Autograph letters and copies of letters from Edward Lhuyd to the Reverend John Lloyd, Ruthin, David Lloyd, Blaenyddol, Richard Mostyn, Penbedw, and others, 1685-1708; a list of plants observed on Aran Benllyn and Snowdon, 1682; a short Irish-Latin-Welsh vocabulary, and a copy of Lhuyd's 'parochial queries'; miscellaneous letters, including autographs of Susannah Puleston, 1678, John Myddelton, 1713, Will: Gruffith of Llyne, 1660 (with Welsh sermon notes), B. Bulkeley, H. Egerton, M. Price, Margarett Coytmore, Thomas Pennant, John Anstis, etc.; the opinion of Sir Thomas Powys on the will of Owen Jones of Braichybib, 1687; and papers relating to the fishery of Dysynni, with an opinion by Sir William Williams, 'Speaker Williams'.