One hundred and seven holograph letters written largely by An[dre]w C. Ramsay to [Mary Louisa] Ramsay, 1853-1881 (the activities of the Geological Survey of the United Kingdom and the Geological Survey of Ireland, personal and family affairs, observations on Gloucester Cathedral, the writer's report to Warwick Board of Health, a long chat with Charles Darwin, comments on Lady Llanover's attitude to the harp, comments on the international situation (1870), an account of a visit to Hartlepools, impressions of Lorna Doone (1872), the writer's report on Gibraltar, the recipient's European holiday (1880), etc.). A few of the letters are written from Llangollen, Llanfairynghornwy, Holyhead, and Dolaucothy. Among the few letters not in the hand of Andrew C. Ramsay are three written to him by his wife from the Congregational Manse, Oban, 1872.