| Reference number | Title | Date |
| EC/1895/11 | Hickson, Sydney John: certificate of election to the Royal Society | |
| IM/Maull/002086 | Hickson, Sydney John | nd |
| NLB/1/733 | Copy letter from Herbert Rix, to Sydney John Hickson, Downing College, Cambridge | 19 November 1887 |
| NLB/7/770 | Copy letter from Herbert Rix, to Professor Joseph Prestwich, Fellow of the Royal Society | 24 April 1893 |
| NLB/20/577 | Copy letter from Robert William Frederick Harrison, to Dr Sydney J Hickson | 24 May 1900 |
| NLB/11/278 | Copy letter from Herbert Rix, to Professor Michael Foster | 23 May 1895 |
| NLB/28/413 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, The Owens College, Manchester | 3 March 1904 |
| NLB/11/276 | Copy letter from Michael Foster, to the Secretary, Science and Art Department, South Kensington, S.W. | 24 May 1895 |
| NLB/11/331 | Copy letter from Herbert Rix, to Dr Sydney John Hickson, Ellesmere House, Wilmslow Road, Fallowfield, Manchester | 5 June 1895 |
| NLB/14/703 | Copy letter from an unknown correspondent, to Messrs Harrison & Sons | 30 April 1897 |
| NLB/13/594 | Copy letter from Theodore E James, to [Messrs Harrison & Sons] | 13 October 1896 |
| NLB/13/633 | Copy letter from Robert William Frederick Harrison, to Professor Sydney Johnson Hickson, Fellow of the Royal Society | 22 October 1896 |
| NLB/38 | New Letter Book volume 38, copy letters sent from Royal Society administration | 1 June 1908-12 November 1908 |
| NLB/37 | New Letter Book volume 37, copy letters sent from Royal Society administration | 10 January 1908-1 June 1908 |
| NLB/16/166 | Copy letter from Robert William Frederick Harrison, to Professor Hickson | 15 February 1898 |
| RR/15/368 | Referee's report by Sydney John Hickson, on a paper 'The development of echinus esculentus together with some points in the development of E. Miliaris and E. Acutus' by Ernest William MacBride | May 1902 |
| RR/16/288 | Referee's report by Sydney John Hickson, on two papers 'A biometrical study of conjugation in paramecium' by Raymond Pearl and 'The growth of the oocyte in antedon: A morphological study in the cell-metabolism' by Gilbert C Chubb | 8 May 1906 |
| NLB/16/165 | Copy letter from Theodore E James, to Messrs Harrison & Sons | [15 February 1898] |
| NLB/20/302 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 16 March 1900 |
| NLB/52/342 | Copy letter from [Robert William Frederick Harrison, Assistant Secretary of the Royal Society]; to Professor Sydney John Hickson, FRS | 12 November 1915 |
| NLB/19/670 | Copy letter from Robert William Frederick Harrison, to Professor Edwin Ray Lankester, Fellow of the Royal Society | 21 November 1899 |
| NLB/20/57 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 23 January 1900 |
| NLB/20/593 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 26 May 1900 |
| NLB/24/617 | Copy letter from Robert William Frederick Harrison, to Professor [Sydney John] Hickson, Fellow of the Royal Society | 9 June 1902 |
| NLB/37/745 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney] J [John] Hickson | 7 May 1908 |
| NLB/36/388 | Copy letter from A H White, to Professor Sydney John Hickson, Ellesmere House, Washington, Manchester | 24 October 1907 |
| NLB/27/678 | Copy letter from Robert William Frederick Harrison, to Professor Sydney Johnson Hickson, Fellow of the Royal Society | 13 November 1903 |
| NLB/24/601 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 6 June 1902 |
| NLB/36/226 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 24 September 1907 |
| NLB/27/127 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 7 July 1903 |
| NLB/26/655 | Copy letter from Robert William Frederick Harrison to, Professor Sydney John Hickson, Fellow of the Royal Society | 6 May 1903 |
| NLB/29/257 | Copy letter from Theodore E James, to Professor Sydney John Hickson, Fellow of the Royal Society | 24 August 1904 |
