Records of Imperial College relating to the University of London, 1901-1989, including correspondence concerning syllabuses and examinations, 1901-1905; Principal's correspondence, 1910-1914; centenary celebrations, 1935; 150th anniversary, 1986; student accommodation, 1943-1944; Commissioners, 1927-1928; University of London Act and Statutes, 1926-1956; reports and proposed Act, 1975-1981; establishment of Imperial College as a University School, 1907-1908; correspondence with the Court concerning grants, 1930-1946; visitations and inspections, 1923-1985, including reports; papers relating to Quinquennial estimates, visits, developments and policy, 1946-1980, including Rector's papers, 1957-1969; academic plan, 1965-1970; governance of the university, notably Rector's correspondence, 1970-1983; reports, 1972-1982; Senate minutes, 1987-1989 (UL4-ULB);

Military Education Committee and Officers' Training Corps correspondence and papers, 1908-1958, including D Company roll book, 1927-1936; University Air Squadron correspondence, 1935-1939 (ULC); Conference and Committee papers on Engineering, and award of degrees, 1909-1926; correspondence concerning the recognition of Imperial College courses, 1945-1969; entrance and pass requirements for BSc degrees, 1954-1963; papers relating to postgraduate courses, 1961-1987 (ULG); correspondence relating to examinations and curricula, 1908-1934; student registration, 1952; confidential theses, 1940-1945 (ULH); Boathouse Committee papers, 1934-1947; University of London Students' Union ephemera, 1989 (ULM);
papers relating to the Nuclear Reactor Centre, Silwood Park, 1958-1980, notably opening, 1964-1965; purchase of the reactor, 1958-1965; Reactor Safety Committee, 1964-1974 (ULN);
papers concerning University Chairs and Readerships, 1908-1968, including regulations, 1922; correspondence concerning proposed Chairs and appointments, 1943-1968; Chairs tenable at Imperial College, 1943-1957; conferment of title of Professor and Readerships, 1931-1965; endowment of a Chair and Readership in Electrical Engineering, 1953-1958; applications for Assistant Professorships in Mining and Botany, 1908-1910 (ULO); papers concerning appointments to Chairs, with some papers concerning funding and administration for the Departments of Aeronautics, 1943-1975; Biochemistry, 1955-1979; Biology, 1952-1953; Botany including Biochemistry and Plant Physiology, 1936-1979; Chemical Engineering and Chemical Technology, 1935-1977; Analytical Chemistry, 1964-1975; Organic Chemistry, 1937-1978; Physical Chemistry, 1937-1977; Civil Engineering, 1945-1973; Computing and Control, 1974-1977; Electrical Engineering, 1944-1978; Geology, 1929-1975; Industrial Sociology, 1967-1978; Mathematics, 1946-1978; Mechanical Engineering, 1931-1978; Metallurgy, 1939-1976; Meteorology, 1933-1974; Mining, 1912-1980; Physics, 1937-1977; Zoology, 1930-1977 (ULP); appointments of readers in the Departments of Aeronautics and Aerodynamics, 1949-1972; Botany, 1942-1970; Chemical Engineering and Chemical Technology, 1932-1970; Inorganic and Physical Chemistry, 1937-1965; Organic Chemistry, 1944-1971; Civil Engineering, 1946-1977; Computing and Control, 1967-1968; Electrical Engineering, 1947-1965; Geology, 1936-1976; Mathematics, 1932-1977; Mechanical Engineering, 1936-1967; Metallurgy, 1937-1970; Meteorology, 1938-1970; Mining, 1950-1975; Physics, 1938-1970; Zoology, 1937-1970 (ULR);
correspondence concerning the recognition of college staff as teachers of the University, 1908-1949; establishment of the London Graduate School of Business Studies, 1963-1966; collaboration with Queen Elizabeth College, 1968-1981; with the Royal Postgraduate Medical School, 1968-1974; correspondence with Royal Holloway College, 1918-1974; with University College concerning a course on air navigation, 1936-1953 (UM).

Papers of Professor Albrecht Fröhlich, 1916-2001, reflecting his mathematical research, publications and correspondence with colleagues. Papers are divided into six sections comprising biographical papers; research papers; publications; papers relating to visits, conferences and lectures; correspondence and theses and examinations.

