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Rh such as are found in the Irish and French chambered tumuli, could have been executed by artificial light. Either the stones were sculptured before being put into their places—which, to say the least of it, is very unlikely; or they were sculptured while the light could still penetrate through the interstices of the stones forming the walls. In any case, however, the naked forms of these chambers must have been perfectly familiar with those who used them; and there is no difficulty in understanding why, as at Carrowmore or Callernish, they should have repeated the same forms which were certainly never intended to be covered up.

From the occurrence of a similar form at Northern Moytura (woodcut No. 59), used externally also, it may be argued that this may be of the same age. The Irish example, as explained above, is probably of the same age as the great chambered tumuli of Meath; but there seems to be a difference between the two, which would indicate a very different state of affairs.

At Moytura, the covering stones, though thrown down, still exist, and there is every appearance of direct imitation. At Callernish, the size, the wide spacing, the pointed form of the stones, and the whole structure exhibit so marked a difference from anything that could be intended to be covered up, that it certainly appears as if a long time had passed before the original use of the form could have been so completely overlooked as it has been in this instance. Everyone must determine for himself how many centuries he would interpose between New Grange and Callernish. To me it appears that an interval of very considerable duration must have elapsed between them.

At Tormore, on the west coast of the Isle of Arran, there is a third group of these monuments, more numerous, but not on so large a scale as those of Stennis or Callernish. These were all carefully examined by Dr. Bryce, of Glasgow, assisted by a party of archæologists, in 1864, and the results recorded in the 'Proceedings of the Scottish Antiquaries,' and also in a small work on the Geology of Arran. All were found to contain sepulchral remains, except one which had been rifled, but there the cist still remained. The principal circle is now represented by only three