The contents are as follows. (i)-(ix) Cornmills. (i) Albion Mill, street plans, circa 1795, circa 1814, showing the position of the mill, and the letter, 1786, in which John Rennie described to his brother George the first starting of the mill, with miscellaneous notes and calculations relating to the mill, and to corn-milling in London, 1796-1798 (folio 1); (ii) Cork, letters, 1816-1820 (folio 16); (iii) Barsloisnoch in Kilmartin, letter, 1797 (folio 49); (iv) Lingard and Sadler's Mill, Blink Street, Southwark, invoices and valuation, 1789-1795 (folio 50); (iv) Millbank Penitentiary, correspondence and estimates concerning mill at, 1816, 1818-1821 (folio 59); (v) Shirley Mill, Croydon, letters and account, 1810-1812 (folio 82); (vi) Taplow, Buckinghamshire, valuation, 1818 (folio 88); (vii) Wandsworth, deposition by John Rennie concerning obstructions to, 1804 (folio 92); (viii) Baxters' Mill, Dean Village, letters, 1815 (folio 94); (ix)-(xiii) Powder and Armoury mills. (x) Enfield lock, letter and report, 1811, 1813 (folio 98); (x) Lewisham, report and letter, 1807, 1817 (folio 104); (xi) Paddington, near Abinger, notice, 1790 (folio 110); (xii) Ramhurst near Tunbridge, letter and card, 1811 (folio 111); (xiii)-(xvi) Sawmills. (xiv) Darien, Georgia, letter, 1820 (folio 114); (xiv) Fisherrow, letter, 1807 (folio 116); (xv) Correspondence regarding disputed accounts for the sawmill constructed for Christopher Idle, 1816-1817 (folio 118).