| Reference number | Title | Date |
| IM/Maull/005841 | Forsyth, Andrew Russell | nd |
| IM/000985 | Forsyth, Andrew Russell and others | nd |
| NLB/20/814 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 13 July 1900 |
| IM/001504 | Forsyth, Andrew Russell | nd |
| IM/001506 | Forsyth, Andrew Russell | circa 1885 |
| IM/001508 | Forsyth, John | nd |
| IM/001507 | Forsyth, Christina (nee Glen) | nd |
| IM/000957 | Corkers Club | nd |
| NLB/32/201 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 25 January 1906 |
| NLB/2/83 | Copy letter from Herbert Rix, to John William Strutt, 3rd Baron Rayleigh | 7 January 1888 |
| NLB/7/177 | Copy letter from Herbert Rix, to Dr Andrew Russell Forsyth, Fellow of the Royal Society | 14 December 1892 |
| NLB/11/376 | Copy letter from Herbert Rix, to Professor Andrew Russell Forsyth, care of Andrew Russell, 14 Amberley Street, Liverpool | 18 June 1895 |
| NLB/22/24 | Copy telegram from Robert William Frederick Harrison, to Andrew Russell Forsyth [Fellow of the Royal Society], Trinity College, Cambridge | 13 February 1901 |
| NLB/11/753 | Copy letter from Herbert Rix, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 1 October 1895 |
| NLB/12/171 | Copy letter from Herbert Rix, to Major Percy Alexander MacMahon, Fellow of the Royal Society | 23 December 1895 |
| NLB/13/584 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 12 October 1896 |
| NLB/13/600 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 14 October 1896 |
| NLB/12/105 | Copy letter from Herbert Rix, to Professor Michael Foster, Secretary, Royal Society | 6 December 1895 |
| NLB/19 | New Letter Book volume 19, copy letters sent from Royal Society administration | 1 June 1899-10 January 1900 |
| NLB/21 | New Letter Book volume 21, copy letters sent from Royal Society administration | 14 July 1900-7 February 1901 |
| RR/15/175 | Memoranda from Robert William Frederick Harrison, and reply from Andrew Russell Forsyth, on a paper 'The pear shaped and other figures of equilibrium of a rotating mass of liquid' by George Howard Darwin | 21 October 1901 |
| NLB/14/396 | Copy letter from Edward Frankland, to Professor Andrew Russell Forsyth, Foreign Secretary, Royal Society | 4 March 1897 |
| NLB/14/479 | Copy letter from Arthur William Rucker, to Professor Alfred George Greenhill, [Fellow of the Royal Society] | 17 March 1897 |
| RR/16/162 | Referee's report by Andrew Russell Forsyth, on a paper 'On the normal series satisfying linear differential equations' by E Cunningham | 13 December 1904 |
| NLB/16/34 | Copy letter from Robert William Frederick Harrison, to Professor Forsyth, Fellow of the Royal Society | 17 January 1898 |
| NLB/14/707 | Copy letter from Robert William Frederick Harrison, to Dr Joseph Larmor, Professor Olaus Magnus Friedrich Erdmann Henrici, Professor Andrew Russell Forsyth, Professor Walter Elliot Elliot, Dr Ernest William Hobson, Fellows of the Royal Society | 28 April 1897 |
| RR/16/56 | Referee's report by William Burnside, on a paper 'The differential invariants of space' by Andrew Russell Forsyth | July 1903 |
| RR/16/52 | Referee's report by Percy Alexander MacMahon, on a paper 'The differential invariants of a surface, and their geometric significance' by Andrew Russell Forsyth | 24 February 1903 |
| RR/17/198 | Referee's report by Andrew Russell Forsyth, on a paper 'Preliminary note on the operational invariants of a binary quantic' by Percy Alexander MacMahon | 31 October 1907 |
| NLB/22/503 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth, Fellow of the Royal Society | 24 May 1901 |
| NLB/15/541 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 25 October 1897 |
| NLB/15/552 | Copy letter from Arthur William Rucker, to Andrew Russell Forsyth, [Fellow of the Royal Society] | 27 October 1897 |
| NLB/15/433 | Copy letter from Robert William Frederick Harrison, to Professor Alfred George Greenhill, Fellow of the Royal Society | 2 October 1897 |
| NLB/15/508 | Copy letter from Arthur William Rucker, to Andrew Russell Forsyth, [Fellow of the Royal Society] | 19 October 1897 |
