| RefNo | Title | Date |
| EC/1877/10 | McIntos, William Carmichael: certificate of election to the Royal Society | |
| NLB/73/339 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Sidney Harmer, K.B.E., FRS | 13 June 1931 |
| IM/Maull/002880 | McIntosh, William Carmichael | nd |
| NLB/10/1033 | Copy letter from Herbert Rix, to Professor William Carmichael McIntosh, Fellow of the Royal Society, Marine Laboratory, St Andrew's, North Britain | 27 March 1895 |
| NLB/24/232 | Copy letter from Theodore E James, to Professor William Carmichael McIntosh, Fellow of the Royal Society | 8 April 1902 |
| NLB/19/707 | Copy telegram from an unknown correspondent, to William Carmichael McIntosh, [Fellow of the Royal Society], 2 Abbotsford Crescent, St Andrews, Scotland | [28 November 1899] |
| NLB/20/229 | Copy letter from Robert William Frederick Harrison, to Professor William Carmichael McIntosh, Fellow of the Royal Society, 2 Abbotsford Crescent, St Andrews, N.B. | 27 February 1900 |
| NLB/20/240 | Copy letter from Robert William Frederick Harrison, to Professor William Carmichael McIntosh, Fellow of the Royal Society | 5 March 1900 |
| NLB/22/484 | Copy letter from Robert William Frederick Harrison, to Professor [William Carmichael] McIntosh, [Fellow of the Royal Society] | 22 May 1901 |
| NLB/22/692 | Copy letter from Robert William Frederick Harrison, to Professor [William Carmichael] McIntosh, [Fellow of the Royal Society] | 26 June 1901 |
| NLB/22/744 | Copy letter from Robert William Frederick Harrison, to Professor [William Carmichael] McIntosh, [Fellow of the Royal Society] | 10 July 1901 |
| NLB/22/754 | Copy letter from unknown correspondent, to [William Carmichael] McIntosh, Fellow of the Royal Society | 10 July 1901 |
| NLB/23/1/315 | Copy letter from Michael Foster, to Professor William Carmichael McIntosh, Fellow of the Royal Society | 24 October 1901 |
| NLB/27/263 | Copy letter from Michael Foster, to Professor William Carmichael McIntosh, Fellow of the Royal Society | 29 July 1903 |
| NLB/28/168 | Copy letter from Robert William Frederick Harrison, to Professor William Carmichael McIntosh, Fellow of the Royal Society | 25 January 1904 |
| NLB/31/481 | Copy letter from Robert William Frederick Harrison, to Professor William Carmichael McIntosh, Fellow of the Royal Society | 26 September 1905 |
| NLB/32/597 | Copy letter from Theodore E James, to Professor William Carmichael McIntosh, Fellow of the Royal Society, Nevay Park, Meigle | 11 April 1906 |
| NLB/37/193 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney John] Hickson FRS | 13 February 1908 |
| NLB/36/430 | Copy letter from Robert William Frederick Harrison, to Professor William Carmichael McIntosh, Fellow of the Royal Society | 28 October 1907 |
| NLB/36/565 | Copy letter from Robert William Frederick Harrison, to Professor William Carmichael McIntosh, Fellow of the Royal Society | 14 November 1907 |
| NLB/46/28 | Copy letter from Robert William Frederick Harrison, to Professor William Carmichael McIntosh, Fellow of the Royal Society | 24 May 1912 |
| NLB/43/570 | Copy letter from Robert William Frederick Harrison, to Professor [William Carmichael] Mackintosh, Fellow of the Royal Society | 13 February 1911 |
| NLB/46/21 | Copy letter from Robert William Frederick Harrison, to Professor William Carmichael McIntosh, Fellow of the Royal Society | 23 May 1912 |
| NLB/46/254 | Copy letter from Robert William Frederick Harrison, to Professor [William Carmichael] McIntosh, Fellow of the Royal Society | 1 July 1912 |
| NLB/45/710 | Copy letter from Robert William Frederick Harrison to Professor W [William] C [Carmichael] McIntosh FRS | 27 April 1912 |
| NLB/47/138 | Copy letter from Robert William Frederick Harrison to Professor W [William] C [Carmichael] McIntosh FRS | 6 December 1912 |
| NLB/48/693 | Copy letter from Robert William Frederick Harrison, to Professor [William Carmichael] McIntosh, Fellow of the Royal Society | 26 September 1913 |
| NLB/50/802 | Copy letter from Robert William Frederick Harrison, to Professor [William Carmichael] McIntosh, Fellow of the Royal Society | 9 November 1914 |
| NLB/50/420 | Copy letter from Robert William Frederick Harrison, to Professor [William Carmichael] McIntosh, Fellow of the Royal Society | 7 July 1914 |
| NLB/51/359 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Professor William Carmichael McIntosh FRS | 23 February 1915 |
| NLB/51/308 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Professor William Carmichael McIntosh FRS | 8 February 1915 |
| NLB/50/655 | Copy letter from Robert William Frederick Harrison, to Professor [William Carmichael] McIntosh, Fellow of the Royal Society | 2 October 1914 |
| NLB/50/621 | Copy letter from Robert William Frederick Harrison, to Professor [William Carmichael] McIntosh, Fellow of the Royal Society | 29 September 1914 |
| NLB/50/840 | Copy letter from Robert William Frederick Harrison, to Professor [William Carmichael] McIntosh, Fellow of the Royal Society | 16 November 1914 |
