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Published online by Cambridge University Press: 17 January 2013
In the month of September last (1822), when becalmed in my cutter in the Kyles of Bute, I accidently landed on the most northerly of the Burnt Isles, a small group that stretches across the Kyle or narrow channel between Bute and Argyleshire.
From the appearance of a ridge nearly covered with turf, I imagined at first that kelp had been formerly burnt here, but on examining it more narrowly I discovered that it was caused by the remains of a vitrified fort.
page 80 note * Since this paper was written, the theory of their volcanic origin has been revived by Dr Hibbert, in consequence of an examination of the Fort of Finhaven, in the county of Forfar. I have not seen that fort, but I cannot imagine that it will apply to the one in question, which is of a regular form, and placed on the flat surface of a primitive rock. Neither can it be accounted for by supposing that volcanic productions have been brought from a distance for the purpose of building, because both from the size of the vitrified masses, and from the downward direction in which the fused matter has run, we must conclude that the vitrification has taken place after the walls were built.