The fort on Knockfarril, which overlooks the valley of Strathpeffer, in Ross-shire, encloses an oval area of about 120 paces in length by about 40 in breadth. It was first described by Mr. John Williams in 1777.[101] Sections were then made through it from side to side, and Mr. Williams states that on the north side he found the ruins of the wall 12 feet high, although he came to the conclusion that this was a section of the width of the wall which had fallen flat outwards. With regard to the phenomena of vitrifaction, he states that the whole wall has been run together into one solid mass, but in another place he states that at the outskirts of the ruins and at the bottom of the hill there was a great quantity of large stones which had not been touched by fire, and from this he concluded that there had been some kind of stone buildings going round on the outside of the vitrified walls. It is to be observed that when he speaks of the whole wall being run together into one solid mass, he is not stating a fact, which he has observed, but a conclusion which he has formed from a partial examination. “I am of opinion,” he says, “and it appears by the ruins that the whole of the surrounding wall on Knockfarril has been run together by vitrifaction much better than the most of the kind I have seen.” He states also that immediately on the inside of the surrounding walls there were ruins of buildings in which the vitrifaction was much less complete, and these he imagined to have been a range of habitations reared under the shelter of the outer wall. ----- Footnote 101: _Account of some remarkable Ancient Ruins recently discovered in the Highlands. In a series of Letters by John Williams, mineral engineer._ Edinburgh, 1777. ----- Craig Phadrig, near Inverness, when examined by Williams, presented the peculiarity of two vitrified walls, the remains of which could be traced quite round the inclosed area, while the remains of a third were visible at the entrance at the east end. The outer wall was founded on the rock, about 6 or 8 paces distant from the inner wall. Its greatest height did not then exceed 4 or 5 feet, but he found large masses of it adhering to the rock where it was first run. The area enclosed was from 80 to 90 paces long by about 30 broad. The fort at Finhaven, near Aberlemno, in Forfarshire, is an irregular oblong with rounded corners, about 150 paces in length by about 36 in breadth. The walls are greatly dilapidated, and but a small part of their height is now visible. They appear to have been about 10 feet in thickness, and in some places there is still 4 or 5 feet of the height remaining. The vitrifaction is very unequal, and many parts of the wall scarcely show the action of fire, while in others the melted matter has run down among the interstices of the stones.