The contents are as follows.
(i) Correspondence and papers of George Rennie, engineer, 1821-1863 (folio 1);
(ii) Papers relating to the sale in 1850 of John Rennie's library by his sons, including annotated sale catalogues etc. (folio 186);
(iii) Copy, 1893, of George Rennie's marriage certificate, 1828 (folio 240);
(iv) Letters to James Watt junior, passed on to George Rennie, on the subject of John Rennie's life and work, 1821 (folio 241).