| NLB/15/610 | Copy letter from Arthur William Rucker, to Lieutenant Colonel the Right Honourable Sir Fleetwood Isham Edwards | 4 November 1897 |
| NLB/15/587 | Copy letter from Arthur William Rucker, to Andrew Russell Forsyth, [Fellow of the Royal Society] | 1 November 1897 |
| NLB/18/293 | Copy letter from Robert William Frederick Harrison, to Professor Forsyth, Fellow of the Royal Society | 20 February 1899 |
| NLB/22/20 | Copy telegram from Robert William Frederick Harrison, to [Professor Andrew Russell] Forsyth, [Fellow of the Royal Society], Trinity College, Cambridge | 13 February 1901 |
| NLB/15/435 | Copy letter from Robert William Frederick Harrison, to Professor Alfred George Greenhill, Fellow of the Royal Society | 4 October 1897 |
| NLB/15/476 | Copy letter from Arthur William Rucker, to Andrew Russell Forsyth, [Fellow of the Royal Society] | 11 October 1897 |
| NLB/15/785 | Copy letters sent from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 10 December 1897 |
| NLB/18/89 | Copy letter from Robert William Frederick Harrison, to Professor A R Forsyth, Fellow of the Royal Society, Trinity College, Cambridge | 12 January 1899 |
| NLB/15/871 | Copy letter from Robert William Frederick Harrison, to George Howard Darwin, Fellow of the Royal Society | 5 January 1897 |
| NLB/18/266 | Copy letter from Robert William Frederick Harrison, to Professor [A R] Forsyth, [Fellow of the Royal Society] | 14 February 1899 |
| NLB/19/477 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 11 October 1899 |
| NLB/18/234 | Copy letter from Robert William Frederick Harrison, to Professor A R Forsyth, Fellow of the Royal Society | 9 February 1899 |
| NLB/18/106 | Copy letter from Robert William Frederick Harrison, to Professor A R Forsyth, Fellow of the Royal Society | 17 January 1899 |
| NLB/18/833 | Copy letter from an unknown correspondent, to [Professor A R] Forsyth, Trinity College, Cambridge | [29 May 1899] |
| NLB/18/161 | Copy letter from Arthur William Rucker, to [Professor A R] Forsyth | 27 January 1899 |
| NLB/19/511 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 19 October 1899 |
| NLB/18/57 | Copy letter from Robert William Frederick Harrison, to Professor Forsyth, Fellow of the Royal Society | 7 January 1899 |
| NLB/19/562 | Copy letter from Arthur William Rucker, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 1 November 1899 |
| NLB/19/834 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 5 January 1900 |
| NLB/18/419 | Copy letter from Robert William Frederick Harrison, to Professor A R Forsyth, Fellow of the Royal Society | 8 March 1899 |
| NLB/22/119 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth | 6 March 1901 |
| NLB/19/535 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 27 October 1899 |
| NLB/20/50 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 22 January 1900 |
| NLB/19/767 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 13 December 1899 |
| NLB/20/745 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 28 June 1900 |
| NLB/20/63 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 24 January 1900 |
| NLB/20/204 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, [Fellow of the Royal Society] | 23 February 1900 |
| NLB/20/58 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society, Chairman of the Mathematical Committee | 23 January 1900 |
| NLB/20/118 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 5 February 1900 |
| NLB/20/205 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, [Fellow of the Royal Society], Chairman of the Mathematics Committee | 23 February 1900 |
| NLB/11/712 | Copy letter from Herbert Rix, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 23 September 1895 |
| NLB/20/123 | Copy letter from Arthur William Rucker, to Andrew Russell Forsyth, [Fellow of the Royal Society] | 7 February 1900 |
| NLB/20/241 | Copy letter from Arthur William Rucker, to Andrew Russell Forsyth, [Fellow of the Royal Society] | 5 March 1900 |