| NLB/51/811 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Professor William Carmichael McIntosh FRS | 6 July 1915 |
| NLB/52/616 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor William Carmichael McIntosh, FRS | 28 January 1916 |
| RR/10/297 | Referee's report by William Carmichael M'Intosh, on a paper 'On Phymosoma varians' by Arthur Everett Shipley | 18 June 1889 |
| NLB/59/67 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor [William Carmichael] McIntosh, FRS | 14 July 1920 |
| NLB/63/151 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [William Carmichael] McIntosh, FRS | 07 July 1922 |
| NLB/60/344 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Professor [William Carmichael] McIntosh, FRS | 21 January 1921 |
| NLB/59/919 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor [William Carmichael] McIntosh, FRS | 1 December 1920 |
| NLB/61/466 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [William Carmichael] McIntosh, FRS; The Ray Society | 9 July 1921 |
| NLB/64/408 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Professor [William Carmichael] McIntosh, FRS | 9 April 1923 |
| NLB/64/245 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Professor [William Carmichael] McIntosh, FRS | 27 February 1923 |
| NLB/64/412 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Ing. Ctibor Blatny; Department of Zoology, Czech Polytechnical High-school, Prague | 9 April 1923 |
| NLB/19/607 | Copy letter from Arthur William Rucker, to Professor William Carmichael McIntosh Fellow of the Royal Society | 8 November 1899 |
| NLB/66/84 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to [William Carmichael] McIntosh, FRS | 19 February 1924 |
| NLB/14/251 | Copy letter from Michael Foster, to Professor William Carmichael McIntosh, Fellow of the Royal Society | 2 February 1897 |
| NLB/37/301 | Copy letter from Archibald Geikie to Professor [William Carmicheal] McIntosh | 27 February 1908 |
| RR/8/50 | Second letter from William Carmichael McIntosh, to George Gabriel Stokes, regarding a paper 'On the structure of Magelona' by William Carmichael McIntosh | 19 May 1877 |
| MC/11/74 | Letter from W C [William Carmichael] McIntosh, Murthly, to Professor G G [George Gabriel] Stokes, Secretary of the Royal Society | 9 June 1877 |
| MC/11/117 | Letter from W C [William Carmichael] McIntosh, Edinburgh, to Professor G G [George Gabriel] Stokes, Secretary of the Royal Society | 31 October 1877 |
| MC/11/112 | Letter from W C [William Carmichael] McIntosh, Edinburgh, to Professor G G [George Gabriel] Stokes, Secretary of the Royal Society | 31 October 1877 |
| MC/11 | Volume 11 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1877-1879 |
| RR/8/49 | Letter from William Carmichael McIntosh, to George Gabriel Stokes, regarding a paper 'On the structure of Magelona' by William Carmichael McIntosh | 24 April 1877 |
| AP/64/6 | Unpublished paper, 'On the intra-ovarian egg of some osseous fishes' by Robert [Francis] Scharff | 1886 |
| AP/73/4 | Unpublished paper, 'Fragmentation in Lineus gesserensis' by Alexander Brown | 1897 |
| AP/66/23 | Unpublished paper, 'Some stages in the development of the brain of Clupea harengus [Atlantic herring]' by Ernest W L [William Lyons] Holt | 1890 |
| AP/73/4/1 | Unpublished manuscript, 'Fragmentation in Lineus gesserensis' by Alexander Brown | 1897 |
| RR/8/48 | Referee's report by Edwin Ray Lankester, on a paper 'On the structure of Magelona' by William Carmichael McIntosh | 19 March 1877 |
| NLB/19/564 | Copy letter from Robert William Frederick Harrison, to Sir Fleetwood Isham Edwards | 2 November 1899 |
| NLB/19/602 | Copy letter from Robert William Frederick Harrison, to Sir Fleetwood Isham Edwards | 8 November 1899 |
| AP/75/9 | Unpublished paper, 'Development of the layers of the retina in the chick after the formation of the optic cup' by John Cameron | 1902 |
| AP/75/9/1 | Unpublished manuscript, 'Development of the layers of the retina in the chick after the formation of the optic cup' by John Cameron | 1902 |
| NLB/38/637 | Copy letter from Archibald Geikie, to Professor [William Carmichael] McIntosh, Fellow of the Royal Society, University of St Andrews | 15 October 1908 |
| NLB/38/631 | Copy letter from Robert William Frederick Harrison, to Professor William Carmichael McIntosh, Fellow of the Royal Society | 13 October 1908 |
| NLB/37/253 | Copy letter from Archibald Geikie to Professor W [William] C [Carmichael] McIntosh | 22 February 1908 |
| NLB/37/521 | Copy letter from Robert William Frederick Harrison to Professor [William Carmichael] McIntosh, Fellow of the Royal Society | 2 April 1908 |
| NLB/37/352 | Copy letter from Robert William Frederick Harrison to John Hopkinson, Secretary, Ray Society, Weetwood, Watford | 6 March 1908 |
| MC/17 | Volume 17 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1897-1899 |