| NLB/38/34 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 4 June 1908 |
| NLB/27/867 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 15 December 1903 |
| NLB/34/612 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 15 February 1907 |
| NLB/32/328 | Copy letter from Sir Archibald Geikie, to Professor Walter Frank Raphael Weldon, [Fellow of the Royal Society] | 21 February 1906 |
| NLB/32/399 | Copy letter from Robert William Frederick Harrison, to Professor Walter Frank Raphael Weldon, Fellow of the Royal Society, Chairman of the Zoology Sectional Committee | 5 March 1906 |
| NLB/33/122 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, Manchester | 2 July 1906 |
| NLB/32/457 | Copy letter from Robert William Frederick Harrison, to Professor Walter Frank Raphael Weldon, Fellow of the Royal Society, Chairman of the Zoology Committee | 13 March 1906 |
| NLB/33/152 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 6 July 1906 |
| NLB/34/34 | Copy letter from Theodore E James, to Richard Threlfall, Fellow of the Royal Society, George Forbes, Fellow of the Royal Society, Sydney John Hickson, Fellow of the Royal Society | 20 November 1906 |
| NLB/33/580 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, Chairman of the Zoology Committee | 3 October 1906 |
| NLB/32/737 | Copy letter from Archibald Geikie, to Professor Sydney John Hickson, Fellow of the Royal Society, Ellesmere House, Withington, Manchester | 18 May 1906 |
| NLB/33/610 | Copy letter from Robert William Frederick Harrison, to Professor Sydney Johnson Hickson, Fellow of the Royal Society | 8 October 1906 |
| NLB/33/872 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, Chairman of the Zoology Sectional Committee | 15 November 1906 |
| NLB/32/801 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 28 May 1906 |
| NLB/35/315 | Copy letter from Robert William Frederick Harrison, to Francis Darwin, Secretary, Royal Society | 14 May 1907 |
| NLB/35/487 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, Chairman of the Zoology Sectional Committee | 5 June 1907 |
| NLB/35/486 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, Chairman of the Zoology Committee | 4 June 1907 |
| NLB/35/672 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Chairman of the Zoology Sectional Committee | 1 July 1907 |
| NLB/35/714 | Copy letter from Archibald Geikie, to Professor Sydney John Hickson, Fellow of the Royal Society | 9 July 1907 |
| NLB/38/61 | Copy letter from Theodore E James, to Professor [Sydney John] Hickson, Fellow of the Royal Society, Ellesmere House, Withington, Manchester | [June 1908] |
| NLB/37/193 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney John] Hickson FRS | 13 February 1908 |
| NLB/38/69 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 12 June 1908 |
| NLB/36/740 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 10 December 1907 |
| NLB/37/63 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney] J [John] Hickson FRS | 17 January 1908 |
| NLB/37/71 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney John] Hickson FRS | 20 January 1908 |
| NLB/37/173 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney] J [John] Hickson, Chairman of the Zoology Sectional Committee | 7 February 1908 |
| NLB/37/48 | Copy letter from Robert William Frederick Harrison to Professor [Sydney John] Hickson FRS, Chairman of the Sectional Committee for Zoology | 16 January 1908 |
| NLB/37/358 | Copy letter from Robert William Frederick Harrison to Professor S [Sidney John] Hickson, Fellow of the Royal Society | 7 March 1908 |
| NLB/37/304 | Copy letter from Robert William Frederick Harrison to Professor J [John] Hickson, Fellow of the Royal Society, Chairman of the Zoology Sectional Committee. | 28 February 1908 |
| NLB/37/714 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney John] Hickson, Fellow of the Royal Society | 4 May 1908 |