| NLB/20/343 | Copy letter from Arthur William Rucker, to Dr Hobson | 28 March 1900 |
| NLB/20/433 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 25 April 1900 |
| NLB/20/786 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 10 July 1900 |
| NLB/21/120 | Copy letter from Theodore E James, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 1 August 1900 |
| NLB/20/722 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth | 25 June 1900 |
| NLB/20/729 | Copy letter from Robert William Frederick Harrison, to Dr Thomas Edward Thorpe, Foreign Secretary, Royal Society | 26 June 1900 |
| NLB/22/5 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 9 February 1901 |
| NLB/22/16 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth, Fellow of the Royal Society | 12 February 1901 |
| NLB/22/25 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth, Fellow of the Royal Society, Trinity College, Cambridge | 13 February 1901 |
| NLB/22/70 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth, Fellow of the Royal Society | 25 February 1901 |
| NLB/22/109 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth, Fellow of the Royal Society | 5 March 1901 |
| NLB/22/108 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth, Fellow of the Royal Society | 5 March 1901 |
| NLB/21/720 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 17 January 1901 |
| NLB/22/637 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth, Fellow of the Royal Society | 19 June 1901 |
| NLB/21/266 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 15 October 1900 |
| NLB/21/380 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 7 November 1900 |
| NLB/23/2/432 | Copy letter sent from Archibald Geikie, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | January 1904 |
| NLB/21/536 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 5 December 1900 |
| NLB/21/452 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society, Chairman of the Mathematics Committee | 20 November 1900 |
| NLB/23/1/483 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 19 November 1901 |
| NLB/22/479 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth, Fellow of the Royal Society, Chairman of the Mathematics Committee | 22 May 1901 |
| NLB/22/493 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth, Fellow of the Royal Society | 23 May 1901 |
| NLB/22/624 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth, Fellow of the Royal Society | 15 June 1901 |
| NLB/21/791 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 31 January 1901 |
| NLB/23/1/298 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 22 October 1901 |
| NLB/21/703 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 11 January 1901 |
| NLB/23/1/300 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 28 October 1901 |
| NLB/23/1/188 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 9 October 1901 |
| NLB/23/1/223 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 12 October 1901 |
| NLB/23/1/146 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society, Chairman of the Mathematical Sectional Committee | 1 October 1901 |
| NLB/23/2/103 | Copy letter from Alfred Bray Kempe, to Professor Andrew Russell Forsyth, Chairman of the Mathematic Committee and other Sectional Committee Chairmen | 29 June 1901 |
| NLB/23/1/247 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 16 October 1901 |
| NLB/23/2/312 | Copy letter sent from Joseph Larmor, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 20 March 1903 |
| NLB/23/1/358 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 30 October 1901 |
| NLB/23/1/372 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 2 November 1901 |
| NLB/23/1/506 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 22 November 1901 |
| NLB/26/239 | Copy letter from the Secretaries of the Royal Society to, Professor Andrew Russell Forsyth, Fellow of the Royal Society | 16 February 1903 |
| NLB/27/64 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 25 June 1903 |
