| Reference number | Title | Date |
| NLB/2/490 | Copy letter from Herbert Rix, to Walter Gardiner, Clare College, Cambridge | 18 July 1888 |
| NLB/4/620 | Copy letter from Herbert Rix, to Walter Gardiner, Fellow of the Royal Society | 23 July 1890 |
| NLB/4/835 | Copy letter from Herbert Rix, to Walter Gardiner, Clare College, Cambridge | 7 November 1890 |
| NLB/5/865 | Copy letter from Herbert Rix, to Walter Gardiner, [Fellow of the Royal Society] | 6 November 1891 |
| NLB/23/2/34 | Copy letter from Sir Michael Foster, to [Walter] Gardiner, Fellow of the Royal Society, and A W Hill | 5 March 1901 |
| NLB/11/952 | Copy letter from Herbert Rix, to Walter Gardiner, Fellow of the Royal Society | 8 November 1895 |
| NLB/14/63 | Copy letter from Robert William Frederick Harrison, to Walter Gardiner, Fellow of the Royal Society, Clare College, Cambridge | 18 December 1896 |
| NLB/14/30 | Copy letter from Robert William Frederick Harrison, to Walter Gardiner, Fellow of the Royal Society, Clare College, Cambridge | 14 December 1896 |
| NLB/18/834 | Copy letter from Robert William Frederick Harrison, to [W] Gardiner, Clare College, Cambridge | [29 May 1899] |
| NLB/15/335 | Copy letter from Theodore E James, to Walter Gardiner, Fellow of the Royal Society | 11 August 1897 |
| NLB/15/334 | Copy letter from Theodore E James, to William Turner Thiselton-Dyer, Fellow of the Royal Society | 11 August 1897 |
| NLB/21/230 | Copy letter from Robert William Frederick Harrison, to Walter Gardiner, Fellow of the Royal Society, and Arthur W Hill | 8 October 1900 |
| NLB/21/303 | Copy letter from Michael Foster, to Walter Gardiner, [Fellow of the Royal Society] | 25 October 1900 |
| NLB/21/363 | Copy letter from Robert William Frederick Harrison, to Walter Gardiner [Fellow of the Royal Society] and Arthur W Hill | 5 November 1900 |
| NLB/21/418 | Copy letter from Robert William Frederick Harrison, to Walter Gardiner, Fellow of the Royal Society | 16 November 1900 |
| NLB/51/244 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Professor Stanley Gardiner FRS | 22 January 1915 |
| RR/9/139 | Referee's report by Edwin Ray Lankester, on a paper 'On the continuity of the protoplasm through the walls of vegetable cells' by Walter Gardiner | 13 October 1883 |
| RR/9/140 | Referee's report by Francis Darwin, on a paper 'On the continuity of the protoplasm through the walls of vegetable cells' by Walter Gardiner | 1883 |
| RR/14/267 | Referee's report by Walter Gardiner, on a paper 'Onygena equina, Willd., a horn-destroying fungus' by Harry Marshall Ward | nd [May 1899] |
| MS/427/245 | Copy letter from [George Gabriel] Stokes, Secretary of the Royal Society; to the Secretary of the Treasury | 11 January 1883 |
| MS/427/435 | Note of a letter from [George Gabriel] Stokes, Secretary of the Royal Society; to the Secretary of the Treasury | 25 June 1885 |
| MM/17/100 | Letter from Walter Gardiner to Herbert Rix, Assistant Secretary, Royal Society | 7 November 1895 |
| EC/1890/05 | Gardiner, Walter: certificate of election to the Royal Society | |
| NLB/4/487 | Copy letter from Herbert Rix, to Walter Gardiner, Fellow of the Royal Society | 16 June 1890 |
| NLB/15/626 | Copy letter from Robert William Frederick Harrison, to Walter Gardiner, Fellow of the Royal Society | 5 November 1897 |
| NLB/21/378 | Copy letter from Michael Foster, to [Walter] Gardiner, [Fellow of the Royal Society] | 8 November 1900 |
| RR/15/53 | Referee's report by Dukinfield Henry Scott, on a paper 'The histology of the cell wall with special reference to the mode of connection of cells' by Arthur William Hill and Walter Gardiner | 6 August 1900 |
| MC/13/2 | Letter from Walter Gardiner, 10 Wheeler Street, Cambridge, to the Royal Society | 14 January 1884 |
| MC/13 | Volume 13 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1884 |
| PP/2/28 | Paper, 'On the continuity of the protoplasm in the motile organs of leaves' by Walter Gardiner | 1882 |
| PP/7/7 | Paper, 'On the phenomena accompanying stimulation of the gland-cells in the tentacles of Drosera dichotoma' by Walter Gardiner | 1885 |
| PP/10/44 | Paper, 'On the structure of the mucilage cells of Blechnum occidentale (L) and Osmunda regalis (L)' by Tokutarô Itô and Walter Gardiner | 1887 |
| PP/11/9 | Paper, 'On the power of contractility exhibited by the protoplasm of certain plant cells' by Walter Gardiner | 1887 |
| RR/15/54 | Referee's report by John Bretland Farmer, on a paper 'The histology of the cell wall with special reference to the mode of connection of cells' by Arthur William Hill and Walter Gardiner | August 1900 |
| NLB/17/456 | Copy letter from Arthur William Rucker, to Lieutenant Colonel the Right Honourable Sir Fleetwood Isham Edwards | 3 November 1898 |
| NLB/17/506 | Copy letter from Michael Foster, to Walter Gardiner, Fellow of the Royal Society | 9 November 1898 |
| MC/17 | Volume 17 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1897-1899 |