Biographical papers include obituaries, memoirs and papers relating to memorials including a service in the Chapel of Robinson College Cambridge, 10 Feb 2002; autobiographical papers including copy of Fröhlich's entry for Personal Records of Fellows of the Royal Society; papers relating to Fröhlich's career, honours and awards including his Ph.D. thesis 'On some topics in the theory of representation of groups and in class field theory', and correspondence and papers relating to his university appointments and some of his principal honours, including election to the Fellowship of the Royal Society.

Research papers chiefly comprise mathematical workings, notes and drafts: notably relating to work on the decomposition of primes [1950] and work on Galois module theory and Gauss sums.

Publications comprise published material by Fröhlich, 1950-2000, drafts and unpublished drafts, including work with Charles Terence Clegg Wall on Brauer groups, 'Galois modules and the functional equation', and draft of a longer text entitled 'mathematical theory of ostensive and consequently of empirical predicates'.

Visits, conferences and lectures include papers relating to Fröhlich's conference attendance and overseas visits 1956-1998, documentation of his participation in mathematics meetings held at the Mathematisches Forschungsinstitut, Oberwolfach, Germany and papers relating to Visiting Professorships, including invitations, programmes, and texts or abstracts of lectures.

Correspondence,1950-2000, on subjects including progress of Fröhlich's research, discussions of problems with mathematical workings and drafts of papers. Notable correspondents include Fröhlich's Ph.D. supervisor Hans Arnold Heilbronn, colleagues Jean-Pierre Serre, Olga Taussky-Todd, Stephen Virgil Ullom and Charles Terence Clegg Wall, and former research students Colin J. Bushnell, Martin J. Taylor and Stephen Mark Johnson Wilson.

Theses and examinations comprise, theses of Ph.D. students supervised or examined by Fröhlich, including his research students at King's College London and examination papers, some with Fröhlich's manuscript calculations of answers, 1980-1990.

Collection comprising three manuscript notebooks of theoretical problems relating to mechanics compiled by James Clerk Maxwell mainly during his employment at King's College London, including exam questions on aspects of mechanics and geometry, 1860-1865; problems on the collision of elastic spheres and the dynamic relation between other solid bodies; the refraction of light; the relationship between heat and volume in materials; attraction between particles, 1860-1873; notes on the works of leading authorities on mathematics and physics including Arthur Cayley, Franz Neumann and Siméon Poisson, 1867-1873; bibliography of textbooks mainly on mechanics, [1860-1865]; list of scientific instrument suppliers, [1860-1865]; outline of the contents of Maxwell's Treatise on electricity and magnetism (1873).

Augustus De Morgan's mathematical tracts, copied by John Power Hicks from the original manuscripts in the Library of University College London.

Notebooks on lectures on mathematics, languages and political economy attended by Bagehot when a student at University College London.

Correspondence between Augustus De Morgan and George Boole, Professor of Mathematics at Queen's College Cork, dated 1842-1864. The collection also includes letters from John Stuart Mill, and letters from various correspondents mostly dated 1846-1848.

Nine foolscap pages of handwritten mathematical calculations and notes by Arthur Cayley entitled 'Areal Co-ordinates' (December 1891)

In Arithmetica diversche questyen met hare solutien: door C.J. Broersz, liefhebber der Reeckenconst ... Tot Haarlem, Bij Gillis Rooman, woonende in de Jacobine-strate, in de vergulden Parsse, Anno 1590. The transcription of the book by Broersz occupies the first 33 leaves, and is signed F.[?] J. Riett, 1612. Ff. 35-88 contain further arithmetical problems, including some in verse form illustrated by pen-and-ink drawings.

34 letters from Francis William Newman, 1864-1894. 32 letters addressed to Newman's nephew John Rickards Mozley; 1 letter addressed to Newman's sister Jemima Mozley; 1 letter addressed to J R Mozley's father-in-law Bonamy Price. Topics covered include: domestic and family affairs; Newman's brother John Henry Newman (Cardinal Newman); education (including Augustus De Morgan and University College London); New Testament criticism; religion and morality; classical literature; mathematics; wealth; current affairs (including Irish Home Rule and the American Civil War); William Ewart Gladstone; and John Ruskin.

All items are autograph, with signatures.

Letters and papers relating to Gottfried von Leibnitz's claim to primacy over Sir Isaac Newton in the discovery of calculus. Including correspondence between H Sloman, William Hepworth Dixon (editor of The Athenaeum), W Metcalfe, Augustus De Morgan and a Mr de Fanget, 1861-1863. Many items are autograph and bear signatures.

