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Rh that the great mounds should be thoroughly explored, and this, from the nature of their material, will practically involve their destruction, which would be very much to be regretted. Mean- while, if I may be allowed to offer a conjecture, I would say that New Grange might be the "Cumot or Commensurate grave of Cairbre Lifeachair." He, according to the Four Masters, reigned from 271 to 288—but probably fifty or sixty years later—and seems to have been a king deserving of a right royal sepulchre; and I feel great confidence that the unopened tumulus near the river may be what tradition says it is—the grave of the Great Dagdha, the hero of Moytura. With regard to the others, it would not be safe to hazard any opinion in the present state of our knowledge. For the present it is sufficient to feel sure that we have a group of monuments all, or very nearly all of which were erected in the first four centuries of the Christian era, and from this basis we may reason with tolerable certainty regarding the other groups which we may meet with in the course of this enquiry.

At a distance of twenty-five miles nearly due west from Brugh na Boinn, and two miles south-east from Oldcastle, is a range of hills, called on the Ordnance map Slieve na Calliagh—the hags' or witches' hill. It is upwards of 200 feet above the level of the sea, and the most conspicuous elevation in that part of the country. On the ridge of this range, which is about two miles in extent, are situated from twenty-five to thirty cairns, some of considerable size, being 120 to 180 feet in diameter; others are much smaller, and some so nearly obliterated that their dimensions can hardly be now ascertained. Till seven or eight years ago this cemetery was entirely unknown to Irish antiquaries, and the positions of the cairns were hardly even indicated in the Ordnance Survey; but in 1863 they attracted the attention of Mr. Eugene Conwell, of Trim. In the years 1867-8 he was enabled, with the assistance and co-operation of the late Mr. Naper, of Lough Crew, the proprietor of the soil, to excavate and explore the whole of them. A brief account of the results which he obtained was submitted to the Royal Irish Academy in 1868, and afterwards printed by him for private