The contents are as follows. (i) Letters of George Rennie, engineer, 1808-1809, 1814, 1821. (Folio 1.) (ii) Letters of Sir John Rennie, 1810-1812, 1814-1815, 1818-1821. These include the detailed letters he sent while on his extensive tour in France, Italy, Greece, Turkey, and Egypt. They contain plans and diagrams as well as detailed descriptions of many engineering undertakings, especially bridges and harbours. (Folio 25.) (iii) Letters of George Rennie of Phantassie, 1792, 1806, 1820-1821. (Folio 111.) (iv) Letters of George Rennie, Governor of the Falkland Islands, 1817. (Folio 124.) (v) Letters of George Rennie, Captain, Royal Navy, 1809-1810, 1812. (Folio 130.) (vi) Letters to James Rennie, army surgeon, uncle of John Rennie, 1779-1880. (Folio 149.) (vii) Letter of John Rennie, a cousin of the engineer, 1820. (Folio 133.) (viii) Letters of General Sir John Aitchison, nephew of John Rennie, 1809-1810, 1812-1814. Aitchison fought through the Peninsular War, and these letters give an account of the campaign through the eyes of a perceptive and intelligent subaltern. For further letters on this subject from Aitchison see Thomson, ‘An ensign in the Peninsular War’, 1981. (Folio 135.) (ix) Letters of other members of the Aitchison family, 1806, 1812, 1814, 1819-1821. (Folio 225.)