Letter from Wililam Wallace to Rev George Peacock, Dean of Ely, [1833]. Describing Wallace's part in the introduction of foreign mathematical notation to England and 'the Reformation .... the the Mathematical science in Britain'.

Autograph, with signature. Headed 'First Copy'. Inscribed in another hand: 'Found among Mr Thomas Galloway's papers'.

Manuscript transcript by Richard Bateman, 1612, of a work by Benedictus Victorius Faventius containing a calculator or computer for increasing or diminishing figures, which was printed by Benedict Hector, bookseller of Bologna, in 1512. The text was copied by Bateman from a treatise of a revised edition by Dom. Gaetanus, Doctor of Medicine.

Manuscript arithmetic note-book, 1749, signed at the end 'E.Knight, August 1, 1749'. In a copper-plate hand, with many flourished initials and headings.

Notebook compiled by Jonathan Baker containing mathematical problems and tables, dated 29 July 1765. The notebook was also used for entering his accounts between 1782 and 1796, with some later, more general, additions to 1800, mostly relating to his work as a cobbler, but also accounts of household expenses and rents received. The accounts mention places between Cirencester and Newnham.

Manual of mathematics, including sections on calculating interest, 'brokage' and the purchase of stock, compiled by James Harrison of Leeds in 1775. At the end of the volume are added medical remedies and recipes in various hands, [1828].

A geometrical exercise book with Frederick's name and the dates 4 May 1795 and 17 May 1796 on the cover. Each page bears a theorem and its accompanying diagram, up to the 21st theorem of the 5th book. The exercises are occasionally relieved by a pencil sketch of a head or half-figure.

Draft of a paper entitled 'Sur une propriété générale d'une certaine classe de fonctions transcendantes (par Mr.N.H.Abel de Christiana)', apparently in the hand of Niels Henrik Abels hand, later printed as 'Remarques sur quelques propriétés generales d'une certaine sorte de fonctions transcendantes' in Oeuvres complètes de N.H.Abel...redigées...par B.Holmboe (1859), vol.I (section XV), pp.288-98.

Papers of Thomas Wilson, mid to late 18th century, comprising a volume containing notes by Wilson, of lectures given by John Hunter. Including notes on astronomical and mathematical topics, c 1854.

Papers of Jacob Vale Asbury, 1816-1843, comprising a manuscript volume by Asbury, containing notes of the lectures of John Abernethy given at St Bartholomew's, 25 Jul 1816; notes titled Observations on the Pulse, by Dr Fordyce, 18 Sep 1816; notes titled Lectures on the Principle Operations of Surgery by Sir Everard Home, 1812; notes titled Cases and Original Observations, 1842; tables of statistics on the population of Enfield, and Great Britain; and mathematical calculations on the cubic inches of water in a box.

Scientific and other papers sent to the Royal Society, presented at meetings of Fellows, or commissioned by the Society. They form a complementary series to the Early Letters, both of which were superseded by the Letters and Papers. Many of these items, referred to as the 'Guard Books', are duplicated in the Register Book of the Society. The classification is a simplified form of the 'Philosophical Transactions' abridgment by John Lowthorp. This arrangement was completed in 1741 by Thomas Birch. The majority of the papers in these volumes are manuscript, but a few printed documents occur throughout the series. Some of the papers are earlier in date than the grant on 15 July 1662 of the First Charter to the Society. The Committee of Trades seems to have been associated with the earlier meetings of those philosophers who subsequently became Fellows, and produced a number of practical papers, some of which were written in 1639 and which are mostly found in Volume 3(i). There are still earlier documents, mostly in Volume 25, which may have been included in the gift, in 1667, of the Arundel Library.

Some correspondence, papers, notebooks and publications of Sir James Hopwood Jeans. Early manuscripts in the series relate to Jean's education at Trinity College, Cambridge, in the form of early lecture notebooks, largely on mathematical topics. A collection of letters, 1901-1907, documents his treatment for tuberculosis at Ringwood Sanatorium, where he completed work on the theory of gases; correspondents included G H Hardy and Adam Sedgewick among others. Jean's engagements in popularizing science are represented by proofs and typescript of lectures and essays, especially those written for the BBC, 1934-1935, together with associated letters and press cuttings. The series contains collections of offprints, reprints, and extracts of published works by Jeans and others, notably from the Philosophical Transactions and the Philosophical Magazine.

