Let us pause a moment to consider what is involved in such a supposition. These tiles, which it is admitted are scattered in quantities over the surrounding plain, must have climbed to the top of the mound, penetrated through three undisturbed strata of earth, and finally penetrated "accidentally" between the close-fitting slabs forming the roof of the chamber. The hypothesis will not bear a moment's examination, but anything, however absurd, is to some minds preferable to admitting that any dolmen or tumulus can be subsequent to Roman times. It is astonishing, however, what effect that shibboleth, "no trace of metal," has on the mind of most antiquaries. It is, of course, true that before the metals were introduced no trace of them could be found in the prehistoric barrows of the rude savages that occupied Europe in the earliest times. We do not, at the present day, bury metal objects in our graves, and but for the coffin nails it would be as fair to argue that the graves in Kensal Green are prehistoric because the interments show no trace of metal implements. At all events, there are many burying races now existing who do not use coffins, nor bury metal objects in their graves; and all these this argument would make prehistoric. To me it seems much more logical to assume that, in those countries which had been occupied by the Romans, the natives, though reverting after their departure to their original modes of sepulture, had at least been so far civilized as to know that bronze daggers and spear-heads were not likely to be of much use in the next world, and had come to the conclusion that the personal ornaments of the dead might as well remain with their living friends. This hypothesis would at least account for the absence of metal in the long barrows of Gloucestershire, and at West Kennet, as well as at Crubelz, though Roman pottery was found in all these instances. In fact, it is the merest negative presumption to assume that, because no metal is found in a grave, it must be prehistoric. It may be of any age, down to yesterday's, in so far as such proof is concerned. Even the presence of metal, however, does not disturb the faith of some antiquaries. The Baron de Bonstetten, for instance, opened a tumulus not far from Crubelz. At one foot (30 centimetres) below the undisturbed surface the usual deposit of flint implements was found; and two feet (60 centimetres) below them two statuettes of Latona in terra-cotta and a coin of Constantine II. were found, but without this in the least degree shaking his undoubting faith in the prehistoric antiquity of the tomb![401]