| NLB/27/583 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 23 October 1903 |
| RR/23/9 | Letter from Andrew Russell Forsyth, on a paper 'The scattering of plane electric waves by spheres' by Thomas John I'Anson Bromwich | 5 July 1916 |
| NLB/27/658 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, [Fellow of the Royal Society] | 10 November 1903 |
| NLB/30/264 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 21 February 1905 |
| NLB/28/481 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 14 March 1904 |
| NLB/32/51 | Copy letter from Joseph Larmor, to Sir William Niven, [Fellow of the Royal Society] | 17 December 1905 |
| NLB/32/225 | Copy letter from Joseph Larmor, to Professor William Burnside, Fellow of the Royal Society | 1 February 1906 |
| NLB/32/524 | Copy letter from Robert William Frederick Harrison, to Professor William Burnside, Fellow of the Royal Society, Chairman of the Mathematics Sectional Committee | 26 March 1906 |
| NLB/71/269 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [Andrew Russell] Forsyth, FRS | 6 March 1928 |
| NLB/39/500 | Copy letter from Joseph Larmor to Professor [Andrew Russell] Forsyth | Undated |
| NLB/54/85 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Messrs Harrison & Sons | 5 February 1917 |
| NLB/50/149 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth, Fellow of the Royal Society | 7 May 1914 |
| NLB/52/481 | Copy letter from [Robert William Frederick Harrison, Assistant Secretary of the Royal Society]; to Messrs Harrison & Sons | 17 December 1915 |
| NLB/56/300 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Andrew Russell] Forsyth, Chairman of the International Catalogue Committee and FRS | 9 January 1919 |
| NLB/23/1 | Copy letters sent from Royal Society administrative staff and officers | 2 August 1901-12 February 1902 |
| NLB/56/16 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Andrew Russell] Forsyth, FRS | 4 November 1918 |
| NLB/56/314 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Andrew Russell] Forsyth, Chairman of the International Catalogue Committee and FRS | 13 January 1919 |
| NLB/56/401 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Andrew Russell] Forsyth, Chairman of the International Catalogue Committee and FRS | 30 January 1919 |
| RR/9/28 | Referee's report by James Whitbread Lee Glaisher, on a paper 'Memoir on the Theta-functions, particularly those of two variables' by Andrew Russell Forsyth | 29 March 1882 |
| RR/10/292 | Referee's report by Andrew Russell Forsyth, on a paper 'On certain geometrical theorems' by William Henry Leighton Russell | 24 July 1889 |
| RR/9/29 | Referee's report by Henry John Stephen Smith, on a paper 'Memoir on the Theta-functions, particularly those of two variables' by Andrew Russell Forsyth | 5 June 1882 |
| NLB/56/461 | Copy letter from [Robert William Frederick Harrison, Assistant Secretary of the Royal Society]; to Professor [Andrew Russell] Forsyth, Chairman of the International Catalogue Committee and FRS | 14 February 1919 |
| RR/9/27 | Letter from James Whitbread Lee Glaisher, on a paper 'Memoir on the Theta-functions, particularly those of two variables' by Andrew Russell Forsyth | 2 March 1882 |
| NLB/56/698 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Andrew Russell] Forsyth, Chairman of the International Catalogue Committee and FRS | 29 April 1919 |
| NLB/56/693 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Andrew Russell] Forsyth, Chairman of the International Catalogue Committee and FRS | 16 April 1919 |
| NLB/56/640 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Andrew Russell] Forsyth, Chairman of the International Catalogue Committee and FRS | 3 April 1919 |
| NLB/56/557 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Andrew Russell] Forsyth, Chairman of the International Catalogue Committee and FRS | 12 March 1919 |
| NLB/56/773 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Andrew Russell] Forsyth, Chairman of the International Catalogue Committee and FRS | 22 May 1919 |