The correspondence of Sir John William Lubbock, providing information on a wide range of Lubbock's contemporaries, not exclusively in the field of science. The largest collections of scientific letters are from George Biddell Airy (113 letters), John George Children (128 letters), Joshua Alwyn Compton, 2nd Marquis of Northampton (98 letters), G P D de Pontecoulant (67 letters) and William Whewell (87 letters). There are smaller but no less important groups of letters from Charles Babbage, Francis Baily, Francis Beaufort, Charles Darwin, John Couch Adams, J F W Herschel, Baden Powell and W H F Talbot.

Apollonii Conica methodo nova illustrata et succincte demonstrata per Isaacum Barrow, continet hoc volumen archetypon integrum editionis Londini 1675, in forma quarta, impressa.

Papers of the Gregory family, volume one includes writings by Sir Isaac Newton, friend of David Gregorie, Savilian Professor of Astronomy at Oxford, the volume is entitled 'Notae in Newtonii Principia Mathematica Philosophiae Naturalis' and his 'Theory of the Moon' which was incorporated in the 'Astronomia Physica' published by the Savilian Professor of Astronomy at Oxford; volume two is a volume of letters and papers of the Gregory family, including some papers of Sir Isaac Newton; David Gregorie of Kinnairdie; James Gregorie author of 'Optica Promota'; David Gregorie, Savilian Professor of Geometry at Oxford; James Gregorie Professor of Mathematics at Edinburgh; and Charles Gregory, Professor of Mathematics at Edinburgh University.

These are letters and papers of various members of the Gregory family including David Gregorie of Kinnairdie; James Gregory, author of Optical Promota; David Gregorie, Savillian Professor of Geometry at Oxford University; James Gregorie, Professor of Mathematics at Edinburgh University and Charles Gregory.

Latin translation attributed to Abelard of Bath, of Euclid's geometry ending imperfectly near the beginning of book 15 in the propsition 'intra propsitum cubum corpus habens iiij bases triangulas equalium laterum resignare'. Written in England

A commentary on Newton's 'Principia' by Nicholas Fatio, with an introductory note in English by Dr Johnstone about Fatio, his life, religious beliefs, death and dispersal of his books.

Two manuscripts by Louis Joel Mordell: 1. 'On the geometry of numbers in some non-convex regions' 60 pages, some manuscript corrections and 2. ' Hardy's mathematician, apology' review article 10 pages, photocopy.

A collection of letters to Abraham Sharp between the years 1701-2 and 1719.

Material collected by Thompson, 1825-1915, and removed from books within the S P Thompson Rare Books collection housed within IET Library. It comprises correspondence (1890-1915) from contemporary physicists and mathematicians such as David James Blaikley, Sir William Henry Blagg, Sir Charles Tilston Bright, Hugh Longbourne Callendar, Henry Smith Carhart, Sir John Ambrose Fleming, Sir Richard Tetley Glazebrook, Oliver Heaviside, Gisbert Kapp, Phillip Kelland, Sir Oliver Lodge, Sir William Henry Preece, Albion T. Snell, Sir William Spottiswoode, and William Thompson, Baron Kelvin; and press cuttings, photographs, engravings, autographs and letters (1870-1916) relating to eminent scientists including Sir Cristopher Wren, Sir Isaac Newton, James Watt, William Herschel, Sir John Flamsteed, Alexander Von Humboldt, Charles Darwin, Louis Pasteur, Sir Charles Lyell, William Gilbert, Otto von Guericke, Robert Boyle, Benjamin Franklin, Joseph Priestley, Alessandro Volta, Sir Humphry Davy, Michael Faraday, Sir Charles Wheatstone, James Clerk Maxwell, Josiah Latimer Clark, Werner von Siemens, Alexander Graham Bell, Sebastian Ziani de Ferranti, and many others.

Papers of Bernard Albert Hunn, 1949-[1982], relating to his career and research, including: copy of Hunn's degree certificate from King's College London, 1949; notes on elliptic functions, 1950; correspondence, 1951-1953, relating chiefly to the publication of scientific papers on aeronautics; reports from Hawker Aircraft Ltd design department, 1951-1953; technical papers and notes by Hunn, 1952-1956, relating to aeronautical mathematics; draft monograph by Hunn on 'Inertial guidance', 1964; correspondence, chiefly with James Allason, MP, concerning the British defence industry and world markets, 1964-1965; patent applications for 'improved guiding means for spinning missiles', 1959 and for a 'mind simulator' (an electronic model of the human mind), 1982, with essays and notes on the function of the human mind; photographs of a interlock relay system and of Revenue Systems component parts for a card payment system to be attached to a petrol pump; and memoir concerning Hunn's work in Nigeria, 1974-1978.

