The sepulchres of the Scottish kings were also explored, which were used for the last time as a royal cemetery when Macbeth was interred there beside his Queen Gruoch, the daughter of Bodhe,--as a record in the St. Andrew's Chartulary informs us was the unromantic name of Lady Macbeth.[207] Mr. Donald Gregory was secretary of the Iona Club, and one of the ablest Celtic scholars of his day. The designation which he affixed to the crania brought from Iona may be accepted as undoubted evidence of their having been found under circumstances which afforded proof of their high antiquity; though it is not necessary to assume from this that they had pertained to Druids. Most probably nothing more was intended by the epithet which Mr. Gregory applied to them, than to indicate, in the briefest manner, that he believed them to have belonged to the native population prior to the introduction of Christianity in the sixth century, when Columba landed at _Innis nan Druidheanach_, or the Isle of the Druids, as Iona is still occasionally styled by the native Highlander. The crania thus brought from the venerable centre of Celtic civilisation may not unreasonably be looked upon as furnishing characteristic types of the oldest historical race of the north of Europe.--No. 25 is also a good Celtic cranium, though less true to the type than No. 20, from its excess in longitudinal diameter. It was dug up at Knockstanger, Caithness, at a spot where a number of the Clan Mackay were interred, after being defeated in a battle fought with the Sinclairs in 1437. To these have been added No. 26, a skull in the Phrenological Museum, brought from an ancient cemetery at Inchmore, or Columb Kill, county of Longford, Ireland; and No. 27, a cast of a skull in the Phrenological Museum, marked as the Celtic type, and described as one of a series of skulls "selected from a number of the same tribe or nation, so as to present, as nearly as possible, a type of the whole in the Society's collection."[208] It is characterized in the printed catalogue as a "Long Celtic Skull," but would not, I think, be accepted by ethnologists as at all typical of the true Celtic cranium. It falls decidedly under the class designated by Professor Retzius as Dolicho-kephalæ, and is introduced in the table of measurements chiefly as furnishing useful elements of comparison. Contrasted with No. 20, it will be seen that it is 7.11 to 7.5, exceeding the latter in longitudinal diameter by 6/12, or half an inch, while in parietal diameter it falls short of it by 3/24. The difference is equally in favour of the true Celtic cranium, No. 20, in other measurements of breadth, including the frontal diameter and the inter-mastoid arch. This mode of comparison is still more remarkable and characteristic when the same skull, No. 27, is placed alongside of No. 10, a good example of the Brachy-kephalic class, the excess in the one set of measurements being fully balanced by a corresponding diminution in the others.