Probably at least one hundred uncovered dolmens in these islands could be enumerated, which have not now a trace of any such envelope. Some are situated on uncultivated heaths, some on headlands, and most of them in waste places. Yet it is contended that improving farmers at some remote age not only levelled the mounds, but actually carted the whole away and spread it so evenly over the surface that it is impossible now to detect its previous existence. If this had taken place in this century when land has become so valuable and labour so skilled we might not wonder, but no trace of any such operation occurs in any living memory. Take for instance Kits Cotty House, it is exactly now where it was when Stukeley drew it in 1715,[61] and there was no tradition then of any mound ever having covered it. Yet it is contended that at some earlier age when the site was probably only a sheep-walk, some one carried away the mound for some unknown purpose, and spread it out so evenly that we cannot now find a trace of it. Or take another instance, that at Clatford Bottom,[62] also drawn by Stukeley. It stands as a chalky flat to which cultivation is only now extending, and which certainly was a sheep-walk in Stukeley's time, and why, therefore, any one should have taken the trouble or been at the expense of denuding it is very difficult to understand, and so it is with nine-tenths of the rest of them. In the earlier days when a feeling for the seclusion of the tomb was strong, burying them in the recesses of a tumulus may have been the universal practice, but when men learned to move such masses as they afterwards did, and to poise them so delicately in the air, they may well have preferred the exhibition of their art to concealing it in a heap which had no beauty of form and exhibited no skill. Can any one for instance conceive that such a dolmen as that at Castle Wellan in Ireland ever formed a chamber in barrow, or that any Irish farmer would ever have made such a level sweep of its envelope if it ever had one? So in fact it is with almost all we know. When a dolmen was intended to be buried in a tumulus the stones supporting the roof were placed as closely to one another as possible, so as to form walls and prevent the earth penetrating between them and filling the chambers, which was easily accomplished by filling in the interstices with small stones as was very generally done. These tripod dolmens, however, like that at Castle Wellan, just quoted, never had, or could have had walls. The cap-stone is there poised on three points, and is a studied exhibition of a _tour de force_. No traces of walls exist, and if earth had been heaped upon it the intervals would have been the first part filled, and the roof an absurdity, as no chamber could have existed. These tripod dolmens are very numerous, and well worth distinguishing, as it is probable that they will turn out to be more modern than the walled variety of the same class. But with our