| RR/36/35 | Referee's report by Andrew Russell Forsyth, on a paper 'Adjoint differential equations' by F B Pidduck | 14 September 1927 |
| NLB/58/98 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor [Arthur Russell] Forsyth, FRS | 12 March 1920 |
| RR/11/118 | Referee's report by Andrew Russell Forsyth on a paper 'On the residues of powers of numbers any composite modulus, real or complex' by Geoffrey Thomas Bennett | 16 July 1892 |
| RR/11/53 | Letter from Andrew Russell Forsyth, on a paper 'On the locus of singular points and lines which occur in connection the theory of the locus of ultimate intersections of a system of surfaces' by Micaiah John Muller Hill | 27 October 1891 |
| RR/23/81 | Referee's report by Andrew Russell Forsyth, on a paper 'On the iteration of certain functions' by Ronald Ross | 13 July 1916 |
| RR/13/180 | Referee's report by Augustus Edward Hough Love, on a paper 'Memoir on the integration of partial differential equations second order in three independent variables when an intermediary integral does not exist in general' by Andrew Russell Forsyth | 24 January 1898 |
| RR/12/196 | Referee's report by Andrew Russell Forsyth, on a paper 'A certain class of generating functions in the theory of numbers' by Percy Alexander MacMahon | 28 December 1893 |
| RR/14/37 | Letter from Andrew Russell Forsyth, to Arthur William Rucker, regarding a paper 'Contributions to the theory of simultaneous partial differential equations' by Alfred Cardew Dixon | 24 January 1899 |
| RR/14/148 | Second referee's report by Andrew Russell Forsyth, on a paper 'On simultaneous partial differential equations' by Alfred Cardew Dixon | nd [1900] |
| RR/14/142 | Referee's report by Andrew Russell Forsyth, on a paper 'On simultaneous partial differential equations' by Alfred Cardew Dixon | 2 October 1899 |
| RR/10/163 | Letter from Arthur Cayley, to John William Strutt, 3rd Baron Rayleigh, regarding a paper 'A class of functional invariants' by Andrew Russell Forsyth | 7 June 1888 |
| RR/26/41 | Referee's report by Horace Lamb, on a paper 'Note on the Cable equations' by Andrew Russell Forsyth | nd [1921] |
| RR/14/150 | Third referee's report by Andrew Russell Forsyth, on a paper 'On simultaneous partial differential equations' by Alfred Cardew Dixon | 27 April 1900 |
| RR/26/42 | Referee's report by Horace Lamb, on a paper 'The vibrations of a circular membrane, slightly inelastic and symmetrically loaded' by Andrew Russell Forsyth | nd [1921] |
| NLB/61/76 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Andrew Russell] Forsyth, FRS | 5 May 1921 |
| NLB/62/648 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Andrew Russell] Forsyth, FRS | 31 March 1922 |
| RR/10/156 | Referee's report by Arthur Cayley, on a paper 'Invariants, convariants, and quotient-derivatives associated with linear differential equations' by Andrew Russell Forsyth | 8 February 1888 |
| RR/10/168 | Second letter from Arthur Cayley, to John William Strutt, 3rd Baron Rayleigh, regarding a paper 'A class of functional invariants' by Andrew Russell Forsyth | 29 November 1888 |
| NLB/66/316 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [Andrew Russell] Forsyth, FRS | 7 April 1924 |
| NLB/71/214 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [Andrew Russell] Forsyth, FRS | 12 February 1928 |
| IM/Maull/001505 | Forsyth, Andrew Russell | 1892 |
| IM/001509 | Forsyth, John | nd |
| NLB/8/266 | Copy letter from Theodore E James, to Professor Cayley, Fellow of the Royal Society | 11 September 1893 |
| RR/16/70 | Referee's report by Andrew Russell Forsyth, on a paper 'A generaliziation of the functions xn and gamma (n)' by Reverend F H Jackson | 16 December 1903 |
| NLB/15/624 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 5 November 1897 |
| NLB/15/556 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 28 October 1897 |
| NLB/15/717 | Copy letter from Arthur William Rucker, to Dr Ernest William Hobson, [Fellow of the Royal Society] | 13 November 1897 |
