| RefNo | Title | Date |
| EC/1911/25 | Rothschild, Lionel Walter: certificate of election to the Royal Society | |
| MS/499/7 | Letter from Lord Rothschild, New Court, St Swithin's Lane, to the Treasurer R[oyal] S[ociety] A.B.Kempe and copy of answer [19 December], confirming and detailing investment of Sylvester medal fund | 16 December 1898 |
| MS/499/20 | Letter from Lord Rothschild, New Court, St. Swithin's Lane to A.B. Kempe regarding the investment of the Sylvester medal fund. | 4 April 1900 |
| MS/499/15 | Letter from Lord Rothschild, New Court, St Swithin's Lane to A.B.Kempe regarding investments on account of the Sylvester memorial fund | 14 February 1900 |
| MS/499/13 | Letter from Lord Rothschild, New Court, St Swithan's Lane, to A.B. Kempe agreeing to provision of a deed of trust for the Sylvester medal fund. | 13 December 1899 |
| MS/499/22 | Letter from Lord Rothschild, New Court, St Swithin's Lane, to A.B. Kempe, accompanying a cheque for the balance of the Sylvester medal fund. | 9 April 1900 |
| IM/003897 | Rothschild, Lionel Walter, 2nd Baron Rothschild | nd |
| NLB/19/758 | Copy letter from Alfred Bray Kempe, to Lord Rothschild, New Court, St Swithin's Lane, E.C. | 12 December 1899 |
| NLB/20/177 | Copy letter from Robert William Frederick Harrison, to Lord Lionel Walter Rothschild, [Fellow of the Royal Society], New Court, St Swithin's Lane, E.C. | 19 February 1900 |
| NLB/20/616 | Copy letter from Robert William Frederick Harrison, to Lord [Lionel Walter] Rothschild, New Court, St Swithin's Lane, E.C. | 2 June 1900 |
| NLB/21/40 | Copy letter from Alfred Bray Kempe, to Lord [Lionerl Walter] Rothschild | 20 July 1900 |
| NLB/21/414 | Copy letter from Robert William Frederick Harrison, to Lord [Lionel Walter] Rothschild, New Court, St Swithin's Lane, E.C. | 13 November 1900 |
| NLB/21/707 | Copy letter from Alfred Bray Kempe, to Lord [Lionel Walter] Rothschild, [Fellow of the Royal Society], New Court, St Swithin's Lane, E.C. | 12 January 1901 |
| RR/67/240 | Report notes by unknown referee, on a paper 'Spontaneous rhythmical impedance changes in the trout’s egg' by M J Hubbard and Lionel Walter Rothschild | 1939 |
| NLB/64/224 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the Lord Rothschild [Lionel Walter Rothschild], FRS | 23 February 1923 |
| NLB/20/180 | Copy letter from Robert William Frederick Harrison, to Messrs Few & Company, 19 Surrey Street, Strand, W.C. | 19 February 1900 |
| NLB/21/666 | Copy letter from Alfred Bray Kempe, to Lord Lionel Walter Rothschild, [Fellow of the Royal Society], New Court, St Swithin's Lane, E.C. | 8 January 1901 |
| RR/65/158 | Referee's report by Otto Heinrich Warburg, on a paper 'The metabolism of the eggs of Psammechinus miliaris during the fertilization reaction' by H Laser and Lionel Walter Rothschild | September 1938 |