| Reference number | Title | Date |
| IM/Maull/002888 | McKendrick, John Gray | nd |
| MS/377/1/74 | Postcard from John Gray McKendrick, 2 Buckingham Terrace, Glasgow, to William Fletcher Barrett, Kingstown, Ireland | 22 March 1906 |
| MS/377/1/75 | Postcard from John Gray McKendrick, Stonehaven, to [William Fletcher] Barrett, 6 De Vesci Terrace, Kingstown, Co Dublin | 1 November 1906 |
| IM/Maull/002887 | McKendrick, John Gray | nd |
| NLB/1/439 | Copy letter from Herbert Rix, to Professor John Gray McKendrick, Fellow of the Royal Society | 30 March 1887 |
| NLB/7/399 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 7 February 1893 |
| NLB/8/503 | Copy letter from Herbert Rix, to Professor John Gray McKendrick, Fellow of the Royal Society, 2 Florentine Gardens, Glasgow | 6 November 1893 |
| NLB/9/833 | Copy letter from Professor John Gray McKendrick, Fellow of the Royal Society, Eldergrove, Stonehaven, N.B. | 17 July 1894 |
| NLB/10/528 | Copy letter from Herbert Rix, to Professor John Gray McKendrick, Fellow of the Royal Society, Veterinary College, 10 Red Lion Square, E.C. | 12 December 1894 |
| NLB/10/771 | Copy letter from Herbert Rix, to Professor John Gray McKendrick, Fellow of the Royal Society, University of Glasgow | 2 February 1895 |
| NLB/11/246 | Copy letter from Herbert Rix, to Professor John Gray McKendrick, Fellow of the Royal Society | 20 May 1895 |
| NLB/12/363 | Copy letter from Herbert Rix, to Professor John Gray McKendrick, Fellow of the Royal Society | 6 February 1896 |
| RR/15/184 | Referee's report by John Gray McKendrick, on a paper 'Observations on the visual purple of the retina' by F W Edridge Green | 19 November 1901 |
| NLB/14/468 | Copy letter from Robert William Frederick Harrison, to Professor John Gray McKendrick, Fellow of the Royal Society | 16 March 1897 |
| NLB/16/132 | Copy letter from Robert William Frederick Harrison, to Professor J G McKendrick, Fellow of the Royal Society | 8 February 1898 |
| NLB/20/540 | Copy letter from Robert William Frederick Harrison, to Professor William Abbott Herdman, Fellow of the Royal Society | 17 May 1900 |
| NLB/21/802 | Copy letter from Robert William Frederick Harrison, to Professor John Gray McKendrick, Fellow of the Royal Society | 5 February 1901 |
| NLB/28/349 | Copy letter from Robert William Frederick Harrison, to Professor John Gray McKendrick, Fellow of the Royal Society | 22 February 1904 |
| NLB/28/351 | Copy letter from Robert William Frederick Harrison, to Professor John Gray McKendrick, Fellow of the Royal Society | 22 February 1904 |
| NLB/35/721 | Copy letter from Archibald Geikie, to Professor John Gray McKendrick, Fellow of the Royal Society | 9 July 1907 |
| NLB/36/342 | Copy letter from Robert William Frederick Harrison, to Professor John Gray McKendrick, Fellow of the Royal Society, Maxieburn, Stonehaven, N.B. | 15 October 1907 |
| NLB/39/731 | Copy letter from Robert William Frederick Harrison to Dr A A Gray, 14 Newton Terrace, Glasgow | 2 March 1909 |
| NLB/39/708 | Copy letter from Robert William Frederick Harrison to Professor J [John] G [Gray] McKendrick, Fellow of the Royal Society | 26 February 1909 |
| NLB/46/256 | Copy letter from Robert William Frederick Harrison, to Professor John Gray McKendrick, Fellow of the Royal Society | 1 July 1912 |
| NLB/45/831 | Copy letter from Robert William Frederick Harrison to Professor J [John] G [Gray] McKendrick FRS, Maxieburn, Stonehaven, NB | 17 May 1912 |
| NLB/46/747 | Copy letter from Robert William Frederick Harrison, to Professor John Gray McKendrick, Fellow of the Royal Society | 28 October 1912 |
| NLB/50/799 | Copy letter from Robert William Frederick Harrison, to Professor [John Gray] McKendrick, Fellow of the Royal Society | 9 November 1914 |
| RR/21/166 | Referee's report by John Gray McKendrick, on a paper 'On the analysis of sound waves in the cochlea' by T Wrightson | [July 1914] |
| RR/7/324 | Referee's report by John Scott Burdon-Sanderson, on a paper 'On the physiological action of the chinoline and pyridine bases' by John Gray McKendrick and James Dewar | 13 December 1874 |
| RR/7/322 | Referee's report by Thomas Lauder Brunton, on a paper 'On the physiological action of the chinoline and pyridine bases' by John Gray McKendrick and James Dewar | 30 July 1874 |
| NLB/58/57 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor [John Gray] McKendrick, FRS | 5 March 1920 |
| RR/10/286 | Referee's report by John Gray McKendrick, on a paper 'A chemical inquiry into the phenomena of human respiration' by William Marcet | 25 June 1889 |
| RR/11/59 | Referee's report by John Gray McKendrick, on a paper 'On the physiology of asphyxia, and on the anæsthetic action of pure nitrogen' by George Johnson | 1891 |
| RR/11/201 | Referee's report by John Gray McKendrick, on a paper 'Contributions to the physiology and pathology of the mammalian heart' by Charles Smart Roy and John George Adami | 30 January 1892 |