| NLB/18/163 | Copy letter from Robert William Frederick Harrison, to Professor [A R] Forsyth | 27 January 1899 |
| NLB/19/873 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 10 January 1900 |
| NLB/19/855 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 8 January 1900 |
| NLB/20/96 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forysth, Fellow of the Royal Society | 31 January 1900 |
| NLB/20/425 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 25 April 1900 |
| NLB/21/46 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 20 June 1900 |
| NLB/21/202 | Copy letter from Robert William Frederick Harrison, to Professor Henry Edward Armstrong, Professor Andrew Russell Forsyth, Sir Archibald Geikie, Professor Edwin Ray Lankester, Sir Joseph Norman Lockyer, Dr Thomas Edward Thorpe, [Fellows of the Royal Society] | 26 September 1900 |
| NLB/21/267 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 23 October 1900 |
| NLB/21/279 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 17 October 1900 |
| NLB/22/241 | Copy letter from Robert William Frederick Harrison, to Professor [Andrew Russell] Forsyth, Fellow of the Royal Society, Poste Restante, Arles, Bouches du Rhone | 28 March 1901 |
| NLB/21/675 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 8 January 1901 |
| NLB/21/736 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 21 January 1901 |
| NLB/23/2/204 | Copy letter from Sir Michael Foster, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 3 June 1902 |
| NLB/40/650 | Copy letter from Robert William Frederick Harrison to Professor A [Andrew] R [Russell] Forsyth FRS | 14 July 1909 |
| NLB/56 | New Letter Book volume 56, copy letters sent from Royal Society administration | 1 November 1918-27 June 1919 |
| RR/10/157 | Referee's report by James Whitbread Lee Glaisher, on a paper 'Invariants, convariants, and quotient-derivatives associated with linear differential equations' by Andrew Russell Forsyth | 3 April 1888 |
| MS/928/5/1/3 | Letter from Andrew Russell Forsyth, Bailey's Hotel, Gloucester Road, Kensington, to Geoffrey Vernon Boys | 20 March 1941 |
| RR/10/158 | Referee's report by Arthur Cayley, on a paper 'A class of functional invariants' by Andrew Russell Forsyth | 22 March 1888 |
| RR/13/68 | Referee's report by Andrew Russell Forsyth, on a paper 'Octonions' by Alex McAulay | 2 March 1896 |
| EC/1886/07 | Forsyth, Andrew Russell: certificate of election to the Royal Society | |
| NLB/16/460 | Copy letter from Robert William Frederick Harrison, to Professor A Vassilief, Universite, Karyan, Russia | 6 April 1898 |
| NLB/19/579 | Copy letter from Robert William Frederick Harrison, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 3 November 1899 |
| NLB/20/464 | Copy letter from Arthur William Rucker and Michael Foster, to the Secretaries, Königlich Preussische Akademie der Wissenschaften, Universitatsstrase, 8, Berlin, NW7 | 28 April 1900 |
| NLB/20/734 | Copy letter from Robert William Frederick Harrison, to Lord Kelvin [William Thomson], Fellow of the Royal Society | 27 June 1900 |
| NLB/22/26 | Copy letter from Robert William Frederick Harrison, to [Andrew Russell] Forsyth, Fellow of the Royal Society | 13 February 1901 |
| RR/10/89 | Referee's report by Andrew Russell Forsyth, on a paper 'On Hamilton's numbers' by James Joseph Sylvester and James Hammond | 16 July 1887 |
| RR/10/161 | Second letter from James Joseph Sylvester, to John William Strutt, 3rd Baron Rayleigh, regarding a paper 'A class of functional invariants' by Andrew Russell Forsyth | 5 May 1888 |
| RR/10/160 | Letter from James Joseph Sylvester, to John William Strutt, 3rd Baron Rayleigh, regarding a paper 'A class of functional invariants' by Andrew Russell Forsyth | 29 April 1888 |
| NLB/22 | New Letter Book volume 22, copy letters sent from Royal Society administration | 8 February 1901-2 August 1901 |