Note-books of William Dobinson Halliburton chiefly of lecture notes taken while a student at University College, London. Author's holograph MSS. Produced in London, 1874-1902.

Commonplace books of extracts and notes from works published mainly during the last quarter of the 17th century and early 18th century, relating to science, medicine and mathematics. Written mainly in Latin or Italian, but with some entries in French. Author's holograph MSS. Illustrated by numerous folding and other pen-drawn diagrams and figures, and a few wash-drawings. The numeration of the volumes has been added.

Vol. I In universam scientiam mechanicam institutiones (80 ll. 3 folding pen-and-wash drawings). II Optica. Catoptrica. Dioptrica (56 ll. 4 folding pen-drawings). III Extracts and notes mainly in Latin, but a few in French on medical, scientific, mathematical and philosophical works, mostly published between c 1685 and 1700: with notices of others on Church history and doctrine, Jansenists, etc. There is a long entry towards the end of the volume on the 'Medicina mentis' by Ehrenfried Walter von Tschirnhausen [1651-1708], (352 ll. 1 folding wash-drawing, 8 folding pen-drawings, wash-and pen-drawing in the text). IV A similar collection, but with a preponderance of entries in French, included in which is a long article under the title: 'La vie de demoiselle Antoinette Bourignon [1616-1680], écrite par elle-même [etc.]' Amsterdam. 1683. The date 1705 is found on the verso of the last leaf (312 ll., 5 folding pen-drawings, and a few marginal pen-drawn figures, etc.) V Notes and extracts on geometry, mechanics, optics, physics, etc. on Cartesian principles: in Italian and Latin. At the end is a long entry entitled: 'Fisica generale sopra il lume, ed i colori per il P. Mallebranche (i.e. Nicolas de Malebranche [1638-1715]) dall'Istoria dell'Accademia delle Scienze, 1699' (224 ll. 6 folding pen-drawings). VI Netwon (Sir I.). Optica: in Latin (160 ll. 11 folding pen-drawings and marginal pen-drawn figures, etc.). VII Extracts from Newton's works on astronomy: conics, mechanics, physics, etc.: in Latin (246 ll., 10 folding pen-drawn figures, etc.). VIII Extracts on astronomy, geography, geometry, and chronology: in Latin. Written in 1713 'in hoc anno'. An added note on the first page contains the date 1714 (208 ll. 8 folding pen-drawn figures, and marginal figures, 1 folding Table). IX Sanctorius (S.). Ex commentariis in Avicennam et in Aphoirismos Hippocratis (256 ll.). A note on 'Colica' in Aphorism XXV is dated 1716. X Extracts and notes from 17th cent. medical works, notes of cases, medical receipts, etc.: in Latin (196 ll.). Illustrated with a full-page pen-drawing of a male head. Against this Marmi has written: 'Exhibeo schema communicatum mihi ab excellentissimo D[octore] Schustonio [?] Practico Esslingense ... Elegantissime Burrhus eques Mediolani (i.e. Giuseppe Francesco Borri [1627-1695]) apud Tackium (Johann Tackius [1617-1675]) Phasis p. 160 uti Macrocosmi Compendium homo existimatur, ita homo sive humanus mundus in se quoque habet proprium compendium in vultu et imago nostri corporis est facies'. The illustration shows the facial nerves supposed to correspond with those of other parts of the body. XI A similar volume, mainly in Latin, but with some entries in Italian (318 ll.). There are long extracts and notes on the works of Galen and Hippocrates. A marginal note on the 6th leaf is dated Naples 1714: another entry on 'Aqua Tofana' is dated 1715 apparently at Naples.

