The third of these great tumuli on the Boyne is known as that of Dowth. Dubhad if Petrie is right in identifying it with the third sepulchre plundered by the Danes in 862. It was dug into by a Committee of the Royal Irish Academy in 1847, but without any satisfactory results. A great gash was made in its side to its centre, which has fearfully disfigured its form,[249] but without any central chamber being reached; but on the western side a small entrance was discovered leading to a passage which extended 40 feet 6 inches (from A to D) towards the interior. At the distance of 28 feet from the entrance it formed a small domical chamber, with three branches, very like that at New Grange, but on a smaller scale. In the centre of this apartment was one large flat basin (L), similar in form, and, no doubt, in purpose, to the three at New Grange, but far larger, being 5 feet by 3 feet. The southern branch of the chamber extends to K in a curvilinear form for about 28 feet, where it is stopped for the present by a large stone, and another partially obstructs the passage at 8 feet in front of the terminal stone. The Academy have not yet published any account of their diggings, nor does any plan of the mound exist, so far as I know, anywhere. Even its dimensions are unknown. Pending these being ascertained, it does look as if this chamber was in an envelope similar to that just suggested as having existed at New Grange. In that case the original tumulus was probably 120 feet in diameter, and with its envelope 200 feet. The walls of the chambers of this tomb are even more richly and elaborately ornamented than those of the chambers at New Grange, and are in a more delicate style of workmanship. Altogether I should be inclined to consider it as more modern than its more imposing rival. One other small tumulus of the cemetery is open. It is situated in the grounds of Netterville House. It is, however, only a miniature repetition of the central chambers of its larger compeers, but without sculptures or any other marked peculiarity. The mound called the Tomb of the Dagdha and the ten or twelve others which still exist in this cemetery, are all, so far as is known, untouched, and still remain to reward the industry of the first explorer. If the three large mounds are those plundered by the Danes, which seems probable, this is sufficient to account for the absence of the usual sepulchral treasures, but it by no means follows that the others would be equally barren of results. On the contrary, there being no tradition of their having been opened, and no trace of wounds in their sides, we are led to expect that they may be intact, and that the bones and armour of the great Dagdha may still be found in his honoured grave.