Returning to England after the visit of 1896, I gave two lectures on Diamonds at the Imperial Institute and one at the Royal Institution. These lectures, and the lecture delivered at Kimberley, in 1905--hitherto only privately distributed--form the basis of the present volume. On each visit I took abundant photographs, many of which I now reproduce. A few are copied from plans lent by Mr. Gardner Williams and one or two are from photographs purchased at Kimberley. In obtaining statistical information of the Diamond industry, I owe much to the Annual Reports of the De Beers Company. I have also quoted freely from Reunart’s valuable book on _Diamonds and Gold in South Africa_; and I render my acknowledgments to the authors of the following papers and memoirs. _On a Visit to the Diamond Fields of South Africa, with Notices of Geological Phenomena by the Wayside._ By John Paterson, Esq., M.A. _On the Mode of Occurrence of Diamonds in South Africa._ By E. J. Dunn. _On the Origin and Present Position of the Diamonds of South Africa._ By G. G. Cooper, Esq., of Graaf Reinet. _On the Character of the Diamantiferous Rock of South Africa._ By Prof. N. Storey Maskelyne, F.R.S., Keeper, and Dr. W. Flight, Assistant in the Mineral Department, British Museum. _Further Notes on the Diamond Fields of South Africa._ By E. J. Dunn. _Notes on the Diamond Fields of South Africa, 1880._ By E. J. Dunn. _Analogies between the Diamond Deposits in South Africa and those in Meteorites._ By M. Daubrée. _Notes on the Diamond-bearing Rock of Kimberley, South Africa._ By Sir J. B. Stone, Prof. T. G. Bonney, and Miss Raisin. _Notes on the Diamond Rock of South Africa._ By W. H. Hudleston. _The Parent Rock of the Diamond in South Africa._ By the Reverend Professor T. G. Bonney. The Presidential Address, by Grove Carl Gilbert, to the Geological Society of Washington, on _The Origin of Hypotheses. Illustrated by the Discussion of a Topographical Problem._ 1896. _Le Four Electrique._ By Henri Moissan. 1897. _The Diamond Mines of South Africa._ By Mr. Gardner F. Williams. (In this publication the story of the rise and development of the industry is exhaustively narrated.) _British Association, South African Meeting, 1896, Kimberley Handbook._ _The Meteor Crater of Canyon Diablo, Arizona; its History, Origin, and Associated Meteoric Irons._ By George P. Merrill. 1908.