Section I A-H. Letters to Sedgwick, 1821-1849, relating to English geology, museum accessions, etc. Section II A-Z, AA-II. Letters to Sedgwick, 1850-1872, relating to geology, the work of John William Salter, museum accessions, Lucas Barratt, etc. The correspondents include Harry Govier Seeley, Henry Keeping and Henry Wilkinson Cookson. JJ-OO. Letters to George William Featherstonhaugh and Osmond Fisher, 1827-c.1890s. The correspondents include Sir Richard Owen, Roderick Murchison and his wife, William Buckland, and Charles Lyell. Section III A-C. Letters from Sedgwick collected for his biography, 1820-c.1870s. The correspondents include G.W. Featherstonhaugh and H.G. Seeley. D-G. Transcripts of letters to and from Sedgwick, 1828-1872. The correspondents include R. Murchison, John Beete Jukes, William Willoughby Cole (3rd Earl of Enniskillen), and C. Lyell. H. Notebooks of Sedgwick and the Rev. Holmes of Freckenham, near Newmarket. I. Letters about the Sedgwick Memorial, 1873. Section IV A-D. Letters to Professor Robert Harkness, c.1851-1878. The correspondents include Sedgwick, R. Murchison and C. Lyell. Section V A-S. Papers of Thomas McKenny Hughes, 1818-1916. Material mainly connected with Hughes's work on theLife and letters of the Reverend Adam Sedwick, such as publications by Sedgwick, letters about Sedgwick, and Hughes's own notes, with correspondence and reviews of the finished biography. The correspondents include John George Goodchild, Thomas Davidson, Charles John Adrian Me&yumler, Valentine Searles Wood senior, and Valentine Searles Wood junior.