On the conclusion of my second series of Lectures on Scotland in Early Christian Times, the Council of the Society of Antiquaries of Scotland having done me the honour of again appointing me to the Rhind Lectureship for a term of two years, that I might deal with the antiquities of the Pagan Period in Scotland, I have devoted the present series of Lectures to the investigation of the remains of the Iron Age, leaving those of the Bronze and Stone Ages to be dealt with in the succeeding series.

I have to thank the Council for their permission to use such of the Society’s woodcuts as might be suitable for the illustration of the Lectures, and my thanks are also due to Mr. J. Romilly Allen for the use of some of his drawings and measurements of Brochs, to Messrs. Chambers for the view of the Broch of Mousa, and to Mr. Thomas S. Muir for the use of his etching of the Broch of Clickamin, which forms the frontispiece to the present volume.