| RR/12/131 | Letter from Andrew Russell Forsyth, to John William Strutt, 3rd Baron Rayleigh, regarding a paper 'The differential covariants of twisted curves, with some illustrations of the application to quartic curves' by R F Gwyther | 7 November 1894 |
| RR/10/164 | Second letter from James Joseph Sylvester, to John William Strutt, 3rd Baron Rayleigh, regarding a paper 'A class of functional invariants' by Andrew Russell Forsyth | 12 June 1888 |
| RR/14/39 | Letter from Andrew Russell Forsyth, to Mr Harrison, regarding a paper 'Contributions to the theory of simultaneous partial differential equations' by Alfred Cardew Dixon | 1 May 1899 |
| RR/13/179 | Referee's report by Ernest William Hobson, on a paper 'Memoir on the integration of partial differential equations second order in three independent variables when an intermediary integral does not exist in general' by Andrew Russell Forsyth | 4 January 1898 |
| RR/9/345 | Second referee's report by Andrew Russell Forsyth, on a paper 'On the discrimination of maxima and minima solutions in the calculus of variations' by E P Culverwell | 1886 |
| RR/9/138 | Referee's report by Arthur Cayley, on a paper 'On Abel’s Theorem and Abelian functions' by Andrew Russell Forsyth | 20 February 1883 |
| RR/10/166 | Second referee's report by Arthur Cayley, on a paper 'A class of functional invariants' by Andrew Russell Forsyth | 31 October 1888 |
| RR/10/162 | Letter from Andrew Russell Forsyth, to John William Strutt, 3rd Baron Rayleigh, regarding a paper 'A class of functional invariants' by Andrew Russell Forsyth | 21 May 1888 |
| RR/10/167 | Letter from Alfred George Greenhill, to John William Strutt, 3rd Baron Rayleigh, regarding a paper 'A class of functional invariants' by Andrew Russell Forsyth | 17 November 1888 |
| RR/10/184 | Second referee's report by Andrew Russell Forsyth, on a paper 'On the direct application of first principles in the theory of partial differential equations' by Joseph Larmor | 1 March 1888 |
| RR/12/83 | Referee's report by Andrew Russell Forsyth, on a paper 'On the singular solutions of simultaneous ordinary differential equations and the theory of congruencies' by Alfred Cardew Dixon | 17 July 1894 |
| RR/12/195 | Letter from Andrew Russell Forsyth, to John William Strutt, 3rd Baron Rayleigh, regarding a paper 'A certain class of generating functions in the theory of numbers' by Percy Alexander MacMahon | 28 December 1893 |
| RR/14/34 | Referee's report by Andrew Russell Forsyth, on a paper 'Contributions to the theory of simultaneous partial differential equations' by Alfred Cardew Dixon | 6 January 1899 |
| RR/14/35 | Letter from Arthur William Rucker, to Andrew Russell Forsyth, regarding a paper 'Contributions to the theory of simultaneous partial differential equations' by Alfred Cardew Dixon | 10 January 1899 |
| RR/9/343 | Referee's report by Andrew Russell Forsyth, on a paper 'On the discrimination of maxima and minima solutions in the calculus of variations' by E P Culverwell | 1 September 1886 |
| AP/74/4 | Unpublished paper, 'Sets of operations in relation to groups of finite order' by A N [Alfred North] Whitehead | 1899 |
| NLB/20/655 | Copy letter from an unknown correspondent, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 13 June 1900 |
| RR/17/48 | Referee's report by Andrew Russell Forsyth, on a paper 'On the elliptic integral in electromagnetic theory' by Alfred George Greenhill | 23 January 1906 |
| RR/16/54 | Referee's report by Henry Frederick Baker, on a paper 'The differential invariants of space' by Andrew Russell Forsyth | August 1903 |
| RR/14/147 | Memorandum by Andrew Russell Forsyth, on a paper 'On simultaneous partial differential equations' by Alfred Cardew Dixon | 10 January 1900 |
| RR/10/159 | Referee's report by James Joseph Sylvester, on a paper 'A class of functional invariants' by Andrew Russell Forsyth | 28 April 1888 |
| RR/10/165 | Referee's report by Alfred George Greenhill, on a paper 'A class of functional invariants' by Andrew Russell Forsyth | 23 July 1888 |