| NLB/37/360 | Copy letter from Robert William Frederick Harrison to Professor [Sidney] J [John] Hickson, Fellow of the Royal Society | 7 March 1908 |
| NLB/37/461 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney John] Hickson, Fellow of the Royal Society | 24 March 1908 |
| NLB/37/406 | Copy letter from Robert William Frederick Harrison to Professor S [Sidney] J [John] Hickson, Fellow of the Royal Society, Chairman of the Zoology Sectional Committee | 14 March 1908 |
| NLB/37/883 | Copy Letter from Archibald Geikie to Professor [Sydney John] Hickson | 29 May 1908 |
| NLB/37/699 | Copy letter from Robert William Frederick Harrison to Sir Archibald Geikie, KCB, Fellow of the Royal Society, Secretary of the Royal Society | 4 May 1908 |
| NLB/37/686 | Copy letter from Archibald Geikie to Professor [Sydney John] Hickson | 1 May 1908 |
| NLB/38/142 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 19 June 1908 |
| NLB/37/710 | Copy letter from Robert William Frederick Harrison to C G Hewitt | 5 May 1908 |
| NLB/39/231 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney] J [John] Hickson, Fellow of the Royal Society | 15 December 1908 |
| NLB/38/226 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, Chairman of the Zoology Sectional Committee | 2 July 1908 |
| NLB/38/304 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, Chairman of the Zoology Sectional Committee | 13 July 1908 |
| NLB/39/430 | Copy letter from Robert William Frederick Harrison to Professor [Sidney Frederick] Harmer, Fellow of the Royal Society | 21 January 1909 |
| NLB/38/480 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 10 August 1908 |
| NLB/38/542 | Copy letter from Joseph Larmor and Sir Archibald Geikie, to Henry Frederick Baker, Fellow of the Royal Society, and others | 16 September 1908 |
| NLB/38/601 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 7 October 1908 |
| NLB/38/771 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 5 November 1908 |
| NLB/38/816 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 10 November 1908 |
| NLB/44/140 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney] J [John] Hickson FRS | 16 May 1911 |
| NLB/43/632 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 28 February 1911 |
| NLB/44/279 | Copy letter from John Rose Bradford to Professor [Sydney John] Hickson | 6 June 1911 |
| NLB/43/532 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 3 February 1911 |
| NLB/43/579 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 15 February 1911 |
| NLB/43/627 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 27 February 1911 |
| NLB/43/641 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 1 March 1911 |
| NLB/45/249 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney] J [John] Hickson FRS | 26 January 1912 |
| NLB/53/308 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Sydney John] Hickson, FRS | 06 July 1916 |
| NLB/45/496 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney] J [John] Hickson FRS | 15 March 1912 |
| NLB/47/331 | Copy letter from Robert William Frederick Harrison to Professor S [Sidney] J [John] Hickson FRS, the University, Manchester | 17 January 1913 |
| NLB/52/295 | Copy letter from [Robert William Frederick Harrison, Assistant Secretary of the Royal Society]; to Professor Sydney John Hickson, FRS | 3 November 1915 |
| RR/16/133 | Referee's report by Sydney John Hickson, on a paper 'The oocyte of Tomopteris' by Mr Wallace | 25 July 1903 |
| RR/20/161 | Referee's report by Sydney John Hickson, on a paper 'On a remarkable new type of protistan parasite' by H M Woodcock and G Lapage | 7 June 1913 |
| NLB/52/602 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor Sydney John Hickson, FRS | 27 January 1916 |
| NLB/52/894 | Copy letter from William Bate Hardy, Vice President of the Royal Society; to Professor Sydney John Hickson, FRS; Ellesmere House, Withington, Manchester | 7 March 1916 |
