| Reference number | Title | Date |
| EC/1895/14 | Macewen, Sir William: certificate of election to the Royal Society | |
| EC/1895/15 | Macewen, Sir William: certificate of election to the Royal Society | |
| NLB/33/106 | Copy letter from Archibald Geikie, to Sir William Macewen, Fellow of the Royal Society | [29] June 1906 |
| NLB/33/107 | Copy letter from Robert William Frederick Harrison, to Sir William [Macewen], [Fellow of the Royal Society] | 29 June 1906 |
| NLB/34/375 | Copy letter from Archibald Geikie, to Sir William Macewen, Fellow of the Royal Society | 10 January 1907 |
| NLB/34/236 | Copy letter from Archibald Geikie, to Sir William Macewen, Fellow of the Royal Society | 14 December 1906 |
| NLB/35/366 | Copy letter from Robert William Frederick Harrison, to Sir William Macewen, Fellow of the Royal Society | 23 May 1907 |
| NLB/35/426 | Copy letter from Robert William Frederick Harrison, to Sir William Macewen, Fellow of the Royal Society | 31 May 1907 |
| NLB/34/813 | Copy letter from Archibald Geikie, to Sir William Macewen, Fellow of the Royal Society | 13 March 1907 |
| NLB/43/396 | Copy letter from Robert William Frederick Harrison, to Sir William Macewen, Fellow of the Royal Society | 20 December 1910 |
| NLB/51/18 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to Sir William Macewen FRS | 20 November 1914 |
| RR/17/196 | Referee's report by Sidney Harris Cox Martin, on a paper 'The rôle of the various elements in the development and regeneration of bone' by William Macewen | 19 February 1907 |
| RR/17/195 | Referee's report by Edward Albert Sharpey-Schafer, on a paper 'The rôle of the various elements in the development and regeneration of bone' by William Macewen | [February 1907] |
| NLB/56/359 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir William Macewen, FRS | 21 January 1919 |
| RR/8/331 | Referee's report by George Busk, on a paper 'Observations concerning transplantation of bone. Illustrated by a case of inter-human osseous transplantation, whereby over two-thirds of the shaft of a humerus was restored' by William Macewen | 10 May 1881 |
| RR/25/29 | Referee's report by William Macewen, on a paper 'Recherches anatomo-cliniques sur les névromes d'amputations douloureux. Nouvelles contributions à l'étude de la régénération nerveuse et du neurotropisme' by G Marinesco | [January 1919] |
| NLB/66/309 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir [William] Watson Cheyne, Bart., FRS | 7 April 1924 |
| NLB/34/551 | Copy letter from Robert William Frederick Harrison, to Sir William Macewen, Fellow of the Royal Society | 6 February 1907 |
| NLB/34/842 | Copy letter from Archibald Geikie, to Sir William Macewen, Fellow of the Royal Society | 18 March 1907 |
| RR/17/197 | Referee's report by William Watson Cheyne, on a paper 'The rôle of the various elements in the development and regeneration of bone' by William Macewen | [March 1907] |
| NLB/66/264 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to J. Patrick Esq., Charing Cross, Glasgow | 31 March 1924 |