dover, near Kingsdown, by Mr. Hazzeldine Warren, of Waltham Cross. It is hard to say for what purpose the edge was thus made blunt. In some cases, however, the instruments may have been used as battle-axes, the edges of which when of the perforated forms are usually flattened or rounded, probably with the view of preventing accidental injury to those who carried them. In some celts, however, the broad end is so much rounded that they can hardly be said to have an edge, and they have more the appearance of having-been burnishing or |140| calendering tools. I have observed this rounding of the end in some Irish and French specimens, not made of flint, as well as in one from India.