| RR/19/90 | Referee's report by Sydney John Hickson, on a paper 'A note on the protozoa from sick soils, with some account of the life-cycle of a flagellate monad' by C H Martin | [May 1912] |
| NLB/53/296 | Copy letter from [William Bate] Hardy, Secretary of the Royal Society and FRS; to Professor [Sydney John] Hickson, FRS | 30 June 1916 |
| NLB/53/146 | Copy letter from [William Bate] Hardy, Secretary of the Royal Society and FRS; to Professor [Sydney John] Hickson, FRS | 9 May 1916 |
| NLB/54/195 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Sydney John] Hickson, FRS | 1 March 1917 |
| NLB/53/162 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Sydney John] Hickson, FRS | 12 May 1916 |
| NLB/53/255 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Sydney John] Hickson, FRS | 15 June 1916 |
| RR/9/149 | Referee's report by Edward Albert Sharpey-Schafer, on a paper 'On the ciliated groove (siphonoglyphe) in the stomodaeum of the alcyonarians' by Sydney John Hickson | 12 June 1883 |
| RR/13/89 | Referee's report by Sydney Hickson, on a paper 'Microscopic and systematic study of madreporarian types of corals' by Maria M Ogilvie | 3 October 1895 |
| RR/17/193 | Referee's report by Sydney John Hickson, on a paper 'Some points in the development of Ophiothrix fragilis' by Ernest William MacBride | [May 1907] |
| RR/12/355 | Referee's report by Sydney John Hickson, on a paper 'The development of Asterina gibbosa' by Ernest William MacBride | 27 May 1895 |
| RR/12/363 | Referee's report by Sydney John Hickson, on a paper 'On the origin of the triradiate spicules of Leucosolenia' by Edward Alfred Minchin | 11 June 1895 |
| RR/14/163 | Referee's report by Sydney John Hickson, on a paper 'Polytremacis and the ancestry of Helioporidae' by John Walter Gregory | nd [December 1899] |
| NLB/67/139 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Sydney John] Hickson, FRS | 1 November 1924 |
| RR/14/252 | Referee's report by Sydney John Hickson, on a paper 'Upon the development of the enamel in certain osseous fish' by Charles Sissmore Tomes | nd [January 1900] |
| RR/39/23 | Referee's report by Sydney John Hickson, on a paper 'Studies in tunicate development. Part I.— General physiology development of simple Ascidians' by Norman John Berrill | [February 1929] |
| RR/30/66 | Referee's report by Sydney John Hickson, on a paper 'Colony-formation in astroeid corals' by [George] Matthai | [October 1924] |
| NLB/68/315 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Sydney John] Hickson, FRS | 19 June 1925 |
| NLB/70/661 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Sydney John] Hickson, FRS | 21 June 1927 |
| NLB/69/837 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [Sydney John] Hickson FRS | 29 October 1926 |
| NLB/70/553 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Sydney John] Hickson, FRS | 17 May 1927 |
| NLB/70/412 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Sydney John] Hickson, FRS | 25 March 1927 |
| NLB/11/571 | Copy letter from Herbert Rix, to Dr Sydney John Hickson, Fellow of the Royal Society | 25 July 1895 |
| NLB/16/349 | Copy letter from Michael Foster, to Professor Sydney J Hickson, Fellow of the Royal Society | 21 March 1898 |
| NLB/33/251 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, Ellesmere House, Withington | 23 July 1906 |
| NLB/33/716 | Copy letter from Robert William Frederick Harrison, to; Augustus Desire Waller, Lord Avebury [John Lubbock], Sir Benjamin Baker, Dr Henry Frederick Baker, Professor David Ferrier, Professor Sydney John Hickson, Dr A Scott, Mr Albert Charles Seward, Professor William Johnson Sollas, and Professor Silvanus Phillips Thompson, Fellows of the Royal Society | 26 October 1906 |
| NLB/36/173 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, Chairman of the Zoology Sectional Committee | 30 August 1907 |
