XVII. Observations on Vitrified Fortifications in Galloway. By Robert Riddell, Esq. F.A.S. In a Letter to Mr. Gough.

The ingenious Mr. Williams mineral engineer having discovered in the Highlands of Scotland fome singular remains which he called vitrified forts, and having described in a Series of Letters those, at the hill of Knockfarrel, at the hill of Craig Phadrick, at the hill of Dun-Evan, at Castle Finlay and at the Castle hill of Fin-avon, this publication very much engaged the attention of the curious in research. Along with it, was published a Description of Craig-Phadrick, by Mr. Wate, Engineer at Birmingham, arid a Letter from Dr. Black, Professor of Chymistry, to Mr. Williams.