| RefNo | Title | Date |
| RR/21/106 | Referee's report by Frederick Gowland Hopkins, on a paper 'The excitatory process in the dog's heart. Part II.- The ventricles' by Thomas Lewis and M A Rothschild | [January 1915] |
| RR/19/77 | Referee's report by Francis Gotch, on a paper 'The human electrocardiogram: a preliminary investigation of young male adults, to form a basis for pathological study' by Thomas Lewis and M D D Gilder | [March 1912] |
| NLB/54/211 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Dr. [Thomas] Lewis, FRS; 1 Redington Road, Hampstead, N.W. | 5 March 1917 |
| NLB/54/375 | Copy letter from [Robert William Frederick Harrison, Assistant Secretary of the Royal Society]; to Dr. Thomas Lewis, FRS; 1 Redington Road, Hampstead, N.W. | 25 April 1917 |
| RR/19/78 | Referee's report by William Maddock Bayliss, on a paper 'The human electrocardiogram: a preliminary investigation of young male adults, to form a basis for pathological study' by Thomas Lewis and M D D Gilder | [March 1912] |
| NLB/54/410 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. [Thomas] Lewis, FRS; 1 Redington Road, Hampstead, N.W. | 5 May 1917 |
| RR/24/62 | Referee's report by William Maddock Bayliss, on the Croonian Lecture 'Upon the motion of the mammalian heart' by Thomas Lewis | [May 1917] |
| NLB/54/765 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. [Thomas] Lewis, FRS; 1 Redington Road, Hampstead, N.W. | 15 September 1917 |
| NLB/54/186 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Dr. [Thomas] Lewis, FRS; 1 Redington Road, Hampstead, N.W. | 26 February 1917 |
| RR/33/71 | Referee's report by Thomas Lewis, on a paper 'Rouget cells and their function' by Howard Walter Florey and H M Carelton | March 1926 |
| RR/33/72 | Referee's report by Thomas Lewis, on a paper 'Observations on the resolution of stasis in the finer blood vessels' by Howard Walter Florey | June 1926 |
| RR/32/78 | Referee's report by Thomas Lewis, on a paper 'The effect of light on the circulation' by D T Harris | August 1925 |
| RR/39/45 | Referee's report by Thomas Lewis, on a paper 'The delayed effects of pericardial removal' by H M Carleton | [May 1929] |
| RR/43/19 | Referee's report by Thomas Lewis, on a paper 'The vascular responses of the eye' by P M Duke-Elder and William Stewart Duke-Elder | June 1931 |
| RR/21/104 | Referee's report by Keith Lucas, on a paper 'The excitatory process in the dog’s heart. Part I. —The auricles' by Thomas Lewis, John Meakins and Paul D White | [July 1914] |
| RR/22/73 | Referee's report by Charles Scott Sherrington, on a paper 'The spread of the excitatory process in the vertebrate heart. Parts I-V' by Thomas Lewis | August 1915 |
| RR/22/72 | Referee's report by Arthur Robertson Cushny, on a paper 'The spread of the excitatory process in the vertebrate heart. Parts I-V' by Thomas Lewis | July 1915 |
| NLB/62/417 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Thomas Lewis, FRS | 11 February 1922 |
| RR/49/109 | Referee's report by Thomas Lewis, on a paper 'The rhythm of the heart beat. II—Disturbance of rhythm produced by late premature beats' by John Carew Eccles and H E Hoff | [September 1933] |
| RR/55/10 | Referee's report by Thomas Lewis, on a paper 'Respiratory variations of the heart rate - I—The reflex mechanism of the respiratory arrhythmia' by Gleb Anrep, W Pascual and R Rössler | October 1935 |
| NLB/67/949 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to F. Gill Esq.; International Western Electric Company, 63 Aldwych, W.C.2. | 22 April 1925 |
| NLB/64/470 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Sir Thomas Lewis, FRS | 20 April 1923 |
| NLB/68/700 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir John Rose Bradford, KCMG, FRS | 19 October 1925 |
| NLB/68/569 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir John Rose Bradford, KCMG, FRS | 10 August 1925 |
| NLB/69/215 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. H. Frederica, Liege, Belgium | 2 February 1926 |
| NLB/69/621 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [Thomas Renton] Elliott, FRS | 28 June 1926 |
| NLB/68/616 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr [Henry Hallett] Dale, CBE, FRS | 24 September 1925 |
| NLB/70/932 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Sir Thomas Lewis, FRS | 8 November 1927 |
| NLB/70/795 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Archibald Garrod, KCMG, FRS | 26 September 1927 |
| RR/35/32 | Referee's report by Thomas Lewis, on a paper 'The mammalian lacteal: its histological structure in relation to its physiological properties' by H M Carleton and Howard Walter Florey | July 1927 |
| NLB/73/287 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the Registrar, The University, Leeds. | 2 May 1931 |
| RR/22/74 | Referee's report by Arthur Robertson Cushny, on a paper 'The spread of the excitatory process in the vertebrate heart. Parts I-V' by Thomas Lewis | October 1915 |
| RR/22/75 | Referee's report by Charles Scott Sherrington, on a paper 'The spread of the excitatory process in the vertebrate heart. Parts I-V' by Thomas Lewis | October 1915 |
| RR/21/105 | Referee's report by Walter Holbrook Gaskell, on a paper 'The excitatory process in the dog’s heart. Part I. —The auricles' by Thomas Lewis, John Meakins and Paul D White | [August 1914] |
| EC/1918/17 | Lewis, Sir Thomas: certificate of election to the Royal Society | |
| NLB/54 | New Letter Book volume 54, copy letters sent from Royal Society administration | 10 January 1917-2 November 1917 |
| NLB/68/746 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to [William Cecil Dampier] Wetham Esq., FRS; also circulated to Sir James [Colquhoun] Irvine; Sir Thomas Lewis; Professor [John Charles Grant] Ledingham; Professor [James Peter] Hill; Professor [Edmund Johnston] Garwood; Professor [Frederick Alexander] Lindemann; [John Edensor] Littlewood Esq.; Sir [Robert] Robertson | 29 October 1925 |
| RR/21/107 | Referee's report by Arthur Robertson Cushny, on a paper 'The excitatory process in the dog's heart. Part II.- The ventricles' by Thomas Lewis and M A Rothschild | [January 1915] |
| RR/28/91 | Referee's report by Thomas Lewis, on a paper 'The influence of mechanical conditions of the circulation on the electrocardiogram' by Ivan de Burgh Daly | [April 1923] |
| RR/49/106 | Referee's report by Thomas Lewis, on a paper 'The rhythm of the heart beat. I—Location, action potential, and electrical excitability of the pacemaker' by John Carew Eccles and H E Hoff | [September 1933] |
| RR/54/140 | Referee's report by Thomas Lewis, on a paper 'Experimental pituitary basophilism' by Kenneth W Thompson and Harvey Williams Cushing | February 1934 |
| RR/54/141 | Referee's report by Arthur Edwin Boycott, on a paper 'Experimental pituitary basophilism' by Kenneth W Thompson and Harvey Williams Cushing | 20 February 1934 |