The materials of the present work are principally derived from original sources with respect to Manuscripts; and from the highest published authorities. All printed materials are scrupulously acknowledged in two catalogues, one historical and literary, the other wholly scientific. Through the kindness and liberality of His Grace the Duke of Beaufort, the entire collection of Manuscripts in his Grace’s possession, relative to the Marquis of Worcester, are here given at large. While at Raglan, on visiting Troy, Osmond A. Wyatt, Esq., was especially obliging in affording information; as well as John Cuxson, Esq., of Raglan; and at Badminton, John Thompson, Esq., materially assisted in procuring the required manuscripts, and affording facilities for copying them, for which kindly aid the author can but insufficiently here express his obligations. The author is likewise greatly indebted generally to the rich stores of the British Museum, and the obliging attentions of its principal officers; to the State Paper Office, where he was especially assisted through the kindness of Mrs. M. A. E. Green, with the uncalendered papers given at pages 249, 270, 286, and 287, and to John Bruce, Esq. Also to the excellent Libraries of the Royal Society; the London Institution; and the particularly valuable scientific collection of the Patent Office. At Oxford, the privilege of consulting works and manuscripts at the Bodleian Library, was freely granted, and every facility afforded. The author would especially notice among other contributions of information, the able assistance of Bennet Woodcroft, Esq., F.R.S., &c. To the Rev. John Webb, of Hay, he is particularly indebted for the papers at pages 64, 88, and 142, to which that gentleman directed his attention, and which he might otherwise have overlooked. He has also received assistance from the collections of Robert Cole, Esq., and of the late Dawson Turner, Esq., which are noted where they occur. When inquiring for the autograph of “Glamorgan,” every possible effort to trace it, although unavailing, was kindly employed by the Librarian of St. Cuthbert’s College, Durham, and by the Rev. Dr. Grant, the Roman Catholic Bishop of Southwark. During the author’s visit to Dublin, Sir Bernard Burke, Ulster King at Arms, very obligingly searched for any documents referring to the Earl of Glamorgan, that might be in Dublin Castle, but without success; and the author is also much indebted for general information most courteously given by the Rev. Dr. Todd, of Trinity College, Dr. R. G. Travers, Marsh’s Library, and the Rev. C. P. Meehan; and likewise, through correspondence, by the Rev. James Graves, of Stonyford.