'On some logical difficulties of language'

Unpublished copy. " Wants revision Jan 1 / 68" is written at the top of folio 2.

Open for research. At least 24 hours notice is required for research visits.

There is an interim handlist to the papers included in MS 238, MS 239, MS 240, MS 241, MS 775 and MS 776, prepared by T D Rogers in 1971. Also see A list of certain letters inserted in books from the Library of Augustus De Morgan (University of London Library, 1990).

There are various autograph letters written and received by Augustus de Morgan in the University of London Library. University College London holds correspondence and papers, 1827-1871 (Ref: MSS ADD 2-3, 5-7, 27, 69), correspondence with George Boole, [1842]-1864 (Ref: MS ADD 97), correspondence with Henry Peter Brougham, 1st Baron Brougham and Vaux (Ref: Brougham Papers), and letters to the Society for the Diffusion of Useful Knowledge, 1827-1844 (Ref: SDUK); the Royal Astronomical Society Library, London, has correspondence and papers, 1831-1866 (Ref: MSS de Morgan), and letters from De Morgan to the Society, 1831-1866 (Ref: RAS letters); the Royal Observatory Library, Edinburgh, contains a catalogue of mathematical books (Ref: NRA(S) 2657); the Bodleian Library, Oxford University, holds family correspondence (Ref: Dep Lovelace Byron), miscellaneous correspondence (Ref: MS Autogr d14), and correspondence with Anne Isabella Byron, Lady Byron (Ref: Dep Lovelace Byron); Cambridge University Library has correspondence with Sir George Biddell Airy, 1850-1870 (Ref: RGO MSS 942-52), letters to William Hepworth Dixon, 1856-1857 (Ref: Add 9428), and letters to William Thomson, Baron Kelvin, 1845-1849 (Ref: Add 7342, 7656); the British Library, London, contains correspondence with Charles Babbage, 1830-1850 (Ref: Add MSS 37185-200); the National Library of Scotland, Edinburgh, holds letters to Alexander Campbell Fraser, 1855-1864 (Ref: Dep 208); Edinburgh University Library has letters to James Orchard Halliwell-Phillipps, 1845-1851 (Ref: LOA); Trinity College, Dublin, contains letters to Sir William Rowan Hamilton, 1841-1865 (Ref: MS 1492); the Royal Society, London, holds correspondence with Sir John Frederick William Herschel, 1st Bt, 1831-1870 (Ref: HS), and letters to Sir John William Lubbock, 3rd Bt, 1832-1860 (Ref: LUB); Trinity College Library, Cambridge University, has letters to William Whewell, [1832]-1866 (Ref: Whewell MSS); the American Philosophical Society Library, Pennsylvania, USA, holds letters, 1841-1866 (Ref: NUC MS 76-902).