| Reference number | Title | Date |
| AP/20/10 | Some account of the appearances of the Solar Spots, as seen from the Hereford, on the 15th & 16th of May 1836 during and after the Solar Eclipse | 6 June 1836 |
| MC/2 | Volume 2 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1832-1838 |
| DM/6/24 | Letter from Sir Henry Ellis to C R Weld, Assistant Secretary, Royal Society | 23 January 1856 |
| DM/6/18 | Letter from Sir Henry Ellis to C R Weld, Assistant Secretary, Royal Society | 31 May 1855 |
| DM/6/25 | Letter from Sir Henry Ellis to C R Weld, Assistant Secretary, Royal Society | 22 January 1856 |
| AP/23/9 | Experiments made on a piece of Pena Silver, as to its capability of holding water; saved from the Lady Charlotte, wrecked on the Coast of Ireland in December 1838 | January 1839 |
| MC/5 | Volume 5 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1851-1858 |
| MS/425/1 | Copy letter, John William Lubbock, Treasurer of the Royal Society, to Henry Ellis, British Museum | 13 December 1830 |
| MC/1 | Volume 1 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1800-1831 |
| DM/2/51 | Letter from Henry Ellis, British Museum, to P M Roget | 27 December 1829 |
| EC/1811/10 | Ellis, Sir Henry: certificate of election to the Royal Society | |
| MC/1/165 | Letter from Henry Ellis, [Assistant Keeper of Printed Books], British Museum, to Davies Gilbert, President of the Royal Society | 30 December 1828 |
| MC/1/172 | Letter from Edward Sabine, 1 Devonshire Place, to Dr. Peter Mark Roget, 39 Bernard Street | 13 July 1829 |
| MC/2/224 | Letter from Henry Ellis, [Principal Librarian at the] British Museum, to John David Roberton, [Assistant Secretary of the Royal Society] | 14 October 1836 |
| MC/5/173 | Letter from Henry Ellis, Principal Librarian at the British Museum, to Colonel [Edward] Sabine, Treasurer of the Royal Society | 26 July 1854 |