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this head I propose to treat of those implements which have apparently been used as hammers, but which, for that purpose, were probably held in the hand alone, and not provided with a shaft, as the groove or shaft-hole characteristic of the class last described, is absent. At the same time there are some hammer-stones in which there are cavities worked on either face, so deep and so identical in character with those which, in meeting each other, produce the bell-mouthed perforations commonly present in the hammers intended for hafting, that at first sight it seems difficult to say whether they are finished implements, or whether they would have become perforated hammer-heads had the process of manufacture been completed. Certainly in some cases the cavities appear to be needlessly deep and conical for the mere purpose of receiving the finger and thumb, so as to prevent the stone slipping out of the hand; and yet such apparently unfinished instruments occur in different countries, in sufficient numbers to raise a presumption that the form is intentional and complete. There are some instances where, as was thought to be the case with a quartz pebble from Firth, in Orkney, the unfinished implements may have been cast aside owing to the stone having cracked, or to the holes bored on each face not being quite opposite to each other, so as to form a proper shaft-hole.

In other instances, as in Figs. 160 and 161, the battering of the end proves that the stones have been in actual use as hammers. It is of course possible that these cavities may have been worked for the purpose of mounting the stones in some other manner than by fixing the haft in a socket. A split stick may, for instance, have been used, with a part of the wood on each side of the fissure worked away, so as to leave projections to fit the