| RR/10/181 | Referee's report by Andrew Russell Forsyth, on a paper 'On the direct application of first principles in the theory of partial differential equations' by Joseph Larmor | 5 January 1888 |
| RR/11/54 | Referee's report by Andrew Russell Forsyth, on a paper 'On the locus of singular points and lines which occur in connection the theory of the locus of ultimate intersections of a system of surfaces' by Micaiah John Muller Hill | 27 October 1891 |
| RR/11/262 | Referee's report by Andrew Russell Forsyth, on a paper 'On the differential covariants of plane curves, and the operators employed in their development' by R F Gwyther | 12 May 1893 |
| RR/12/129 | Referee's report by Andrew Russell Forsyth, on a paper 'The differential covariants of twisted curves, with some illustrations of the application to quartic curves' by R F Gwyther | 19 July 1894 |
| RR/13/227 | Letter from George Howard Darwin, on behalf of the Committee, on a paper 'A Maya calendar inscription, interpreted by Goodman's tables' by Alfred Percival Maudslay to the Secretary of the Royal Society | June 1897 |
| RR/14/104 | Referee's report by Andrew Russell Forsyth, on a paper 'On the connexion of algebraic functions with automorphic functions' by Edmund Taylor Whittaker | 2 May 1898 |
| RR/14/143 | Detailed referee's report by Andrew Russell Forsyth, on a paper 'On simultaneous partial differential equations' by Alfred Cardew Dixon | 2 October 1899 |
| RR/16/53 | Referee's report by William Burnside, on a paper 'The differential invariants of a surface, and their geometric significance' by Andrew Russell Forsyth | March 1903 |
| RR/16/55 | Referee's report by Edwin Bailey Elliott, on a paper 'The differential invariants of a surface, and their geometric significance' by Andrew Russell Forsyth | 12 March 1903 |
| NLB/15/641 | Copy letter from Arthur William Rucker, to Sir Fleetwood Isham Edwards, Privy Purse Office, Buckingham Palace, S.W. | 10 November 1897 |
| NLB/15/639 | Copy letter from Arthur William Rucker, to Professor Andrew Russell Forsyth, Fellow of the Royal Society | 9 November 1897 |
| MC/18/53 | Letter from [Andrew Russell] Forsyth, Trinity College, Cambridge, to [Robert William Frederick] Harrison | 24 June 1903 |
| MC/18/52 | Letter from [Andrew Russell] Forsyth, Trinity College, Cambridge, to [Robert William Frederick] Harrison | 17 June 1903 |
| MC/18/51 | Letter from [Andrew Russell] Forsyth, Trinity College, Cambridge, to [Robert William Frederick] Harrison | 4 March 1903 |
| NLB/18/368 | Copy letter from Robert William Frederick Harrison, to Professor Forsyth, Fellow of the Royal Society | 28 February 1899 |
| MC/17 | Volume 17 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1897-1899 |
| MC/20/35 | Letter from [Andrew Russell] Forsyth, Trinity College, Cambridge, to [Robert William Frederick] Harrison | 12 January 1905 |
| MC/21 | Volume 21 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1906 |
| MC/28/88 | Letter from [Andrew Russell] Forsyth, 41 The Manor House, Marylebone, N.W, to Mr [Robert] Harrison, [Royal Society] | 4 May 1913 |
| MC/21/210 | Letter from [Andrew Russell] Forsyth, Trinity College, Cambridge, to [Robert William Frederick] Harrison | 24 January 1906 |
| MC/18 | Volume 18 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1903 |
| MC/20 | Volume 20 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1905 |
| MC/30/59 | Letter from [Andrew Russell] Forsyth, 41 The Manor House, Marylebone, N.W, to Mr [Robert] Harrison, [Royal Society] | 21 June 1915 |
| MC/33/60 | Letter from [Andrew Russell] Forsyth, Imperial College of Science and Technology (Royal College of Science), South Kensington, London, S.W.7, to Mr [Robert] Harrison, [Royal Society] | 6 November 1918 |
| MC/34/71 | Letter from [Andrew Russell] Forsyth, Imperial College of Science and Technology (Royal College of Science), South Kensington, London, S.W. 7., to Mr [Robert] Harrison, [Royal Society] | 11 March 1919 |
| MC/34/72 | Letter from [Andrew Russell] Forsyth, 18 Hanover Terrace, Regents Park, N.W., to Mr [Robert] Harrison, [Royal Society] | 30 April 1919 |