| RR/12/203 | Referee's report by John Gray McKendrick, on a paper 'On hepatic glycogenesis' by Diarmid Noel Paton | 21 July 1893 |
| NLB/59/440 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor John [Gray] McKendrick, FRS; Maxieburn, Stonehaven | 4 October 1920 |
| RR/17/111 | Referee's report by John Gray McKendrick, on a paper 'The impulses of compound waves and their mechanical transmission through the ear' by Sir Thomas Wrightson | 6 February 1907 |
| NLB/60/794 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor John [Gray] McKendrick, FRS | 6 April 1921 |
| NLB/55/766 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [John Gray] McKendrick, FRS | 12 September 1918 |
| NLB/64/240 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [John Gray] McKendrick, FRS | 27 February 1923 |
| NLB/69/695 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Miss Olive Edis, W11 | 24 July 1926 |
| EC/1884/15 | McKendrick, John Gray: certificate of election to the Royal Society | |
| NLB/5/1224 | Copy letter from Herbert Rix, to Professor John GrayMcKendrick, Fellow of the Royal Society | 30 January 1892 |
| RR/15/71 | Referee's report by John Gray McKendrick, on a paper 'Contributions to the comparative anatomy of the mammalian eye, chiefly based on opthalmoscopic examination' by G Lindsay Johnson | June 1900 |
| RR/15/127 | Referee's report by John Gray McKendrick, on a paper 'The retinal current of the frog's eye, excited by light and excited electrically' by Dr Augustus Desire Waller | April 1900 |
| RR/15/130 | Referee's report by John Gray McKendrick, on a paper 'The 'blaze-currents' of the frog's eyeball' by Augustus Desire Waller | January 1901 |
| NLB/20/725 | Copy letter from Robert William Frederick Harrison, to Professor William Abbott Herdman, Fellow of the Royal Society | 23 June 1900 |
| NLB/20/726 | Copy letter from Robert William Frederick Harrison, to Professor William Dobinson Halliburton, Fellow of the Royal Society | 23 June 1900 |
| NLB/29/585 | Copy letter from Robert William Frederick Harrison, to Professor John Gray McKendrick, Fellow of the Royal Society | 9 November 1904 |
| NLB/39/638 | Copy letter from Robert William Frederick Harrison to Professor [David] Ferrier, Fellow of the Royal Society, Chairman of the Sectional Committee for Physiology | 19 February 1909 |
| MDA/C/12/1/5 | Letter from John Gray Mckendrick, University of Glasgow, to the Secretaries of the Royal Society | 12 February 1895 |
| RR/12/125 | Referee's report by John Gray McKendrick, on a paper 'On the constitution and mode of formation of "food vacuoles" in infusoria, as illustrated by the history of the processes of digestion in Carchesium polypinum' by Major Greenwood | 28 December 1893 |
| MC/13/69 | Letter from John G [Gray] McKendrick, University of Glasgow, to Professor G G [George Gabriel] Stokes, Secretary of the Royal Society | 17 June 1884 |
| MC/13 | Volume 13 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1884 |
| AP/71/6 | Unpublished paper, 'Observations on the analysis of voluntary muscular movements by certain new instruments' by William R Jack | 1895 |
| AP/71/6/1 | Unpublished manuscript, 'Observations on the analysis of voluntary muscular movements by certain new instruments' by William R Jack | 1895 |
| AP/73/10 | Unpublished paper, 'Some observations on the chemistry of the contents of the alimentary tract under various conditions; and on the influence of the bacteria present in them' by A [Alexander] Lockhart Gillespie | 1897 |
| RR/7/323 | Referee's report by George Harley, on a paper 'On the physiological action of the chinoline and pyridine bases' by John Gray McKendrick and James Dewar | 9 October 1874 |
| RR/11/45 | Referee's report by John Gray McKendrick, on the Croonian Lecture 'On the mammalian nervous system, its functions, and their localisation determined by an electrical method' by Francis Gotch and Victor Alexander Haden Horsley | 1891 |
| PP/23/28 | Paper, 'The refractive character of the eyes of horses' by Frederick Smith | 20 February 1894 |
| MC/16/280 | Letter from John [Gray] McKendrick, University of Glasgow, to Professor Michael Foster, Secretary of the Royal Society | 25 January 1896 |
| MC/16/65 | Letter from John [Gray] McKendrick, Glasgow, to Professor [Michael] Foster, Secretary of the Royal Society | 21 October 1893 |
| MC/16 | Volume 16 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1893-1896 |
| MC/19/593 | Letter from John [Gray] McKendrick, to Robert [William Frederick] Harrison, Assistant Secretary of the Royal Society | 20 February 1904 |
| MC/19/592 | Letter from John [Gray] McKendrick, Physiological Laboratory, University of Glasgow, to the Assistant Secretary of the Royal Society | 17 February 1904 |
| NLB/28/329 | Copy letter from Robert William Frederick Harrison, to Professor John Gray McKendrick, Fellow of the Royal Society | 19 February 1904 |
| MC/19 | Volume 19 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1904 |