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,'[300] and also in a small work on the Geology of Arran.[301] 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 upright stones, from 18 to 20 feet in height; but they originally formed parts of a circle 60 feet in diameter. Two other circles can be traced, and two kistvaens of considerable dimensions, and two obelisks on the high ground, which apparently formed parts either of circles or of some other groups of stones.