Pasted down as end-papers at the beginning of Vol. IV is a small folio sheet containing an engraving of 'Triangulus australis' above a decorated wreath, which includes a small meallion-portrait of Werner XVII Comes de Hapsburgo. It is numbered 132, and is apparently extracted from an unidentified volume of engravings. The identification of the author of these MSS. is based on two entries. The first is in Vol. III is a marginal note on the verso of the 12th leaf of the entry of the 'Medicina mentis' of Tschirnhausen noted above. It begins: 'Mihi Jos. Herm. M[armi]. The expansion of 'Herm' into an Italian Christian name seems doubtful, but it could be 'Hermannus' or 'Herminius' or even 'Hermes' or 'Hermete'. The second entry is however decisive. It is found also in a marginal note on the eating of cucumbers in the summer, in connexion with the onset of bile after drinking in hot weather as observed by Galen. This is definitely signed 'I. H. Marmi'. Produced in Naples?

Papers of James Ware including notes for lectures on the eye and its disorders, notes on anatomy and mathematics, and a partnership indenture, 1760s-1780s.

Papers of Jean-Baptiste Biot, c 1800-1937, including correspondence and a translation of Biot's Memoir on the Circular Zodiac of Denderah.

Papers of George Macdonald dealing predominantly with the later stages of his career, 1938-1977, although there is some material relating to his pre-war activities. They reflect his work as an international figure in the prevention and control of malaria, his involvement with numerous governmental and non-governmental bodies, his relationship with colleagues, his numerous tours on professional business, and his research and writing.

Letter from Baldassarre Boncompagni-Ludovisi, 1858, [To Augustus De Morgan]. Thanking De Morgan for his letter of 14 November 1858, giving information about Francesco Galigai's 'Pratica d'Arithmetica' (1548), and asking for further details. Letter enquires about the library of Dr [Daniel Mitford] Peacock and asks De Morgan to get Count [Guglielmo] Libri to send catalogues of sales he was to hold [in March and August 1859] in England and in Paris. Enquires about further editions of De Morgan's 'Arithmetical Books' (1847) and offers to get one printed in Rome.

Letter from Michel Chasles of Paris to Augustus De Morgan, 8 Apr 1848. On algebraical formulae.

Autograph, with signature.

Papers of Hudson comprising 'Angle Generator for use in the study of trigonometry' by W B Bushell, 1873; a letter from H Orfleur concerning surfaces, with photograph of geometrical model attached, 1898; invitation to Hudson from Principal Henry Wace to the Medical Department Prize Distribution, with geometrical drawing on the reverse; mathematical model (quadratic surface: ellipsoid).

Papers of James Lighthill, 1970s-1990s including working papers; lecture notes and transcripts; conference papers; off prints of articles; drafts and proofs of publications by Lighthill; correspondence; personal awards and honours; papers relating to the Royal Society; audio cassettes and papers relating to the International Union of Theoretical and Applied Mechanics.

Undated mathematical fragments.

Notes on physics and mathematics.

Undated lecture notes on geometry: two closely written sheets pasted onto an otherwise unused notebook.

Twenty-three manuscript notebooks on mathematical statistics which include 'The theory of deviation from an average', the introduction to 'An algebra of evolution', and 'Problems relating to the mathematical treatment of statistics: periodicity and deviation'.

Manuscript of De Morgan's introductory lecture delivered at the opening of classes in mathematics at University College London on 5 November 1828. Appended are notes for another lecture.

Student's notes on lectures on Algebraic Geometry and the Calculus, given by Augustus De Morgan at University College London from 11 March to 13 May 1847.

Mathematical fragments, letters, and papers.

Manuscript volume, 17th century, containing: Mohammed Ibn Al-Hussain Karkhi, Kitab al-kafi fi 'ilm al-hisab wa-'ilm al-misahah wa-al-khawafi (Treatise on arithmetic, geometry, land surveying etc)

Arithmeticae et Astronomicae Auctores Varii: 15th century (possibly 1468) mathematical and astronomical treatises by various authors. Earlier texts written in Italy by one hand; others written by Heinrich Langenstein and Paul of Olmütz (?). Full page diagram of the zodiac on folio 47r.

Paper by Alexander J Ellis 'On clinant geometry, as a means of expressing the general relatings of points on a plane, realising imaginaries, and extending the theories of anharmonic ratios', communicated by Arthur Cayley, Esq. F.R.S. Febr. 1863. Abstract printed in the Proceedings of the Royal Society, vol.12, pp 442-3 Carbon copy of MS, with figures drawn in ink. Text and figures on rectos only. Paper wrappers inscribed 'Prof Augustus De Morgan, with the Author's respects'. Part of A De Morgan's library, given to the University by Lord Overstone in 1871. Former shelf-mark L(P.C.6).