| RefNo | Title | Date |
| EC/1926/19 | Lewis, William Cudmore McCullagh: certificate of election to the Royal Society | |
| IM/002738 | Lewis, William Cudmore McCullagh | nd |
| NLB/48/437 | Copy letter from Robert William Frederick Harrison, to [William Cudmore McCullagh] Lewis, Chemical Laboratory, University College | 4 July 1913 |
| RR/43/50 | Referee's report by William Cudmore McCullagh Lewis, on a paper 'The molecular statistics of an enzyme action' by John Burdon Sanderson Haldane | June 1931 |
| RR/60/18 | Referee's report by William Cudmore McCullagh Lewis, on a paper 'A theory of electrokinetic effects in solution; reactions between ions' by E A Moelwyn-Hughes | March 1936 |
| RR/53/83 | Referee's report by William Cudmore McCullagh Lewis, on a paper 'The sorption of vapours by ferric oxide gel. I. Aliphatic alcohols' by Alexander Graham Foster | [June 1934] |
| RR/55/27 | Referee's report by William Cudmore McCullagh Lewis, on a paper 'Acid catalysis in non-aqueous solvents. II. The rearrangement of N-bromacetanilide in chlorobenzene catalysed by trichloracetic acid' by R P Bell and R V H Levinge | May 1935 |
| RR/66/120 | Referee's report by Samuel Sugden, on a paper 'The effect of electrolytes upon the interfacial tension between water and dekalin (trans- decahydronaphthalene)' by W L Guest and William Cudmore Mccullagh Lewis | [March 1939] |
| RR/36/92 | Referee's report by William Cudmore McCullagh Lewis, on a paper 'The dielectric constants of ammonia, phosphine and arsine' by Herbert Edmeston Watson | [August 1927] |
| RR/57/17 | Referee's report by William Cudmore McCullagh Lewis, on a paper 'Studies on thixotropic gelation - II—The coagulation of clay suspensions' by J L Russell | 3 February 1936 |
| NLB/67/254 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Edward Charles Cyril] Baly, CBE, FRS | 21 November 1924 |
| NLB/70/522 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr [William Cudmore] McCullagh Lewis, FRS | 28 April 1927 |
| RR/47/55 | Referee's report by William Cudmore McCullagh Lewis, on a paper 'On the surface potentials of unimolecular films of ergosterol.— The photochemical formation of vitamin D' by Russel J Fosbinder | July 1932 |
| RR/60/19 | Referee's report by William Cudmore McCullagh Lewis, on a paper 'A theory of electro-kinetic effects in solution; reactions between ions and polar molecules' by E A Moelwyn-Hughes | 19 July 1936 |
| RR/73/102 | Letter from William Cudmore McCullagh Lewis, on a paper 'Kinetic salt effects on the inversion of sucrose' by Edward Armand Guggenheim and Leonard Albert Wiseman to D C Martin, Assistant Secretary of the Royal Society | 4 May 1950 |