| NLB/35/822 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 19 July 1907 |
| NLB/36/557 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 14 November 1907 |
| NLB/37/385 | Copy letter from Archibald Geikie to Professor [Sydney John] Hickson | 11 March 1908 |
| NLB/39/171 | Copy letter from Robert William Frederick Harrison to Professor S [Sydney] J [John] Hickson, Fellow of the Royal Society, Chairman of the Zoology Sectional Committee | 4 December 1908 |
| NLB/38/334 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society, Chairman of the Zoology Sectional Committee | 16 July 1908 |
| NLB/38/632 | Copy letter from Archibald Geikie, to Professor Sydney John Hickson, Fellow of the Royal Society | 14 October 1908 |
| RR/23/60 | Referee's report by Sydney John Hickson, on a paper 'Colony-formation in astrœid corals' by G Matthai | 12 September 1916 |
| RR/25/13 | Referee's report by Sydney John Hickson, on a paper 'The development of the sea-anemones Metridium dianthus (Ellis) and Adamsia palliata (Bohad)' by James Fairlie Gemmill | [June 1918] |
| RR/16/286 | Referee's report by Sydney John Hickson, on a paper 'The growth of the oocyte in antedon: A morphological study in the cell-metabolism' by Gilbert C Chubb | March 1906 |
| NLB/24/659 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 14 June 1902 |
| NLB/32/509 | Copy letter from Robert William Frederick Harrison, to Professor Walter Frank Raphael Weldon, Fellow of the Royal Society, Chairman of the Zoology Sectional Committee | 22 March 1906 |
| NLB/35/782 | Copy letter from Robert William Frederick Harrison, to Professor Sydney John Hickson, Fellow of the Royal Society | 16 July 1907 |
| RR/10/179 | Referee's report by Adam Sedgwick, on a paper 'On the sexual cells and the early stages in the development of Millepora plicata' by Sydney John Hickson | 30 December 1887 |
| NLB/52 | New Letter Book volume 52, copy letters sent from Royal Society administration | 9 July 1915-8 March 1916 |
| RR/9/164 | Referee's report by Edwin Ray Lankester, on three papers; 'On the structure and functions of the eyes of arthropoda' by B Thompson Lowne, 'Observations on the colouring-matters of the so-called bile of invertebrates, on those of the bile of vertebrates, and on some unusual urine pigments' by Charles A MacMunn and 'On the ciliated groove (siphonoglyphe) in the stomodaeum of the alcyonarians' by Sydney John Hickson | 31 May 1883 |
| RR/10/180 | Second referee's report by Edwin Ray Lankester, on a paper 'On the sexual cells and the early stages in the development of Millepora plicata' by Sydney John Hickson | 26 January 1888 |
| RR/14/253 | Detailed referee's report by Sydney John Hickson, on a paper 'Upon the development of the enamel in certain osseous fish' by Charles Sissmore Tomes | 3 January 1900 |
| RR/17/35 | Committee report to Sydney John Hickson, on a paper 'On the development of the head-muscles of the common fowl (Gallus domesticus), together with some remarks on the head-muscles of reptiles' by F H Edgeworth, and a letter from F H Edgeworth | 5 October 1906 |
| PP/8/21 | Paper, 'Notes upon a new Alcyonarian' by S J [Sydney John] Hickson | 1886 |
| RR/16/356 | Referee's report by Sydney John Hickson, on a paper 'A biometrical study of conjugation in paramaecium' by Raymond Pearl | April 1906 |
| RR/10/178 | Referee's report by Edwin Ray Lankester, on two papers 'On the sexual cells and the early stages in the development of Millepora plicata' by Sydney John Hickson and 'A contribution to the study of the comparative anatomy of flowers' by G Henslow | 28 December 1887 |
| MC/14/218 | Letter from Sydney [Jonh] Hickson, Downing College, Cambridge, to [Michael] Foster | 6 June 1887 |
| MC/14 | Volume 14 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1885-1888 |
| NLB/18/7 | Copy letter from Michael Foster, to Professor Sydney J Hickson, Fellow of the Royal Society | 21 December 1898 |